Merge pull request #4284 from taosdata/feature/query

Feature/query

src/client/inc/tscSubquery.h

@@ -39,9 +39,9 @@ int32_t tscHandleMultivnodeInsert(SSqlObj *pSql);
 int32_t tscHandleInsertRetry(SSqlObj* pSql);
 
 void tscBuildResFromSubqueries(SSqlObj *pSql);
-TAOS_ROW doSetResultRowData(SSqlObj *pSql, bool finalResult);
+TAOS_ROW doSetResultRowData(SSqlObj *pSql);
 
-char *getArithemicInputSrc(void *param, const char *name, int32_t colId);
+char *getArithmeticInputSrc(void *param, const char *name, int32_t colId);
 
 #ifdef __cplusplus
 }

src/client/inc/tsclient.h

@@ -313,6 +313,7 @@ typedef struct {
   SResRec *             pGroupRec;
   char *                data;
   TAOS_ROW              tsrow;
+  TAOS_ROW              urow;
   int32_t*              length;  // length for each field for current row
   char **               buffer;  // Buffer used to put multibytes encoded using unicode (wchar_t)
   SColumnIndex *        pColumnIndex;
@@ -425,6 +426,7 @@ int32_t tscTansformSQLFuncForSTableQuery(SQueryInfo *pQueryInfo);
 void    tscRestoreSQLFuncForSTableQuery(SQueryInfo *pQueryInfo);
 
 int32_t tscCreateResPointerInfo(SSqlRes *pRes, SQueryInfo *pQueryInfo);
+void tscSetResRawPtr(SSqlRes* pRes, SQueryInfo* pQueryInfo);
 
 void tscResetSqlCmdObj(SSqlCmd *pCmd, bool removeFromCache);
 
@@ -471,8 +473,9 @@ static FORCE_INLINE void tscGetResultColumnChr(SSqlRes* pRes, SFieldInfo* pField
   int32_t bytes = pInfo->field.bytes;
 
   char* pData = pRes->data + (int32_t)(offset * pRes->numOfRows + bytes * pRes->row);
+  UNUSED(pData);
 
-  // user defined constant value output columns
+//   user defined constant value output columns
   if (pInfo->pSqlExpr != NULL && TSDB_COL_IS_UD_COL(pInfo->pSqlExpr->colInfo.flag)) {
     if (type == TSDB_DATA_TYPE_NCHAR || type == TSDB_DATA_TYPE_BINARY) {
       pData = pInfo->pSqlExpr->param[1].pz;

src/client/jni/com_taosdata_jdbc_TSDBJNIConnector.h

@@ -129,6 +129,14 @@ JNIEXPORT jint JNICALL Java_com_taosdata_jdbc_TSDBJNIConnector_getSchemaMetaData
 JNIEXPORT jint JNICALL Java_com_taosdata_jdbc_TSDBJNIConnector_fetchRowImp
   (JNIEnv *, jobject, jlong, jlong, jobject);
 
+/*
+ * Class:     com_taosdata_jdbc_TSDBJNIConnector
+ * Method:    fetchBlockImp
+ * Signature: (JJLcom/taosdata/jdbc/TSDBResultSetBlockData;)I
+ */
+JNIEXPORT jint JNICALL Java_com_taosdata_jdbc_TSDBJNIConnector_fetchBlockImp
+  (JNIEnv *, jobject, jlong, jlong, jobject);
+
 /*
  * Class:     com_taosdata_jdbc_TSDBJNIConnector
  * Method:    closeConnectionImp

src/client/src/TSDBJNIConnector.c

@@ -17,7 +17,6 @@
 #include "taos.h"
 #include "tlog.h"
 #include "tscUtil.h"
-#include "tsclient.h"
 
 #include "com_taosdata_jdbc_TSDBJNIConnector.h"
 
@@ -57,6 +56,10 @@ jmethodID g_rowdataSetStringFp;
 jmethodID g_rowdataSetTimestampFp;
 jmethodID g_rowdataSetByteArrayFp;
 
+jmethodID g_blockdataSetByteArrayFp;
+jmethodID g_blockdataSetNumOfRowsFp;
+jmethodID g_blockdataSetNumOfColsFp;
+
 #define JNI_SUCCESS          0
 #define JNI_TDENGINE_ERROR  -1
 #define JNI_CONNECTION_NULL -2
@@ -66,7 +69,7 @@ jmethodID g_rowdataSetByteArrayFp;
 #define JNI_FETCH_END       -6
 #define JNI_OUT_OF_MEMORY   -7
 
-void jniGetGlobalMethod(JNIEnv *env) {
+static void jniGetGlobalMethod(JNIEnv *env) {
   // make sure init function executed once
   switch (atomic_val_compare_exchange_32(&__init, 0, 1)) {
     case 0:
@@ -114,10 +117,31 @@ void jniGetGlobalMethod(JNIEnv *env) {
   g_rowdataSetByteArrayFp = (*env)->GetMethodID(env, g_rowdataClass, "setByteArray", "(I[B)V");
   (*env)->DeleteLocalRef(env, rowdataClass);
 
+  jclass blockdataClass = (*env)->FindClass(env, "com/taosdata/jdbc/TSDBResultSetBlockData");
+  jclass g_blockdataClass = (*env)->NewGlobalRef(env, blockdataClass);
+  g_blockdataSetByteArrayFp = (*env)->GetMethodID(env, g_blockdataClass, "setByteArray", "(II[B)V");
+  g_blockdataSetNumOfRowsFp = (*env)->GetMethodID(env, g_blockdataClass, "setNumOfRows", "(I)V");
+  g_blockdataSetNumOfColsFp = (*env)->GetMethodID(env, g_blockdataClass, "setNumOfCols", "(I)V");
+  (*env)->DeleteLocalRef(env, blockdataClass);
+
   atomic_store_32(&__init, 2);
   jniDebug("native method register finished");
 }
 
+static int32_t check_for_params(jobject jobj, jlong conn, jlong res) {
+  if ((TAOS*) conn == NULL) {
+    jniError("jobj:%p, connection is closed", jobj);
+    return JNI_CONNECTION_NULL;
+  }
+
+  if ((TAOS_RES *) res == NULL) {
+    jniError("jobj:%p, conn:%p, res is null", jobj, (TAOS*) conn);
+    return JNI_RESULT_SET_NULL;
+  }
+
+  return JNI_SUCCESS;
+}
+
 JNIEXPORT void JNICALL Java_com_taosdata_jdbc_TSDBJNIConnector_setAllocModeImp(JNIEnv *env, jobject jobj, jint jMode,
                                                                                jstring jPath, jboolean jAutoDump) {
   if (jPath != NULL) {
@@ -194,37 +218,35 @@ JNIEXPORT jlong JNICALL Java_com_taosdata_jdbc_TSDBJNIConnector_connectImp(JNIEn
                                                                            jstring jpass) {
   jlong       ret  = 0;
   const char *host = NULL;
-  const char *dbname = NULL;
   const char *user = NULL;
   const char *pass = NULL;
+  const char *dbname = NULL;
 
   if (jhost != NULL) {
     host = (*env)->GetStringUTFChars(env, jhost, NULL);
   }
+
   if (jdbName != NULL) {
     dbname = (*env)->GetStringUTFChars(env, jdbName, NULL);
   }
+
   if (juser != NULL) {
     user = (*env)->GetStringUTFChars(env, juser, NULL);
   }
+
   if (jpass != NULL) {
     pass = (*env)->GetStringUTFChars(env, jpass, NULL);
   }
 
   if (user == NULL) {
-    jniDebug("jobj:%p, user is null, use default user %s", jobj, TSDB_DEFAULT_USER);
+    jniDebug("jobj:%p, user not specified, use default user %s", jobj, TSDB_DEFAULT_USER);
   }
+
   if (pass == NULL) {
-    jniDebug("jobj:%p, pass is null, use default password", jobj);
+    jniDebug("jobj:%p, pass not specified, use default password", jobj);
   }
 
-  /*
-   * set numOfThreadsPerCore = 0
-   * means only one thread for client side scheduler
-   */
-  tsNumOfThreadsPerCore = 0.0;
-
-  ret = (jlong)taos_connect((char *)host, (char *)user, (char *)pass, (char *)dbname, (uint16_t)jport);
+  ret = (jlong) taos_connect((char *)host, (char *)user, (char *)pass, (char *)dbname, (uint16_t)jport);
   if (ret == 0) {
     jniError("jobj:%p, conn:%p, connect to database failed, host=%s, user=%s, dbname=%s, port=%d", jobj, (void *)ret,
              (char *)host, (char *)user, (char *)dbname, (int32_t)jport);
@@ -233,10 +255,21 @@ JNIEXPORT jlong JNICALL Java_com_taosdata_jdbc_TSDBJNIConnector_connectImp(JNIEn
              (char *)host, (char *)user, (char *)dbname, (int32_t)jport);
   }
 
-  if (host != NULL) (*env)->ReleaseStringUTFChars(env, jhost, host);
-  if (dbname != NULL) (*env)->ReleaseStringUTFChars(env, jdbName, dbname);
-  if (user != NULL) (*env)->ReleaseStringUTFChars(env, juser, user);
-  if (pass != NULL) (*env)->ReleaseStringUTFChars(env, jpass, pass);
+  if (host != NULL) {
+    (*env)->ReleaseStringUTFChars(env, jhost, host);
+  }
+
+  if (dbname != NULL) {
+    (*env)->ReleaseStringUTFChars(env, jdbName, dbname);
+  }
+
+  if (user != NULL) {
+    (*env)->ReleaseStringUTFChars(env, juser, user);
+  }
+
+  if (pass != NULL) {
+    (*env)->ReleaseStringUTFChars(env, jpass, pass);
+  }
 
   return ret;
 }
@@ -245,64 +278,53 @@ JNIEXPORT jlong JNICALL Java_com_taosdata_jdbc_TSDBJNIConnector_executeQueryImp(
                                                                                 jbyteArray jsql, jlong con) {
   TAOS *tscon = (TAOS *)con;
   if (tscon == NULL) {
-    jniError("jobj:%p, connection is already closed", jobj);
+    jniError("jobj:%p, connection already closed", jobj);
     return JNI_CONNECTION_NULL;
   }
 
   if (jsql == NULL) {
-    jniError("jobj:%p, conn:%p, sql is null", jobj, tscon);
+    jniError("jobj:%p, conn:%p, empty sql string", jobj, tscon);
     return JNI_SQL_NULL;
   }
 
   jsize len = (*env)->GetArrayLength(env, jsql);
 
-  char *dst = (char *)calloc(1, sizeof(char) * (len + 1));
-  if (dst == NULL) {
-    jniError("jobj:%p, conn:%p, can not alloc memory", jobj, tscon);
+  char *str = (char *) calloc(1, sizeof(char) * (len + 1));
+  if (str == NULL) {
+    jniError("jobj:%p, conn:%p, alloc memory failed", jobj, tscon);
     return JNI_OUT_OF_MEMORY;
   }
 
-  (*env)->GetByteArrayRegion(env, jsql, 0, len, (jbyte *)dst);
+  (*env)->GetByteArrayRegion(env, jsql, 0, len, (jbyte *)str);
   if ((*env)->ExceptionCheck(env)) {
     // todo handle error
   }
 
-  jniDebug("jobj:%p, conn:%p, sql:%s", jobj, tscon, dst);
-
-  SSqlObj *pSql = taos_query(tscon, dst);
+  SSqlObj *pSql = taos_query(tscon, str);
   int32_t  code = taos_errno(pSql);
 
   if (code != TSDB_CODE_SUCCESS) {
     jniError("jobj:%p, conn:%p, code:%s, msg:%s", jobj, tscon, tstrerror(code), taos_errstr(pSql));
   } else {
-    int32_t affectRows = 0;
     if (pSql->cmd.command == TSDB_SQL_INSERT) {
-      affectRows = taos_affected_rows(pSql);
+      int32_t affectRows = taos_affected_rows(pSql);
       jniDebug("jobj:%p, conn:%p, code:%s, affect rows:%d", jobj, tscon, tstrerror(code), affectRows);
     } else {
       jniDebug("jobj:%p, conn:%p, code:%s", jobj, tscon, tstrerror(code));
     }
   }
 
-  free(dst);
-  return (jlong)pSql;
+  free(str);
+  return (jlong) pSql;
 }
 
 JNIEXPORT jint JNICALL Java_com_taosdata_jdbc_TSDBJNIConnector_getErrCodeImp(JNIEnv *env, jobject jobj, jlong con, jlong tres) {
-  TAOS *tscon = (TAOS *)con;
-  if (tscon == NULL) {
-    jniError("jobj:%p, connection is closed", jobj);
-    return (jint)TSDB_CODE_TSC_INVALID_CONNECTION;
-  }
-
-  if ((void *)tres == NULL) {
-    jniError("jobj:%p, conn:%p, resultset is null", jobj, tscon);
-    return JNI_RESULT_SET_NULL;
+  int32_t code = check_for_params(jobj, con, tres);
+  if (code != JNI_SUCCESS) {
+    return code;
   }
 
-  TAOS_RES *pSql = (TAOS_RES *)tres;
-
-  return (jint)taos_errno(pSql);
+  return (jint)taos_errno((TAOS_RES*) tres);
 }
 
 JNIEXPORT jstring JNICALL Java_com_taosdata_jdbc_TSDBJNIConnector_getErrMsgImp(JNIEnv *env, jobject jobj, jlong tres) {
@@ -313,23 +335,16 @@ JNIEXPORT jstring JNICALL Java_com_taosdata_jdbc_TSDBJNIConnector_getErrMsgImp(J
 JNIEXPORT jlong JNICALL Java_com_taosdata_jdbc_TSDBJNIConnector_getResultSetImp(JNIEnv *env, jobject jobj, jlong con,
                                                                                 jlong tres) {
   TAOS *tscon = (TAOS *)con;
-  if (tscon == NULL) {
-    jniError("jobj:%p, connection is closed", jobj);
-    return JNI_CONNECTION_NULL;
-  }
-
-  if ((void *)tres == NULL) {
-    jniError("jobj:%p, conn:%p, resultset is null", jobj, tscon);
-    return JNI_RESULT_SET_NULL;
+  int32_t code = check_for_params(jobj, con, tres);
+  if (code != JNI_SUCCESS) {
+    return code;
   }
 
   SSqlObj *pSql = (TAOS_RES *)tres;
-  STscObj *pObj = pSql->pTscObj;
-
   if (tscIsUpdateQuery(pSql)) {
-    jniDebug("jobj:%p, conn:%p, update query, no resultset, %p", jobj, pObj, (void *)tres);
+    jniDebug("jobj:%p, conn:%p, update query, no resultset, %p", jobj, tscon, (void *)tres);
   } else {
-    jniDebug("jobj:%p, conn:%p, get resultset, %p", jobj, pObj, (void *)tres);
+    jniDebug("jobj:%p, conn:%p, get resultset, %p", jobj, tscon, (void *)tres);
   }
 
   return tres;
@@ -337,15 +352,9 @@ JNIEXPORT jlong JNICALL Java_com_taosdata_jdbc_TSDBJNIConnector_getResultSetImp(
 
 JNIEXPORT jint JNICALL Java_com_taosdata_jdbc_TSDBJNIConnector_isUpdateQueryImp(JNIEnv *env, jobject jobj, jlong con,
                                                                                 jlong tres) {
-  TAOS *tscon = (TAOS *)con;
-  if (tscon == NULL) {
-    jniError("jobj:%p, connection is closed", jobj);
-    return JNI_CONNECTION_NULL;
-  }
-
-  if ((void *)tres == NULL) {
-    jniError("jobj:%p, conn:%p, resultset is null", jobj, tscon);
-    return JNI_RESULT_SET_NULL;
+  int32_t code = check_for_params(jobj, con, tres);
+  if (code != JNI_SUCCESS) {
+    return code;
   }
 
   SSqlObj *pSql = (TAOS_RES *)tres;
@@ -355,37 +364,27 @@ JNIEXPORT jint JNICALL Java_com_taosdata_jdbc_TSDBJNIConnector_isUpdateQueryImp(
 
 JNIEXPORT jint JNICALL Java_com_taosdata_jdbc_TSDBJNIConnector_freeResultSetImp(JNIEnv *env, jobject jobj, jlong con,
                                                                                 jlong res) {
-  TAOS *tscon = (TAOS *)con;
-  if (tscon == NULL) {
-    jniError("jobj:%p, connection is closed", jobj);
-    return JNI_CONNECTION_NULL;
-  }
-
-  if ((void *)res == NULL) {
-    jniError("jobj:%p, conn:%p, resultset is null", jobj, tscon);
-    return JNI_RESULT_SET_NULL;
+  int32_t code = check_for_params(jobj, con, res);
+  if (code != JNI_SUCCESS) {
+    return code;
   }
 
   taos_free_result((void *)res);
-  jniDebug("jobj:%p, conn:%p, free resultset:%p", jobj, tscon, (void *)res);
+  jniDebug("jobj:%p, conn:%p, free resultset:%p", jobj, (TAOS*) con, (void *)res);
+
   return JNI_SUCCESS;
 }
 
 JNIEXPORT jint JNICALL Java_com_taosdata_jdbc_TSDBJNIConnector_getAffectedRowsImp(JNIEnv *env, jobject jobj, jlong con,
                                                                                   jlong res) {
   TAOS *tscon = (TAOS *)con;
-  if (tscon == NULL) {
-    jniError("jobj:%p, connection is closed", jobj);
-    return JNI_CONNECTION_NULL;
-  }
-
-  if ((void *)res == NULL) {
-    jniError("jobj:%p, conn:%p, resultset is null", jobj, tscon);
-    return JNI_RESULT_SET_NULL;
+  int32_t code = check_for_params(jobj, con, res);
+  if (code != JNI_SUCCESS) {
+    return code;
   }
 
   jint ret = taos_affected_rows((SSqlObj *)res);
-  jniDebug("jobj:%p, conn:%p, sql:%p, res: %p, affect rows:%d", jobj, tscon, (void *)con, (void *)res, (int32_t)ret);
+  jniDebug("jobj:%p, conn:%p, sql:%p, res: %p, affect rows:%d", jobj, tscon, (TAOS *)con, (TAOS_RES *)res, (int32_t)ret);
 
   return ret;
 }
@@ -394,27 +393,20 @@ JNIEXPORT jint JNICALL Java_com_taosdata_jdbc_TSDBJNIConnector_getSchemaMetaData
                                                                                     jlong con, jlong res,
                                                                                     jobject arrayListObj) {
   TAOS *tscon = (TAOS *)con;
-  if (tscon == NULL) {
-    jniError("jobj:%p, connection is closed", jobj);
-    return JNI_CONNECTION_NULL;
-  }
-
-  TAOS_RES *result = (TAOS_RES *)res;
-  if (result == NULL) {
-    jniError("jobj:%p, conn:%p, resultset is null", jobj, tscon);
-    return JNI_RESULT_SET_NULL;
+  int32_t code = check_for_params(jobj, con, res);
+  if (code != JNI_SUCCESS) {
+    return code;
   }
 
-  TAOS_FIELD *fields = taos_fetch_fields(result);
-  int         num_fields = taos_num_fields(result);
-
-  // jobject arrayListObj = (*env)->NewObject(env, g_arrayListClass, g_arrayListConstructFp, "");
+  TAOS_RES* tres = (TAOS_RES*) res;
+  TAOS_FIELD *fields = taos_fetch_fields(tres);
 
+  int32_t num_fields = taos_num_fields(tres);
   if (num_fields == 0) {
-    jniError("jobj:%p, conn:%p, resultset:%p, fields size is %d", jobj, tscon, (void *)res, num_fields);
+    jniError("jobj:%p, conn:%p, resultset:%p, fields size is %d", jobj, tscon, tres, num_fields);
     return JNI_NUM_OF_FIELDS_0;
   } else {
-    jniDebug("jobj:%p, conn:%p, resultset:%p, fields size is %d", jobj, tscon, (void *)res, num_fields);
+    jniDebug("jobj:%p, conn:%p, resultset:%p, fields size is %d", jobj, tscon, tres, num_fields);
     for (int i = 0; i < num_fields; ++i) {
       jobject metadataObj = (*env)->NewObject(env, g_metadataClass, g_metadataConstructFp);
       (*env)->SetIntField(env, metadataObj, g_metadataColtypeField, fields[i].type);
@@ -457,21 +449,21 @@ JNIEXPORT jint JNICALL Java_com_taosdata_jdbc_TSDBJNIConnector_fetchRowImp(JNIEn
   }
 
   TAOS_FIELD *fields = taos_fetch_fields(result);
-  int         num_fields = taos_num_fields(result);
 
-  if (num_fields == 0) {
-    jniError("jobj:%p, conn:%p, resultset:%p, fields size is %d", jobj, tscon, (void*)res, num_fields);
+  int32_t numOfFields = taos_num_fields(result);
+  if (numOfFields == 0) {
+    jniError("jobj:%p, conn:%p, resultset:%p, fields size %d", jobj, tscon, (void*)res, numOfFields);
     return JNI_NUM_OF_FIELDS_0;
   }
 
   TAOS_ROW row = taos_fetch_row(result);
   if (row == NULL) {
-    int tserrno = taos_errno(result);
-    if (tserrno == 0) {
-      jniDebug("jobj:%p, conn:%p, resultset:%p, fields size is %d, fetch row to the end", jobj, tscon, (void*)res, num_fields);
+    int code = taos_errno(result);
+    if (code == TSDB_CODE_SUCCESS) {
+      jniDebug("jobj:%p, conn:%p, resultset:%p, fields size is %d, fetch row to the end", jobj, tscon, (void*)res, numOfFields);
       return JNI_FETCH_END;
     } else {
-      jniDebug("jobj:%p, conn:%p, interruptted query", jobj, tscon);
+      jniDebug("jobj:%p, conn:%p, interrupted query", jobj, tscon);
       return JNI_RESULT_SET_NULL;
     }
   }
@@ -480,7 +472,7 @@ JNIEXPORT jint JNICALL Java_com_taosdata_jdbc_TSDBJNIConnector_fetchRowImp(JNIEn
 
   char tmp[TSDB_MAX_BYTES_PER_ROW] = {0};
 
-  for (int i = 0; i < num_fields; i++) {
+  for (int i = 0; i < numOfFields; i++) {
     if (row[i] == NULL) {
       continue;
     }
@@ -534,6 +526,45 @@ JNIEXPORT jint JNICALL Java_com_taosdata_jdbc_TSDBJNIConnector_fetchRowImp(JNIEn
   return JNI_SUCCESS;
 }
 
+JNIEXPORT jint JNICALL Java_com_taosdata_jdbc_TSDBJNIConnector_fetchBlockImp(JNIEnv *env, jobject jobj, jlong con,
+                                                                           jlong res, jobject rowobj) {
+  TAOS *  tscon = (TAOS *)con;
+  int32_t code = check_for_params(jobj, con, res);
+  if (code != JNI_SUCCESS) {
+    return code;
+  }
+
+  TAOS_RES *  tres = (TAOS_RES *)res;
+  TAOS_FIELD *fields = taos_fetch_fields(tres);
+
+  int32_t numOfFields = taos_num_fields(tres);
+  assert(numOfFields > 0);
+
+  TAOS_ROW row = NULL;
+  int32_t  numOfRows = taos_fetch_block(tres, &row);
+  if (numOfRows == 0) {
+    code = taos_errno(tres);
+    if (code == JNI_SUCCESS) {
+      jniDebug("jobj:%p, conn:%p, resultset:%p, numOfFields:%d, no data to retrieve", jobj, tscon, (void *)res,
+               numOfFields);
+      return JNI_FETCH_END;
+    } else {
+      jniDebug("jobj:%p, conn:%p, query interrupted", jobj, tscon);
+      return JNI_RESULT_SET_NULL;
+    }
+  }
+
+  (*env)->CallVoidMethod(env, rowobj, g_blockdataSetNumOfRowsFp, (jint)numOfRows);
+  (*env)->CallVoidMethod(env, rowobj, g_blockdataSetNumOfColsFp, (jint)numOfFields);
+
+  for (int i = 0; i < numOfFields; i++) {
+    (*env)->CallVoidMethod(env, rowobj, g_blockdataSetByteArrayFp, i, fields[i].bytes * numOfRows,
+                           jniFromNCharToByteArray(env, (char *)row[i], fields[i].bytes * numOfRows));
+  }
+
+  return JNI_SUCCESS;
+}
+
 JNIEXPORT jint JNICALL Java_com_taosdata_jdbc_TSDBJNIConnector_closeConnectionImp(JNIEnv *env, jobject jobj,
                                                                                   jlong con) {
   TAOS *tscon = (TAOS *)con;
@@ -589,7 +620,6 @@ JNIEXPORT jlong JNICALL Java_com_taosdata_jdbc_TSDBJNIConnector_consumeImp(JNIEn
   jniGetGlobalMethod(env);
 
   TAOS_SUB *tsub = (TAOS_SUB *)sub;
-
   TAOS_RES *res = taos_consume(tsub);
 
   if (res == NULL) {
@@ -621,16 +651,16 @@ JNIEXPORT jint JNICALL Java_com_taosdata_jdbc_TSDBJNIConnector_validateCreateTab
 
   jsize len = (*env)->GetArrayLength(env, jsql);
 
-  char *dst = (char *)calloc(1, sizeof(char) * (len + 1));
-  (*env)->GetByteArrayRegion(env, jsql, 0, len, (jbyte *)dst);
+  char *str = (char *)calloc(1, sizeof(char) * (len + 1));
+  (*env)->GetByteArrayRegion(env, jsql, 0, len, (jbyte *)str);
   if ((*env)->ExceptionCheck(env)) {
     // todo handle error
   }
 
-  int code = taos_validate_sql(tscon, dst);
+  int code = taos_validate_sql(tscon, str);
   jniDebug("jobj:%p, conn:%p, code is %d", jobj, tscon, code);
 
-  free(dst);
+  free(str);
   return code;
 }
 

src/client/src/tscLocal.c

@@ -341,7 +341,7 @@ TAOS_ROW tscFetchRow(void *param) {
     return NULL;
   }
 
-  void* data = doSetResultRowData(pSql, true);
+  void* data = doSetResultRowData(pSql);
 
   tscClearSqlOwner(pSql);
   return data;

src/client/src/tscLocalMerge.c

@@ -1651,7 +1651,7 @@ int32_t doArithmeticCalculate(SQueryInfo* pQueryInfo, tFilePage* pOutput, int32_
     // calculate the result from several other columns
     if (pSup->pArithExprInfo != NULL) {
       arithSup.pArithExpr = pSup->pArithExprInfo;
-      tExprTreeCalcTraverse(arithSup.pArithExpr->pExpr, (int32_t) pOutput->num, pbuf + pOutput->num*offset, &arithSup, TSDB_ORDER_ASC, getArithemicInputSrc);
+      tExprTreeCalcTraverse(arithSup.pArithExpr->pExpr, (int32_t) pOutput->num, pbuf + pOutput->num*offset, &arithSup, TSDB_ORDER_ASC, getArithmeticInputSrc);
     } else {
       SSqlExpr* pExpr = pSup->pSqlExpr;
       memcpy(pbuf + pOutput->num * offset, pExpr->offset * pOutput->num + pOutput->data, pExpr->resBytes * pOutput->num);

src/client/src/tscServer.c

@@ -1439,19 +1439,6 @@ int tscBuildRetrieveFromMgmtMsg(SSqlObj *pSql, SSqlInfo *pInfo) {
   return TSDB_CODE_SUCCESS;
 }
 
-static int tscSetResultPointer(SQueryInfo *pQueryInfo, SSqlRes *pRes) {
-  if (tscCreateResPointerInfo(pRes, pQueryInfo) != TSDB_CODE_SUCCESS) {
-    return pRes->code;
-  }
-
-  for (int i = 0; i < pQueryInfo->fieldsInfo.numOfOutput; ++i) {
-    int16_t offset = tscFieldInfoGetOffset(pQueryInfo, i);
-    pRes->tsrow[i] = (unsigned char*)((char*) pRes->data + offset * pRes->numOfRows);
-  }
-
-  return 0;
-}
-
 /*
  * this function can only be called once.
  * by using pRes->rspType to denote its status
@@ -1462,15 +1449,18 @@ static int tscLocalResultCommonBuilder(SSqlObj *pSql, int32_t numOfRes) {
   SSqlRes *pRes = &pSql->res;
   SSqlCmd *pCmd = &pSql->cmd;
 
-  SQueryInfo *pQueryInfo = tscGetQueryInfoDetail(pCmd, pCmd->clauseIndex);
-
   pRes->code = TSDB_CODE_SUCCESS;
   if (pRes->rspType == 0) {
     pRes->numOfRows = numOfRes;
     pRes->row = 0;
     pRes->rspType = 1;
 
-    tscSetResultPointer(pQueryInfo, pRes);
+    SQueryInfo *pQueryInfo = tscGetQueryInfoDetail(pCmd, pCmd->clauseIndex);
+    if (tscCreateResPointerInfo(pRes, pQueryInfo) != TSDB_CODE_SUCCESS) {
+      return pRes->code;
+    }
+
+    tscSetResRawPtr(pRes, pQueryInfo);
   } else {
     tscResetForNextRetrieve(pRes);
   }
@@ -1514,10 +1504,11 @@ int tscProcessRetrieveLocalMergeRsp(SSqlObj *pSql) {
   }
 
   pRes->code = tscDoLocalMerge(pSql);
-  SQueryInfo *pQueryInfo = tscGetQueryInfoDetail(pCmd, pCmd->clauseIndex);
 
   if (pRes->code == TSDB_CODE_SUCCESS && pRes->numOfRows > 0) {
+    SQueryInfo *pQueryInfo = tscGetQueryInfoDetail(pCmd, pCmd->clauseIndex);
     tscCreateResPointerInfo(pRes, pQueryInfo);
+    tscSetResRawPtr(pRes, pQueryInfo);
   }
 
   pRes->row = 0;
@@ -2198,6 +2189,15 @@ int tscProcessRetrieveRspFromNode(SSqlObj *pSql) {
     return pRes->code;
   }
 
+  STableMetaInfo *pTableMetaInfo = tscGetMetaInfo(pQueryInfo, 0);
+  if (pCmd->command == TSDB_SQL_RETRIEVE) {
+    tscSetResRawPtr(pRes, pQueryInfo);
+  } else if ((UTIL_TABLE_IS_CHILD_TABLE(pTableMetaInfo) || UTIL_TABLE_IS_NORMAL_TABLE(pTableMetaInfo)) && !TSDB_QUERY_HAS_TYPE(pQueryInfo->type, TSDB_QUERY_TYPE_SUBQUERY)) {
+    tscSetResRawPtr(pRes, pQueryInfo);
+  } else if (tscNonOrderedProjectionQueryOnSTable(pQueryInfo, 0) && !TSDB_QUERY_HAS_TYPE(pQueryInfo->type, TSDB_QUERY_TYPE_JOIN_QUERY) && !TSDB_QUERY_HAS_TYPE(pQueryInfo->type, TSDB_QUERY_TYPE_JOIN_SEC_STAGE)) {
+    tscSetResRawPtr(pRes, pQueryInfo);
+  }
+
   if (pSql->pSubscription != NULL) {
     int32_t numOfCols = pQueryInfo->fieldsInfo.numOfOutput;
     

src/client/src/tscSql.c

@@ -489,6 +489,27 @@ int taos_fetch_block_impl(TAOS_RES *res, TAOS_ROW *rows) {
   return (int)((pQueryInfo->order.order == TSDB_ORDER_DESC) ? pRes->numOfRows : -pRes->numOfRows);
 }
 
+static bool needToFetchNewBlock(SSqlObj* pSql) {
+  SSqlRes *pRes = &pSql->res;
+  SSqlCmd *pCmd = &pSql->cmd;
+
+  return (pRes->completed != true || hasMoreVnodesToTry(pSql) || hasMoreClauseToTry(pSql)) &&
+         (pCmd->command == TSDB_SQL_RETRIEVE ||
+          pCmd->command == TSDB_SQL_RETRIEVE_LOCALMERGE ||
+          pCmd->command == TSDB_SQL_TABLE_JOIN_RETRIEVE ||
+          pCmd->command == TSDB_SQL_FETCH ||
+          pCmd->command == TSDB_SQL_SHOW ||
+          pCmd->command == TSDB_SQL_SHOW_CREATE_TABLE ||
+          pCmd->command == TSDB_SQL_SHOW_CREATE_DATABASE ||
+          pCmd->command == TSDB_SQL_SELECT ||
+          pCmd->command == TSDB_SQL_DESCRIBE_TABLE ||
+          pCmd->command == TSDB_SQL_SERV_STATUS ||
+          pCmd->command == TSDB_SQL_CURRENT_DB ||
+          pCmd->command == TSDB_SQL_SERV_VERSION ||
+          pCmd->command == TSDB_SQL_CLI_VERSION ||
+          pCmd->command == TSDB_SQL_CURRENT_USER);
+}
+
 TAOS_ROW taos_fetch_row(TAOS_RES *res) {
   SSqlObj *pSql = (SSqlObj *)res;
   if (pSql == NULL || pSql->signature != pSql) {
@@ -509,77 +530,50 @@ TAOS_ROW taos_fetch_row(TAOS_RES *res) {
   // set the sql object owner
   tscSetSqlOwner(pSql);
 
-  // current data set are exhausted, fetch more data from node
-  if (pRes->row >= pRes->numOfRows && (pRes->completed != true || hasMoreVnodesToTry(pSql) || hasMoreClauseToTry(pSql)) &&
-      (pCmd->command == TSDB_SQL_RETRIEVE ||
-       pCmd->command == TSDB_SQL_RETRIEVE_LOCALMERGE ||
-       pCmd->command == TSDB_SQL_TABLE_JOIN_RETRIEVE ||
-       pCmd->command == TSDB_SQL_FETCH ||
-       pCmd->command == TSDB_SQL_SHOW ||
-       pCmd->command == TSDB_SQL_SHOW_CREATE_TABLE ||
-       pCmd->command == TSDB_SQL_SHOW_CREATE_DATABASE ||
-       pCmd->command == TSDB_SQL_SELECT ||
-       pCmd->command == TSDB_SQL_DESCRIBE_TABLE ||
-       pCmd->command == TSDB_SQL_SERV_STATUS ||
-       pCmd->command == TSDB_SQL_CURRENT_DB ||
-       pCmd->command == TSDB_SQL_SERV_VERSION ||
-       pCmd->command == TSDB_SQL_CLI_VERSION ||
-       pCmd->command == TSDB_SQL_CURRENT_USER )) {
+  // current data set are exhausted, fetch more result from node
+  if (pRes->row >= pRes->numOfRows && needToFetchNewBlock(pSql)) {
     taos_fetch_rows_a(res, waitForRetrieveRsp, pSql->pTscObj);
     tsem_wait(&pSql->rspSem);
   }
 
-  void* data = doSetResultRowData(pSql, true);
+  void* data = doSetResultRowData(pSql);
 
   tscClearSqlOwner(pSql);
   return data;
 }
 
 int taos_fetch_block(TAOS_RES *res, TAOS_ROW *rows) {
-#if 0
   SSqlObj *pSql = (SSqlObj *)res;
-  SSqlCmd *pCmd = &pSql->cmd;
-  SSqlRes *pRes = &pSql->res;
-
-  int nRows = 0;
-
   if (pSql == NULL || pSql->signature != pSql) {
     terrno = TSDB_CODE_TSC_DISCONNECTED;
-    *rows = NULL;
     return 0;
   }
 
-  // projection query on metric, pipeline retrieve data from vnode list,
-  // instead of two-stage mergednodeProcessMsgFromShell free qhandle
-  nRows = taos_fetch_block_impl(res, rows);
-
-  // current subclause is completed, try the next subclause
-  while (rows == NULL && pCmd->clauseIndex < pCmd->numOfClause - 1) {
-    SQueryInfo *pQueryInfo = tscGetQueryInfoDetail(pCmd, pCmd->clauseIndex);
-
-    pSql->cmd.command = pQueryInfo->command;
-    pCmd->clauseIndex++;
-
-    pRes->numOfTotal += pRes->numOfClauseTotal;
-    pRes->numOfClauseTotal = 0;
-    pRes->rspType = 0;
+  SSqlCmd *pCmd = &pSql->cmd;
+  SSqlRes *pRes = &pSql->res;
 
-    pSql->subState.numOfSub = 0;
-    tfree(pSql->pSubs);
+  if (pRes->qhandle == 0 ||
+      pRes->code == TSDB_CODE_TSC_QUERY_CANCELLED ||
+      pCmd->command == TSDB_SQL_RETRIEVE_EMPTY_RESULT ||
+      pCmd->command == TSDB_SQL_INSERT) {
+    return 0;
+  }
 
-    assert(pSql->fp == NULL);
+  tscResetForNextRetrieve(pRes);
 
-    tscDebug("%p try data in the next subclause:%d, total subclause:%d", pSql, pCmd->clauseIndex, pCmd->numOfClause);
-    tscProcessSql(pSql);
+  // set the sql object owner
+  tscSetSqlOwner(pSql);
 
-    nRows = taos_fetch_block_impl(res, rows);
+  // current data set are exhausted, fetch more data from node
+  if (needToFetchNewBlock(pSql)) {
+    taos_fetch_rows_a(res, waitForRetrieveRsp, pSql->pTscObj);
+    tsem_wait(&pSql->rspSem);
   }
 
-  return nRows;
-#endif
+  *rows = pRes->urow;
 
-  (*rows) = taos_fetch_row(res);
-  return ((*rows) != NULL)? 1:0;
+  tscClearSqlOwner(pSql);
+  return (int32_t) pRes->numOfRows;
 }
 
 int taos_select_db(TAOS *taos, const char *db) {
@@ -600,7 +594,7 @@ int taos_select_db(TAOS *taos, const char *db) {
 }
 
 // send free message to vnode to free qhandle and corresponding resources in vnode
-static UNUSED_FUNC bool tscKillQueryInDnode(SSqlObj* pSql) {
+static bool tscKillQueryInDnode(SSqlObj* pSql) {
   SSqlCmd* pCmd = &pSql->cmd;
   SSqlRes* pRes = &pSql->res;
 
@@ -795,6 +789,25 @@ void taos_stop_query(TAOS_RES *res) {
   tscDebug("%p query is cancelled", res);
 }
 
+bool taos_is_null(TAOS_RES *res, int32_t row, int32_t col) {
+  SSqlObj *pSql = (SSqlObj *)res;
+  if (pSql == NULL || pSql->signature != pSql) {
+    return true;
+  }
+
+  SQueryInfo* pQueryInfo = tscGetQueryInfoDetail(&pSql->cmd, 0);
+  if (pQueryInfo == NULL) {
+    return true;
+  }
+
+  SInternalField* pInfo = (SInternalField*)TARRAY_GET_ELEM(pQueryInfo->fieldsInfo.internalField, col);
+  if (col < 0 || col >= tscNumOfFields(pQueryInfo) || row < 0 || row > pSql->res.numOfRows) {
+    return true;
+  }
+
+  return isNull(((char*) pSql->res.urow[col]) + row * pInfo->field.bytes, pInfo->field.type);
+}
+
 int taos_print_row(char *str, TAOS_ROW row, TAOS_FIELD *fields, int num_fields) {
   int len = 0;
   for (int i = 0; i < num_fields; ++i) {

src/client/src/tscSubquery.c

@@ -2367,6 +2367,7 @@ static void doBuildResFromSubqueries(SSqlObj* pSql) {
   doArithmeticCalculate(pQueryInfo, pFilePage, rowSize, finalRowSize);
 
   pRes->data = pFilePage->data;
+  tscSetResRawPtr(pRes, pQueryInfo);
 }
 
 void tscBuildResFromSubqueries(SSqlObj *pSql) {
@@ -2379,13 +2380,12 @@ void tscBuildResFromSubqueries(SSqlObj *pSql) {
 
   if (pRes->tsrow == NULL) {
     SQueryInfo* pQueryInfo = tscGetQueryInfoDetail(&pSql->cmd, pSql->cmd.clauseIndex);
+    pRes->numOfCols = (int16_t) tscSqlExprNumOfExprs(pQueryInfo);
 
-    size_t numOfExprs = tscSqlExprNumOfExprs(pQueryInfo);
-    pRes->numOfCols =  (int16_t)numOfExprs;
-
-    pRes->tsrow  = calloc(numOfExprs, POINTER_BYTES);
-    pRes->buffer = calloc(numOfExprs, POINTER_BYTES);
-    pRes->length = calloc(numOfExprs, sizeof(int32_t));
+    pRes->tsrow  = calloc(pRes->numOfCols, POINTER_BYTES);
+    pRes->urow   = calloc(pRes->numOfCols, POINTER_BYTES);
+    pRes->buffer = calloc(pRes->numOfCols, POINTER_BYTES);
+    pRes->length = calloc(pRes->numOfCols, sizeof(int32_t));
 
     if (pRes->tsrow == NULL || pRes->buffer == NULL || pRes->length == NULL) {
       pRes->code = TSDB_CODE_TSC_OUT_OF_MEMORY;
@@ -2405,7 +2405,7 @@ void tscBuildResFromSubqueries(SSqlObj *pSql) {
   }
 }
 
-static void transferNcharData(SSqlObj *pSql, int32_t columnIndex, TAOS_FIELD *pField) {
+static UNUSED_FUNC void transferNcharData(SSqlObj *pSql, int32_t columnIndex, TAOS_FIELD *pField) {
   SSqlRes *pRes = &pSql->res;
   
   if (pRes->tsrow[columnIndex] != NULL && pField->type == TSDB_DATA_TYPE_NCHAR) {
@@ -2429,7 +2429,7 @@ static void transferNcharData(SSqlObj *pSql, int32_t columnIndex, TAOS_FIELD *pF
   }
 }
 
-char *getArithemicInputSrc(void *param, const char *name, int32_t colId) {
+char *getArithmeticInputSrc(void *param, const char *name, int32_t colId) {
   SArithmeticSupport *pSupport = (SArithmeticSupport *) param;
 
   int32_t index = -1;
@@ -2447,7 +2447,7 @@ char *getArithemicInputSrc(void *param, const char *name, int32_t colId) {
   return pSupport->data[index] + pSupport->offset * pExpr->resBytes;
 }
 
-TAOS_ROW doSetResultRowData(SSqlObj *pSql, bool finalResult) {
+TAOS_ROW doSetResultRowData(SSqlObj *pSql) {
   SSqlCmd *pCmd = &pSql->cmd;
   SSqlRes *pRes = &pSql->res;
 
@@ -2460,22 +2460,20 @@ TAOS_ROW doSetResultRowData(SSqlObj *pSql, bool finalResult) {
   SQueryInfo *pQueryInfo = tscGetQueryInfoDetail(pCmd, pCmd->clauseIndex);
 
   size_t size = tscNumOfFields(pQueryInfo);
-  int32_t offset = 0;
-
   for (int i = 0; i < size; ++i) {
-    tscGetResultColumnChr(pRes, &pQueryInfo->fieldsInfo, i, offset);
-    TAOS_FIELD *pField = TARRAY_GET_ELEM(pQueryInfo->fieldsInfo.internalField, i);
+    SInternalField* pInfo = (SInternalField*)TARRAY_GET_ELEM(pQueryInfo->fieldsInfo.internalField, i);
 
-    offset += pField->bytes;
+    int32_t type  = pInfo->field.type;
+    int32_t bytes = pInfo->field.bytes;
 
-    // primary key column cannot be null in interval query, no need to check
-    if (i == 0 && pQueryInfo->interval.interval > 0) {
-      continue;
+    if (type != TSDB_DATA_TYPE_BINARY && type != TSDB_DATA_TYPE_NCHAR) {
+      pRes->tsrow[i] = isNull(pRes->urow[i], type) ? NULL : pRes->urow[i];
+    } else {
+      pRes->tsrow[i] = isNull(pRes->urow[i], type) ? NULL : varDataVal(pRes->urow[i]);
+      pRes->length[i] = varDataLen(pRes->urow[i]);
     }
 
-    if (pRes->tsrow[i] != NULL && pField->type == TSDB_DATA_TYPE_NCHAR) {
-      transferNcharData(pSql, i, pField);
-    }
+    ((char**) pRes->urow)[i] += bytes;
   }
 
   pRes->row++;  // index increase one-step

src/client/src/tscUtil.c

@@ -220,13 +220,16 @@ bool tscIsPointInterpQuery(SQueryInfo* pQueryInfo) {
 }
 
 bool tscIsSecondStageQuery(SQueryInfo* pQueryInfo) {
-  size_t numOfOutput = tscNumOfFields(pQueryInfo);
-  size_t numOfExprs = tscSqlExprNumOfExprs(pQueryInfo);
+  STableMetaInfo* pTableMetaInfo = pQueryInfo->pTableMetaInfo[0];
+  if (UTIL_TABLE_IS_SUPER_TABLE(pTableMetaInfo)) {
+    return false;
+  }
 
-  if (numOfOutput == numOfExprs) {
+  if (tscIsProjectionQuery(pQueryInfo)) {
     return false;
   }
 
+  size_t numOfOutput = tscNumOfFields(pQueryInfo);
   for(int32_t i = 0; i < numOfOutput; ++i) {
     SExprInfo* pExprInfo = tscFieldInfoGetInternalField(&pQueryInfo->fieldsInfo, i)->pArithExprInfo;
     if (pExprInfo != NULL) {
@@ -265,16 +268,20 @@ void tscClearInterpInfo(SQueryInfo* pQueryInfo) {
 
 int32_t tscCreateResPointerInfo(SSqlRes* pRes, SQueryInfo* pQueryInfo) {
   if (pRes->tsrow == NULL) {
-    int32_t numOfOutput = pQueryInfo->fieldsInfo.numOfOutput;
-    pRes->numOfCols = numOfOutput;
+    pRes->numOfCols = pQueryInfo->fieldsInfo.numOfOutput;
 
-    pRes->tsrow  = calloc(numOfOutput, POINTER_BYTES);
-    pRes->length = calloc(numOfOutput, sizeof(int32_t));
-    pRes->buffer = calloc(numOfOutput, POINTER_BYTES);
+    pRes->tsrow  = calloc(pRes->numOfCols, POINTER_BYTES);
+    pRes->urow   = calloc(pRes->numOfCols, POINTER_BYTES);
+    pRes->length = calloc(pRes->numOfCols, sizeof(int32_t));
+    pRes->buffer = calloc(pRes->numOfCols, POINTER_BYTES);
 
     // not enough memory
-    if (pRes->tsrow == NULL || (pRes->buffer == NULL && pRes->numOfCols > 0)) {
+    if (pRes->tsrow == NULL  || pRes->urow == NULL || pRes->length == NULL || (pRes->buffer == NULL && pRes->numOfCols > 0)) {
       tfree(pRes->tsrow);
+      tfree(pRes->urow);
+      tfree(pRes->length);
+      tfree(pRes->buffer);
+
       pRes->code = TSDB_CODE_TSC_OUT_OF_MEMORY;
       return pRes->code;
     }
@@ -283,6 +290,71 @@ int32_t tscCreateResPointerInfo(SSqlRes* pRes, SQueryInfo* pQueryInfo) {
   return TSDB_CODE_SUCCESS;
 }
 
+void tscSetResRawPtr(SSqlRes* pRes, SQueryInfo* pQueryInfo) {
+  assert(pRes->numOfCols > 0);
+
+  int32_t offset = 0;
+
+  for (int32_t i = 0; i < pRes->numOfCols; ++i) {
+    SInternalField* pInfo = (SInternalField*)TARRAY_GET_ELEM(pQueryInfo->fieldsInfo.internalField, i);
+
+    pRes->urow[i] = pRes->data + offset * pRes->numOfRows;
+    pRes->length[i] = pInfo->field.bytes;
+
+    offset += pInfo->field.bytes;
+
+    // generated the user-defined column result
+    if (pInfo->pSqlExpr != NULL && TSDB_COL_IS_UD_COL(pInfo->pSqlExpr->colInfo.flag)) {
+      if (pInfo->pSqlExpr->param[1].nType == TSDB_DATA_TYPE_NULL) {
+        setNullN(pRes->urow[i], pInfo->field.type, pInfo->field.bytes, (int32_t) pRes->numOfRows);
+      } else {
+        if (pInfo->field.type == TSDB_DATA_TYPE_NCHAR || pInfo->field.type == TSDB_DATA_TYPE_BINARY) {
+          assert(pInfo->pSqlExpr->param[1].nLen <= pInfo->field.bytes);
+
+          for (int32_t k = 0; k < pRes->numOfRows; ++k) {
+            char* p = ((char**)pRes->urow)[i] + k * pInfo->field.bytes;
+
+            memcpy(varDataVal(p), pInfo->pSqlExpr->param[1].pz, pInfo->pSqlExpr->param[1].nLen);
+            varDataSetLen(p, pInfo->pSqlExpr->param[1].nLen);
+          }
+        } else {
+          for (int32_t k = 0; k < pRes->numOfRows; ++k) {
+            char* p = ((char**)pRes->urow)[i] + k * pInfo->field.bytes;
+            memcpy(p, &pInfo->pSqlExpr->param[1].i64Key, pInfo->field.bytes);
+          }
+        }
+      }
+
+    } else if (pInfo->field.type == TSDB_DATA_TYPE_NCHAR) {
+      // convert unicode to native code in a temporary buffer extra one byte for terminated symbol
+      pRes->buffer[i] = realloc(pRes->buffer[i], pInfo->field.bytes * pRes->numOfRows);
+
+      // string terminated char for binary data
+      memset(pRes->buffer[i], 0, pInfo->field.bytes * pRes->numOfRows);
+
+      char* p = pRes->urow[i];
+      for (int32_t k = 0; k < pRes->numOfRows; ++k) {
+        char* dst = pRes->buffer[i] + k * pInfo->field.bytes;
+
+        if (isNull(p, TSDB_DATA_TYPE_NCHAR)) {
+          memcpy(dst, p, varDataTLen(p));
+        } else {
+          int32_t length = taosUcs4ToMbs(varDataVal(p), varDataLen(p), varDataVal(dst));
+          varDataSetLen(dst, length);
+
+          if (length == 0) {
+            tscError("charset:%s to %s. val:%s convert failed.", DEFAULT_UNICODE_ENCODEC, tsCharset, (char*)p);
+          }
+        }
+
+        p += pInfo->field.bytes;
+      }
+
+      memcpy(pRes->urow[i], pRes->buffer[i], pInfo->field.bytes * pRes->numOfRows);
+    }
+  }
+}
+
 static void tscDestroyResPointerInfo(SSqlRes* pRes) {
   if (pRes->buffer != NULL) { // free all buffers containing the multibyte string
     for (int i = 0; i < pRes->numOfCols; i++) {
@@ -297,6 +369,7 @@ static void tscDestroyResPointerInfo(SSqlRes* pRes) {
   tfree(pRes->tsrow);
   tfree(pRes->length);
   tfree(pRes->buffer);
+  tfree(pRes->urow);
 
   tfree(pRes->pGroupRec);
   tfree(pRes->pColumnIndex);

src/connector/jdbc/src/main/java/com/taosdata/jdbc/ColumnMetaData.java

@@ -16,10 +16,10 @@ package com.taosdata.jdbc;
 
 public class ColumnMetaData {
 
-	int colType = 0;
-	String colName = null;
-	int colSize = -1;
-	int colIndex = 0;
+	private int colType = 0;
+	private String colName = null;
+	private int colSize = -1;
+	private int colIndex = 0;
 
 	public int getColSize() {
 		return colSize;

src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBConnection.java

@@ -14,7 +14,6 @@
  *****************************************************************************/
 package com.taosdata.jdbc;
 
-import java.io.*;
 import java.sql.Array;
 import java.sql.Blob;
 import java.sql.CallableStatement;
@@ -35,11 +34,10 @@ import java.util.*;
 import java.util.concurrent.Executor;
 
 public class TSDBConnection implements Connection {
+    protected Properties props = null;
 
     private TSDBJNIConnector connector = null;
 
-    protected Properties props = null;
-
     private String catalog = null;
 
     private TSDBDatabaseMetaData dbMetaData = null;
@@ -48,14 +46,20 @@ public class TSDBConnection implements Connection {
 
     private int timeoutMilliseconds = 0;
     
-    private String tsCharSet = "";
+    private boolean batchFetch = false;
 
     public TSDBConnection(Properties info, TSDBDatabaseMetaData meta) throws SQLException {
         this.dbMetaData = meta;
         connect(info.getProperty(TSDBDriver.PROPERTY_KEY_HOST),
                 Integer.parseInt(info.getProperty(TSDBDriver.PROPERTY_KEY_PORT, "0")),
-                info.getProperty(TSDBDriver.PROPERTY_KEY_DBNAME), info.getProperty(TSDBDriver.PROPERTY_KEY_USER),
+                info.getProperty(TSDBDriver.PROPERTY_KEY_DBNAME), 
+                info.getProperty(TSDBDriver.PROPERTY_KEY_USER),
                 info.getProperty(TSDBDriver.PROPERTY_KEY_PASSWORD));
+        
+        String batchLoad = info.getProperty(TSDBDriver.PROPERTY_KEY_BATCH_LOAD);
+        if (batchLoad != null) {
+        	this.batchFetch = Boolean.parseBoolean(batchLoad);
+        }
     }
 
     private void connect(String host, int port, String dbName, String user, String password) throws SQLException {
@@ -224,6 +228,14 @@ public class TSDBConnection implements Connection {
         return this.prepareStatement(sql);
     }
     
+    public Boolean getBatchFetch() {
+    	return this.batchFetch;
+    }
+    
+    public void setBatchFetch(Boolean batchFetch) {
+    	this.batchFetch = batchFetch;
+    }
+
     public CallableStatement prepareCall(String sql, int resultSetType, int resultSetConcurrency) throws SQLException {
         throw new SQLException(TSDBConstants.UNSUPPORT_METHOD_EXCEPTIONZ_MSG);
     }

src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBDriver.java

@@ -86,6 +86,11 @@ public class TSDBDriver extends AbstractTaosDriver {
      */
     public static final String PROPERTY_KEY_CHARSET = "charset";
 
+    /**
+     * fetch data from native function in a batch model
+     */
+    public static final String PROPERTY_KEY_BATCH_LOAD = "batch";
+    
     private TSDBDatabaseMetaData dbMetaData = null;
 
     static {
@@ -172,26 +177,21 @@ public class TSDBDriver extends AbstractTaosDriver {
             url = url.substring(0, index);
             StringTokenizer queryParams = new StringTokenizer(paramString, "&");
             while (queryParams.hasMoreElements()) {
-                String parameterValuePair = queryParams.nextToken();
-                int indexOfEqual = parameterValuePair.indexOf("=");
-                String parameter = null;
-                String value = null;
-                if (indexOfEqual != -1) {
-                    parameter = parameterValuePair.substring(0, indexOfEqual);
-                    if (indexOfEqual + 1 < parameterValuePair.length()) {
-                        value = parameterValuePair.substring(indexOfEqual + 1);
-                    }
-                }
-                if ((value != null && value.length() > 0) && (parameter != null && parameter.length() > 0)) {
-                    urlProps.setProperty(parameter, value);
+                String oneToken = queryParams.nextToken();
+                String[] pair = oneToken.split("=");
+                
+                if ((pair[0] != null && pair[0].trim().length() > 0) && (pair[1] != null && pair[1].trim().length() > 0)) {
+                    urlProps.setProperty(pair[0].trim(), pair[1].trim());
                 }
             }
         }
+        
         // parse Product Name
         String dbProductName = url.substring(0, beginningOfSlashes);
         dbProductName = dbProductName.substring(dbProductName.indexOf(":") + 1);
         dbProductName = dbProductName.substring(0, dbProductName.indexOf(":"));
-        // parse dbname
+        
+        // parse database name
         url = url.substring(beginningOfSlashes + 2);
         int indexOfSlash = url.indexOf("/");
         if (indexOfSlash != -1) {
@@ -200,6 +200,7 @@ public class TSDBDriver extends AbstractTaosDriver {
             }
             url = url.substring(0, indexOfSlash);
         }
+        
         // parse port
         int indexOfColon = url.indexOf(":");
         if (indexOfColon != -1) {
@@ -208,9 +209,11 @@ public class TSDBDriver extends AbstractTaosDriver {
             }
             url = url.substring(0, indexOfColon);
         }
+        
         if (url != null && url.length() > 0 && url.trim().length() > 0) {
             urlProps.setProperty(TSDBDriver.PROPERTY_KEY_HOST, url);
         }
+        
         this.dbMetaData = new TSDBDatabaseMetaData(dbProductName, urlForMeta, urlProps.getProperty(TSDBDriver.PROPERTY_KEY_USER));
         return urlProps;
     }

src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBJNIConnector.java

@@ -243,6 +243,11 @@ public class TSDBJNIConnector {
 
     private native int fetchRowImp(long connection, long resultSet, TSDBResultSetRowData rowData);
 
+    public int fetchBlock(long resultSet, TSDBResultSetBlockData blockData) {
+		return this.fetchBlockImp(this.taos, resultSet, blockData);
+    }
+    
+    private native int fetchBlockImp(long connection, long resultSet, TSDBResultSetBlockData blockData);
     /**
      * Execute close operation from C to release connection pointer by JNI
      *

src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBResultSet.java

@@ -47,10 +47,14 @@ public class TSDBResultSet implements ResultSet {
 	private List<ColumnMetaData> columnMetaDataList = new ArrayList<ColumnMetaData>();
 
 	private TSDBResultSetRowData rowData;
+	private TSDBResultSetBlockData blockData;
 
+	private boolean batchFetch = false;
 	private boolean lastWasNull = false;
 	private final int COLUMN_INDEX_START_VALUE = 1;
 
+	private int rowIndex = 0;
+
 	public TSDBJNIConnector getJniConnector() {
 		return jniConnector;
 	}
@@ -67,6 +71,14 @@ public class TSDBResultSet implements ResultSet {
 		this.resultSetPointer = resultSetPointer;
 	}
 
+	public void setBatchFetch(boolean batchFetch) {
+		this.batchFetch = batchFetch;
+	}
+	
+	public Boolean getBatchFetch() {
+		return this.batchFetch;
+	}
+
 	public List<ColumnMetaData> getColumnMetaDataList() {
 		return columnMetaDataList;
 	}
@@ -94,8 +106,8 @@ public class TSDBResultSet implements ResultSet {
 	public TSDBResultSet() {
 	}
 
-	public TSDBResultSet(TSDBJNIConnector connecter, long resultSetPointer) throws SQLException {
-		this.jniConnector = connecter;
+	public TSDBResultSet(TSDBJNIConnector connector, long resultSetPointer) throws SQLException {
+		this.jniConnector = connector;
 		this.resultSetPointer = resultSetPointer;
 		int code = this.jniConnector.getSchemaMetaData(this.resultSetPointer, this.columnMetaDataList);
 		if (code == TSDBConstants.JNI_CONNECTION_NULL) {
@@ -107,6 +119,7 @@ public class TSDBResultSet implements ResultSet {
 		}
 
 		this.rowData = new TSDBResultSetRowData(this.columnMetaDataList.size());
+		this.blockData = new TSDBResultSetBlockData(this.columnMetaDataList, this.columnMetaDataList.size());
 	}
 
 	public <T> T unwrap(Class<T> iface) throws SQLException {
@@ -118,6 +131,26 @@ public class TSDBResultSet implements ResultSet {
 	}
 
 	public boolean next() throws SQLException {
+		if (this.getBatchFetch()) {
+			if (this.blockData.forward()) {
+				return true;
+			}
+
+			int code = this.jniConnector.fetchBlock(this.resultSetPointer, this.blockData);
+			this.blockData.reset();
+
+			if (code == TSDBConstants.JNI_CONNECTION_NULL) {
+				throw new SQLException(TSDBConstants.FixErrMsg(TSDBConstants.JNI_CONNECTION_NULL));
+			} else if (code == TSDBConstants.JNI_RESULT_SET_NULL) {
+				throw new SQLException(TSDBConstants.FixErrMsg(TSDBConstants.JNI_RESULT_SET_NULL));
+			} else if (code == TSDBConstants.JNI_NUM_OF_FIELDS_0) {
+				throw new SQLException(TSDBConstants.FixErrMsg(TSDBConstants.JNI_NUM_OF_FIELDS_0));
+			} else if (code == TSDBConstants.JNI_FETCH_END) {
+				return false;
+			}
+
+			return true;
+		} else {
 			if (rowData != null) {
 				this.rowData.clear();
 			}
@@ -135,6 +168,7 @@ public class TSDBResultSet implements ResultSet {
 				return true;
 			}
 		}
+	}
 
 	public void close() throws SQLException {
 		if (this.jniConnector != null) {
@@ -155,21 +189,30 @@ public class TSDBResultSet implements ResultSet {
 		String res = null;
 		int colIndex = getTrueColumnIndex(columnIndex);
 
+		if (!this.getBatchFetch()) {
 			this.lastWasNull = this.rowData.wasNull(colIndex);
 			if (!lastWasNull) {
 				res = this.rowData.getString(colIndex, this.columnMetaDataList.get(colIndex).getColType());
 			}
 			return res;
+		} else {
+			return this.blockData.getString(colIndex);
+		}
 	}
 
 	public boolean getBoolean(int columnIndex) throws SQLException {
 		boolean res = false;
 		int colIndex = getTrueColumnIndex(columnIndex);
 
+		if (!this.getBatchFetch()) {
 			this.lastWasNull = this.rowData.wasNull(colIndex);
 			if (!lastWasNull) {
 				res = this.rowData.getBoolean(colIndex, this.columnMetaDataList.get(colIndex).getColType());
 			}
+		} else {
+			return this.blockData.getBoolean(colIndex);
+		}
+
 		return res;
 	}
 
@@ -177,66 +220,91 @@ public class TSDBResultSet implements ResultSet {
 		byte res = 0;
 		int colIndex = getTrueColumnIndex(columnIndex);
 
+		if (!this.getBatchFetch()) {
 			this.lastWasNull = this.rowData.wasNull(colIndex);
 			if (!lastWasNull) {
 				res = (byte) this.rowData.getInt(colIndex, this.columnMetaDataList.get(colIndex).getColType());
 			}
 			return res;
+		} else {
+			return (byte) this.blockData.getInt(colIndex);
+		}
 	}
 
 	public short getShort(int columnIndex) throws SQLException {
 		short res = 0;
 		int colIndex = getTrueColumnIndex(columnIndex);
 
+		if (!this.getBatchFetch()) {
 			this.lastWasNull = this.rowData.wasNull(colIndex);
 			if (!lastWasNull) {
 				res = (short) this.rowData.getInt(colIndex, this.columnMetaDataList.get(colIndex).getColType());
 			}
 			return res;
+		} else {
+			return (short) this.blockData.getInt(colIndex);
+		}
 	}
 
 	public int getInt(int columnIndex) throws SQLException {
 		int res = 0;
 		int colIndex = getTrueColumnIndex(columnIndex);
 
+		if (!this.getBatchFetch()) {
 			this.lastWasNull = this.rowData.wasNull(colIndex);
 			if (!lastWasNull) {
 				res = this.rowData.getInt(colIndex, this.columnMetaDataList.get(colIndex).getColType());
 			}
 			return res;
+		} else {
+			return this.blockData.getInt(colIndex);
+		}
+
 	}
 
 	public long getLong(int columnIndex) throws SQLException {
 		long res = 0l;
 		int colIndex = getTrueColumnIndex(columnIndex);
 
+		if (!this.getBatchFetch()) {
 			this.lastWasNull = this.rowData.wasNull(colIndex);
 			if (!lastWasNull) {
 				res = this.rowData.getLong(colIndex, this.columnMetaDataList.get(colIndex).getColType());
 			}
 			return res;
+		} else {
+			return this.blockData.getLong(colIndex);
+		}
 	}
 
 	public float getFloat(int columnIndex) throws SQLException {
 		float res = 0;
 		int colIndex = getTrueColumnIndex(columnIndex);
 
+		if (!this.getBatchFetch()) {
 			this.lastWasNull = this.rowData.wasNull(colIndex);
 			if (!lastWasNull) {
 				res = this.rowData.getFloat(colIndex, this.columnMetaDataList.get(colIndex).getColType());
 			}
 			return res;
+		} else {
+			return (float) this.blockData.getDouble(colIndex);
+		}
 	}
 
 	public double getDouble(int columnIndex) throws SQLException {
 		double res = 0;
 		int colIndex = getTrueColumnIndex(columnIndex);
 
+		if (!this.getBatchFetch()) {
 			this.lastWasNull = this.rowData.wasNull(colIndex);
 			if (!lastWasNull) {
 				res = this.rowData.getDouble(colIndex, this.columnMetaDataList.get(colIndex).getColType());
 			}
 			return res;
+		} else {
+			return this.blockData.getDouble(colIndex);
+		}
 	}
 
 	/*
@@ -249,25 +317,11 @@ public class TSDBResultSet implements ResultSet {
 	 */
 	@Deprecated
 	public BigDecimal getBigDecimal(int columnIndex, int scale) throws SQLException {
-		BigDecimal res = null;
-		int colIndex = getTrueColumnIndex(columnIndex);
-
-		this.lastWasNull = this.rowData.wasNull(colIndex);
-		if (!lastWasNull) {
-			res = new BigDecimal(this.rowData.getLong(colIndex, this.columnMetaDataList.get(colIndex).getColType()));
-		}
-		return res;
+		return new BigDecimal(getLong(columnIndex));
 	}
 
 	public byte[] getBytes(int columnIndex) throws SQLException {
-		byte[] res = null;
-		int colIndex = getTrueColumnIndex(columnIndex);
-
-		this.lastWasNull = this.rowData.wasNull(colIndex);
-		if (!lastWasNull) {
-			res = this.rowData.getString(colIndex, this.columnMetaDataList.get(colIndex).getColType()).getBytes();
-		}
-		return res;
+		return getString(columnIndex).getBytes();
 	}
 
 	public Date getDate(int columnIndex) throws SQLException {
@@ -284,11 +338,15 @@ public class TSDBResultSet implements ResultSet {
 		Timestamp res = null;
 		int colIndex = getTrueColumnIndex(columnIndex);
 
+		if (!this.getBatchFetch()) {
 			this.lastWasNull = this.rowData.wasNull(colIndex);
 			if (!lastWasNull) {
 				res = this.rowData.getTimestamp(colIndex);
 			}
 			return res;
+		} else {
+			return this.blockData.getTimestamp(columnIndex);
+		}
 	}
 
 	public InputStream getAsciiStream(int columnIndex) throws SQLException {
@@ -400,8 +458,12 @@ public class TSDBResultSet implements ResultSet {
 	public Object getObject(int columnIndex) throws SQLException {
 		int colIndex = getTrueColumnIndex(columnIndex);
 
+		if (!this.getBatchFetch()) {
 			this.lastWasNull = this.rowData.wasNull(colIndex);
 			return this.rowData.get(colIndex);
+		} else {
+			return this.blockData.get(colIndex);
+		}
 	}
 
 	public Object getObject(String columnLabel) throws SQLException {
@@ -433,8 +495,12 @@ public class TSDBResultSet implements ResultSet {
 	public BigDecimal getBigDecimal(int columnIndex) throws SQLException {
 		int colIndex = getTrueColumnIndex(columnIndex);
 
+		if (!this.getBatchFetch()) {
 			this.lastWasNull = this.rowData.wasNull(colIndex);
 			return new BigDecimal(this.rowData.getLong(colIndex, this.columnMetaDataList.get(colIndex).getColType()));
+		} else {
+			return new BigDecimal(this.blockData.getLong(colIndex));
+		}
 	}
 
 	public BigDecimal getBigDecimal(String columnLabel) throws SQLException {

src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBResultSetBlockData.java

+/***************************************************************************
+ * Copyright (c) 2019 TAOS Data, Inc. <jhtao@taosdata.com>
+ *
+ * This program is free software: you can use, redistribute, and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3
+ * or later ("AGPL"), as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *****************************************************************************/
+package com.taosdata.jdbc;
+
+import java.io.UnsupportedEncodingException;
+import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
+import java.nio.DoubleBuffer;
+import java.nio.FloatBuffer;
+import java.nio.IntBuffer;
+import java.nio.LongBuffer;
+import java.nio.ShortBuffer;
+import java.sql.SQLDataException;
+import java.sql.SQLException;
+import java.sql.Timestamp;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+public class TSDBResultSetBlockData {
+	private int numOfRows = 0;
+	private int numOfCols = 0;
+
+	private int rowIndex = 0;
+
+	private List<ColumnMetaData> columnMetaDataList;
+	private ArrayList<Object> colData = null;
+
+	public TSDBResultSetBlockData(List<ColumnMetaData> colMeta, int numOfCols) {
+		this.columnMetaDataList = colMeta;
+		this.setNumOfCols(numOfCols);
+	}
+
+	public TSDBResultSetBlockData() {
+		this.colData = new ArrayList<Object>();
+		this.setNumOfCols(0);
+	}
+
+	public void clear() {
+		if (this.colData != null) {
+			this.colData.clear();
+		}
+
+		if (this.numOfCols == 0) {
+			return;
+		}
+	}
+
+	public int getNumOfRows() {
+		return this.numOfRows;
+	}
+
+	public void setNumOfRows(int numOfRows) {
+		this.numOfRows = numOfRows;
+	}
+
+	public int getNumOfCols() {
+		return numOfCols;
+	}
+
+	public void setNumOfCols(int numOfCols) {
+		this.numOfCols = numOfCols;
+		this.clear();
+	}
+
+	public boolean hasMore() {
+		return this.rowIndex < this.numOfRows;
+	}
+
+	public boolean forward() {
+		if (this.rowIndex > this.numOfRows) {
+			return false;
+		}
+
+		return ((++this.rowIndex) < this.numOfRows);
+	}
+
+	public void reset() {
+		this.rowIndex = 0;
+	}
+
+	public void setBoolean(int col, boolean value) {
+		colData.set(col, value);
+	}
+
+	public void setByteArray(int col, int length, byte[] value) {
+		try {
+			switch (this.columnMetaDataList.get(col).getColType()) {
+			case TSDBConstants.TSDB_DATA_TYPE_BOOL: {
+				ByteBuffer buf = ByteBuffer.wrap(value, 0, length);
+				buf.order(ByteOrder.LITTLE_ENDIAN).asCharBuffer();
+				this.colData.set(col, buf);
+				break;
+			}
+			case TSDBConstants.TSDB_DATA_TYPE_TINYINT: {
+				ByteBuffer buf = ByteBuffer.wrap(value, 0, length);
+				buf.order(ByteOrder.LITTLE_ENDIAN);
+				this.colData.set(col, buf);
+				break;
+			}
+			case TSDBConstants.TSDB_DATA_TYPE_SMALLINT: {
+				ByteBuffer buf = ByteBuffer.wrap(value, 0, length);
+				ShortBuffer sb = buf.order(ByteOrder.LITTLE_ENDIAN).asShortBuffer();
+				this.colData.set(col, sb);
+				break;
+			}
+			case TSDBConstants.TSDB_DATA_TYPE_INT: {
+				ByteBuffer buf = ByteBuffer.wrap(value, 0, length);
+				IntBuffer ib = buf.order(ByteOrder.LITTLE_ENDIAN).asIntBuffer();
+				this.colData.set(col, ib);
+				break;
+			}
+			case TSDBConstants.TSDB_DATA_TYPE_BIGINT: {
+				ByteBuffer buf = ByteBuffer.wrap(value, 0, length);
+				LongBuffer lb = buf.order(ByteOrder.LITTLE_ENDIAN).asLongBuffer();
+				this.colData.set(col, lb);
+				break;
+			}
+			case TSDBConstants.TSDB_DATA_TYPE_FLOAT: {
+				ByteBuffer buf = ByteBuffer.wrap(value, 0, length);
+				FloatBuffer fb = buf.order(ByteOrder.LITTLE_ENDIAN).asFloatBuffer();
+				this.colData.set(col, fb);
+				break;
+			}
+			case TSDBConstants.TSDB_DATA_TYPE_DOUBLE: {
+				ByteBuffer buf = ByteBuffer.wrap(value, 0, length);
+				DoubleBuffer db = buf.order(ByteOrder.LITTLE_ENDIAN).asDoubleBuffer();
+				this.colData.set(col, db);
+				break;
+			}
+			case TSDBConstants.TSDB_DATA_TYPE_BINARY: {
+				ByteBuffer buf = ByteBuffer.wrap(value, 0, length);
+				buf.order(ByteOrder.LITTLE_ENDIAN);
+				this.colData.set(col, buf);
+				break;
+			}
+			case TSDBConstants.TSDB_DATA_TYPE_TIMESTAMP: {
+				ByteBuffer buf = ByteBuffer.wrap(value, 0, length);
+				LongBuffer lb = buf.order(ByteOrder.LITTLE_ENDIAN).asLongBuffer();
+				this.colData.set(col, lb);
+				break;
+			}
+			case TSDBConstants.TSDB_DATA_TYPE_NCHAR: {
+				ByteBuffer buf = ByteBuffer.wrap(value, 0, length);
+				buf.order(ByteOrder.LITTLE_ENDIAN);
+				this.colData.set(col, buf);
+				break;
+			}
+			}
+		} catch (Exception e) {
+			e.printStackTrace();
+		}
+	}
+
+	private static class NullType {
+		private static final byte NULL_BOOL_VAL = 0x2;
+		private static final String NULL_STR = "null";
+		
+		public String toString() {
+			return NullType.NULL_STR;
+		}
+
+		public static boolean isBooleanNull(byte val) {
+			return val == NullType.NULL_BOOL_VAL;
+		}
+
+		private static boolean isTinyIntNull(byte val) {
+			return val == Byte.MIN_VALUE;
+		}
+
+		private static boolean isSmallIntNull(short val) {
+			return val == Short.MIN_VALUE;
+		}
+
+		private static boolean isIntNull(int val) {
+			return val == Integer.MIN_VALUE;
+		}
+
+		private static boolean isBigIntNull(long val) {
+			return val == Long.MIN_VALUE;
+		}
+
+		private static boolean isFloatNull(float val) {
+			return Float.isNaN(val);
+		}
+
+		private static boolean isDoubleNull(double val) {
+			return Double.isNaN(val);
+		}
+
+		private static boolean isBinaryNull(byte[] val, int length) {
+			if (length != Byte.BYTES) {
+				return false;
+			}
+
+			return val[0] == 0xFF;
+		}
+
+		private static boolean isNcharNull(byte[] val, int length) {
+			if (length != Integer.BYTES) {
+				return false;
+			}
+
+			return (val[0] & val[1] & val[2] & val[3]) == 0xFF;
+		}
+
+	}
+
+	/**
+	 * The original type may not be a string type, but will be converted to by
+	 * calling this method
+	 * 
+	 * @param col column index
+	 * @return
+	 * @throws SQLException
+	 */
+	public String getString(int col) throws SQLException {
+		Object obj = get(col);
+		if (obj == null) {
+			return new NullType().toString();
+		}
+
+		return obj.toString();
+	}
+
+	public int getInt(int col) {
+		Object obj = get(col);
+		if (obj == null) {
+			return 0;
+		}
+
+		int type = this.columnMetaDataList.get(col).getColType();
+		switch (type) {
+		case TSDBConstants.TSDB_DATA_TYPE_BOOL:
+		case TSDBConstants.TSDB_DATA_TYPE_TINYINT:
+		case TSDBConstants.TSDB_DATA_TYPE_SMALLINT:
+		case TSDBConstants.TSDB_DATA_TYPE_INT: {
+			return (int) obj;
+		}
+		case TSDBConstants.TSDB_DATA_TYPE_BIGINT:
+		case TSDBConstants.TSDB_DATA_TYPE_TIMESTAMP: {
+			return ((Long) obj).intValue();
+		}
+
+		case TSDBConstants.TSDB_DATA_TYPE_FLOAT:
+		case TSDBConstants.TSDB_DATA_TYPE_DOUBLE: {
+			return ((Double) obj).intValue();
+		}
+
+		case TSDBConstants.TSDB_DATA_TYPE_NCHAR:
+		case TSDBConstants.TSDB_DATA_TYPE_BINARY: {
+			return Integer.parseInt((String) obj);
+		}
+		}
+
+		return 0;
+	}
+
+	public boolean getBoolean(int col) throws SQLException {
+		Object obj = get(col);
+		if (obj == null) {
+			return Boolean.FALSE;
+		}
+
+		int type = this.columnMetaDataList.get(col).getColType();
+		switch (type) {
+		case TSDBConstants.TSDB_DATA_TYPE_BOOL:
+		case TSDBConstants.TSDB_DATA_TYPE_TINYINT:
+		case TSDBConstants.TSDB_DATA_TYPE_SMALLINT:
+		case TSDBConstants.TSDB_DATA_TYPE_INT: {
+			return ((int) obj == 0L) ? Boolean.FALSE : Boolean.TRUE;
+		}
+		case TSDBConstants.TSDB_DATA_TYPE_BIGINT:
+		case TSDBConstants.TSDB_DATA_TYPE_TIMESTAMP: {
+			return (((Long) obj) == 0L) ? Boolean.FALSE : Boolean.TRUE;
+		}
+
+		case TSDBConstants.TSDB_DATA_TYPE_FLOAT:
+		case TSDBConstants.TSDB_DATA_TYPE_DOUBLE: {
+			return (((Double) obj) == 0) ? Boolean.FALSE : Boolean.TRUE;
+		}
+
+		case TSDBConstants.TSDB_DATA_TYPE_NCHAR:
+		case TSDBConstants.TSDB_DATA_TYPE_BINARY: {
+			if ("TRUE".compareToIgnoreCase((String) obj) == 0) {
+				return Boolean.TRUE;
+			} else if ("FALSE".compareToIgnoreCase((String) obj) == 0) {
+				return Boolean.TRUE;
+			} else {
+				throw new SQLDataException();
+			}
+		}
+		}
+
+		return Boolean.FALSE;
+	}
+
+	public long getLong(int col) throws SQLException {
+		Object obj = get(col);
+		if (obj == null) {
+			return 0;
+		}
+
+		int type = this.columnMetaDataList.get(col).getColType();
+		switch (type) {
+		case TSDBConstants.TSDB_DATA_TYPE_BOOL:
+		case TSDBConstants.TSDB_DATA_TYPE_TINYINT:
+		case TSDBConstants.TSDB_DATA_TYPE_SMALLINT:
+		case TSDBConstants.TSDB_DATA_TYPE_INT: {
+			return (int) obj;
+		}
+		case TSDBConstants.TSDB_DATA_TYPE_BIGINT:
+		case TSDBConstants.TSDB_DATA_TYPE_TIMESTAMP: {
+			return (long) obj;
+		}
+
+		case TSDBConstants.TSDB_DATA_TYPE_FLOAT:
+		case TSDBConstants.TSDB_DATA_TYPE_DOUBLE: {
+			return ((Double) obj).longValue();
+		}
+
+		case TSDBConstants.TSDB_DATA_TYPE_NCHAR:
+		case TSDBConstants.TSDB_DATA_TYPE_BINARY: {
+			return Long.parseLong((String) obj);
+		}
+		}
+
+		return 0;
+	}
+
+	public Timestamp getTimestamp(int col) {
+		try {
+			return new Timestamp(getLong(col));
+		} catch (SQLException e) {
+			e.printStackTrace();
+		}
+
+		return null;
+	}
+
+	public double getDouble(int col) {
+		Object obj = get(col);
+		if (obj == null) {
+			return 0;
+		}
+
+		int type = this.columnMetaDataList.get(col).getColType();
+		switch (type) {
+		case TSDBConstants.TSDB_DATA_TYPE_BOOL:
+		case TSDBConstants.TSDB_DATA_TYPE_TINYINT:
+		case TSDBConstants.TSDB_DATA_TYPE_SMALLINT:
+		case TSDBConstants.TSDB_DATA_TYPE_INT: {
+			return (int) obj;
+		}
+		case TSDBConstants.TSDB_DATA_TYPE_BIGINT:
+		case TSDBConstants.TSDB_DATA_TYPE_TIMESTAMP: {
+			return (long) obj;
+		}
+
+		case TSDBConstants.TSDB_DATA_TYPE_FLOAT:
+		case TSDBConstants.TSDB_DATA_TYPE_DOUBLE: {
+			return (double) obj;
+		}
+
+		case TSDBConstants.TSDB_DATA_TYPE_NCHAR:
+		case TSDBConstants.TSDB_DATA_TYPE_BINARY: {
+			return Double.parseDouble((String) obj);
+		}
+		}
+
+		return 0;
+	}
+
+	public Object get(int col) {
+		int fieldSize = this.columnMetaDataList.get(col).getColSize();
+
+		switch (this.columnMetaDataList.get(col).getColType()) {
+		case TSDBConstants.TSDB_DATA_TYPE_BOOL: {
+			ByteBuffer bb = (ByteBuffer) this.colData.get(col);
+
+			byte val = bb.get(this.rowIndex);
+			if (NullType.isBooleanNull(val)) {
+				return null;
+			}
+
+			return (val == 0x0) ? Boolean.FALSE : Boolean.TRUE;
+		}
+
+		case TSDBConstants.TSDB_DATA_TYPE_TINYINT: {
+			ByteBuffer bb = (ByteBuffer) this.colData.get(col);
+
+			byte val = bb.get(this.rowIndex);
+			if (NullType.isTinyIntNull(val)) {
+				return null;
+			}
+
+			return val;
+		}
+
+		case TSDBConstants.TSDB_DATA_TYPE_SMALLINT: {
+			ShortBuffer sb = (ShortBuffer) this.colData.get(col);
+			short val = sb.get(this.rowIndex);
+			if (NullType.isSmallIntNull(val)) {
+				return null;
+			}
+
+			return val;
+		}
+
+		case TSDBConstants.TSDB_DATA_TYPE_INT: {
+			IntBuffer ib = (IntBuffer) this.colData.get(col);
+			int val = ib.get(this.rowIndex);
+			if (NullType.isIntNull(val)) {
+				return null;
+			}
+
+			return val;
+		}
+
+		case TSDBConstants.TSDB_DATA_TYPE_TIMESTAMP:
+		case TSDBConstants.TSDB_DATA_TYPE_BIGINT: {
+			LongBuffer lb = (LongBuffer) this.colData.get(col);
+			long val = lb.get(this.rowIndex);
+			if (NullType.isBigIntNull(val)) {
+				return null;
+			}
+
+			return (long) val;
+		}
+
+		case TSDBConstants.TSDB_DATA_TYPE_FLOAT: {
+			FloatBuffer fb = (FloatBuffer) this.colData.get(col);
+			float val = fb.get(this.rowIndex);
+			if (NullType.isFloatNull(val)) {
+				return null;
+			}
+
+			return val;
+		}
+
+		case TSDBConstants.TSDB_DATA_TYPE_DOUBLE: {
+			DoubleBuffer lb = (DoubleBuffer) this.colData.get(col);
+			double val = lb.get(this.rowIndex);
+			if (NullType.isDoubleNull(val)) {
+				return null;
+			}
+
+			return val;
+		}
+
+		case TSDBConstants.TSDB_DATA_TYPE_BINARY: {
+			ByteBuffer bb = (ByteBuffer) this.colData.get(col);
+			bb.position(fieldSize * this.rowIndex);
+
+			int length = bb.getShort();
+
+			byte[] dest = new byte[length];
+			bb.get(dest, 0, length);
+			if (NullType.isBinaryNull(dest, length)) {
+				return null;
+			}
+
+			return new String(dest);
+		}
+
+		case TSDBConstants.TSDB_DATA_TYPE_NCHAR: {
+			ByteBuffer bb = (ByteBuffer) this.colData.get(col);
+			bb.position(fieldSize * this.rowIndex);
+
+			int length = bb.getShort();
+
+			byte[] dest = new byte[length];
+			bb.get(dest, 0, length);
+			if (NullType.isNcharNull(dest, length)) {
+				return null;
+			}
+
+			try {
+				String ss = TaosGlobalConfig.getCharset();
+				return new String(dest, ss);
+			} catch (UnsupportedEncodingException e) {
+				e.printStackTrace();
+			}
+		}
+		}
+
+		return 0;
+	}
+}

src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBResultSetRowData.java

@@ -218,5 +218,4 @@ public class TSDBResultSetRowData {
 	public void setData(ArrayList<Object> data) {
 		this.data = (ArrayList<Object>) data.clone();
 	}
-
 }

src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBStatement.java

@@ -19,7 +19,7 @@ import java.util.ArrayList;
 import java.util.List;
 
 public class TSDBStatement implements Statement {
-    private TSDBJNIConnector connecter = null;
+    private TSDBJNIConnector connector = null;
 
     /**
      * To store batched commands
@@ -45,9 +45,9 @@ public class TSDBStatement implements Statement {
         this.connection = connection;
     }
 
-    TSDBStatement(TSDBConnection connection, TSDBJNIConnector connecter) {
+    TSDBStatement(TSDBConnection connection, TSDBJNIConnector connector) {
         this.connection = connection;
-        this.connecter = connecter;
+        this.connector = connector;
         this.isClosed = false;
     }
 
@@ -65,25 +65,27 @@ public class TSDBStatement implements Statement {
         }
 
         // TODO make sure it is not a update query
-        pSql = this.connecter.executeQuery(sql);
+        pSql = this.connector.executeQuery(sql);
 
-        long resultSetPointer = this.connecter.getResultSet();
+        long resultSetPointer = this.connector.getResultSet();
 
         if (resultSetPointer == TSDBConstants.JNI_CONNECTION_NULL) {
-            this.connecter.freeResultSet(pSql);
+            this.connector.freeResultSet(pSql);
             throw new SQLException(TSDBConstants.FixErrMsg(TSDBConstants.JNI_CONNECTION_NULL));
         }
 
         // create/insert/update/delete/alter
         if (resultSetPointer == TSDBConstants.JNI_NULL_POINTER) {
-            this.connecter.freeResultSet(pSql);
+            this.connector.freeResultSet(pSql);
             return null;
         }
 
-        if (!this.connecter.isUpdateQuery(pSql)) {
-            return new TSDBResultSet(this.connecter, resultSetPointer);
+        if (!this.connector.isUpdateQuery(pSql)) {
+        	TSDBResultSet res = new TSDBResultSet(this.connector, resultSetPointer);
+            res.setBatchFetch(this.connection.getBatchFetch());
+            return res;
         } else {
-            this.connecter.freeResultSet(pSql);
+            this.connector.freeResultSet(pSql);
             return null;
         }
 
@@ -95,28 +97,28 @@ public class TSDBStatement implements Statement {
         }
 
         // TODO check if current query is update query
-        pSql = this.connecter.executeQuery(sql);
-        long resultSetPointer = this.connecter.getResultSet();
+        pSql = this.connector.executeQuery(sql);
+        long resultSetPointer = this.connector.getResultSet();
 
         if (resultSetPointer == TSDBConstants.JNI_CONNECTION_NULL) {
-            this.connecter.freeResultSet(pSql);
+            this.connector.freeResultSet(pSql);
             throw new SQLException(TSDBConstants.FixErrMsg(TSDBConstants.JNI_CONNECTION_NULL));
         }
 
-        this.affectedRows = this.connecter.getAffectedRows(pSql);
-        this.connecter.freeResultSet(pSql);
+        this.affectedRows = this.connector.getAffectedRows(pSql);
+        this.connector.freeResultSet(pSql);
 
         return this.affectedRows;
     }
 
     public String getErrorMsg(long pSql) {
-        return this.connecter.getErrMsg(pSql);
+        return this.connector.getErrMsg(pSql);
     }
 
     public void close() throws SQLException {
         if (!isClosed) {
-            if (!this.connecter.isResultsetClosed()) {
-                this.connecter.freeResultSet();
+            if (!this.connector.isResultsetClosed()) {
+                this.connector.freeResultSet();
             }
             isClosed = true;
         }
@@ -136,7 +138,7 @@ public class TSDBStatement implements Statement {
     }
 
     public void setMaxRows(int max) throws SQLException {
-        // always set maxRows to zero, meaning unlimitted rows in a resultSet
+        // always set maxRows to zero, meaning unlimited rows in a resultSet
     }
 
     public void setEscapeProcessing(boolean enable) throws SQLException {
@@ -172,15 +174,15 @@ public class TSDBStatement implements Statement {
             throw new SQLException("Invalid method call on a closed statement.");
         }
         boolean res = true;
-        pSql = this.connecter.executeQuery(sql);
-        long resultSetPointer = this.connecter.getResultSet();
+        pSql = this.connector.executeQuery(sql);
+        long resultSetPointer = this.connector.getResultSet();
 
         if (resultSetPointer == TSDBConstants.JNI_CONNECTION_NULL) {
-            this.connecter.freeResultSet(pSql);
+            this.connector.freeResultSet(pSql);
             throw new SQLException(TSDBConstants.FixErrMsg(TSDBConstants.JNI_CONNECTION_NULL));
         } else if (resultSetPointer == TSDBConstants.JNI_NULL_POINTER) {
             // no result set is retrieved
-            this.connecter.freeResultSet(pSql);
+            this.connector.freeResultSet(pSql);
             res = false;
         }
 
@@ -191,10 +193,10 @@ public class TSDBStatement implements Statement {
         if (isClosed) {
             throw new SQLException("Invalid method call on a closed statement.");
         }
-        long resultSetPointer = connecter.getResultSet();
+        long resultSetPointer = connector.getResultSet();
         TSDBResultSet resSet = null;
         if (resultSetPointer != TSDBConstants.JNI_NULL_POINTER) {
-            resSet = new TSDBResultSet(connecter, resultSetPointer);
+            resSet = new TSDBResultSet(connector, resultSetPointer);
         }
         return resSet;
     }
@@ -267,7 +269,7 @@ public class TSDBStatement implements Statement {
     }
 
     public Connection getConnection() throws SQLException {
-        if (this.connecter != null)
+        if (this.connector != null)
             return this.connection;
         throw new SQLException(TSDBConstants.UNSUPPORT_METHOD_EXCEPTIONZ_MSG);
     }

src/connector/python/linux/python2/taos/cinterface.py

@@ -18,7 +18,7 @@ def _crow_timestamp_to_python(data, num_of_rows, nbytes=None, micro=False):
         _timestamp_converter = _convert_microsecond_to_datetime
 
     if num_of_rows > 0:
-        return list(map(_timestamp_converter, ctypes.cast(data,  ctypes.POINTER(ctypes.c_long))[:abs(num_of_rows)][::-1]))
+        return list(map(_timestamp_converter, ctypes.cast(data,  ctypes.POINTER(ctypes.c_long))[:abs(num_of_rows)][::1]))
     else:
         return list(map(_timestamp_converter, ctypes.cast(data,  ctypes.POINTER(ctypes.c_long))[:abs(num_of_rows)]))
 
@@ -26,7 +26,7 @@ def _crow_bool_to_python(data, num_of_rows, nbytes=None, micro=False):
     """Function to convert C bool row to python row
     """
     if num_of_rows > 0:
-        return [ None if ele == FieldType.C_BOOL_NULL else bool(ele) for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_byte))[:abs(num_of_rows)][::-1] ]
+        return [ None if ele == FieldType.C_BOOL_NULL else bool(ele) for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_byte))[:abs(num_of_rows)][::1] ]
     else:
         return [ None if ele == FieldType.C_BOOL_NULL else bool(ele) for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_bool))[:abs(num_of_rows)] ]
 
@@ -34,7 +34,7 @@ def _crow_tinyint_to_python(data, num_of_rows, nbytes=None, micro=False):
     """Function to convert C tinyint row to python row
     """
     if num_of_rows > 0:
-        return [ None if ele == FieldType.C_TINYINT_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_byte))[:abs(num_of_rows)][::-1] ]
+        return [ None if ele == FieldType.C_TINYINT_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_byte))[:abs(num_of_rows)][::1] ]
     else:
         return [ None if ele == FieldType.C_TINYINT_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_byte))[:abs(num_of_rows)] ]
     
@@ -42,7 +42,7 @@ def _crow_smallint_to_python(data, num_of_rows, nbytes=None, micro=False):
     """Function to convert C smallint row to python row
     """
     if num_of_rows > 0:
-        return [ None if ele == FieldType.C_SMALLINT_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_short))[:abs(num_of_rows)][::-1]]
+        return [ None if ele == FieldType.C_SMALLINT_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_short))[:abs(num_of_rows)][::1]]
     else:
         return [ None if ele == FieldType.C_SMALLINT_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_short))[:abs(num_of_rows)] ]
 
@@ -50,7 +50,7 @@ def _crow_int_to_python(data, num_of_rows, nbytes=None, micro=False):
     """Function to convert C int row to python row
     """
     if num_of_rows > 0:
-        return [ None if ele == FieldType.C_INT_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_int))[:abs(num_of_rows)][::-1] ]
+        return [ None if ele == FieldType.C_INT_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_int))[:abs(num_of_rows)][::1] ]
     else:
         return [ None if ele == FieldType.C_INT_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_int))[:abs(num_of_rows)] ]
 
@@ -58,7 +58,7 @@ def _crow_bigint_to_python(data, num_of_rows, nbytes=None, micro=False):
     """Function to convert C bigint row to python row
     """
     if num_of_rows > 0:
-        return [ None if ele == FieldType.C_BIGINT_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_long))[:abs(num_of_rows)][::-1] ]
+        return [ None if ele == FieldType.C_BIGINT_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_long))[:abs(num_of_rows)][::1] ]
     else:
         return [ None if ele == FieldType.C_BIGINT_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_long))[:abs(num_of_rows)] ]
 
@@ -66,7 +66,7 @@ def _crow_float_to_python(data, num_of_rows, nbytes=None, micro=False):
     """Function to convert C float row to python row
     """
     if num_of_rows > 0:
-        return [ None if math.isnan(ele) else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_float))[:abs(num_of_rows)][::-1] ]
+        return [ None if math.isnan(ele) else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_float))[:abs(num_of_rows)][::1] ]
     else:
         return [ None if math.isnan(ele) else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_float))[:abs(num_of_rows)] ]
 
@@ -74,7 +74,7 @@ def _crow_double_to_python(data, num_of_rows, nbytes=None, micro=False):
     """Function to convert C double row to python row
     """
     if num_of_rows > 0:
-        return [ None if math.isnan(ele) else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_double))[:abs(num_of_rows)][::-1] ]
+        return [ None if math.isnan(ele) else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_double))[:abs(num_of_rows)][::1] ]
     else:
         return [ None if math.isnan(ele) else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_double))[:abs(num_of_rows)] ]
 
@@ -82,7 +82,7 @@ def _crow_binary_to_python(data, num_of_rows, nbytes=None, micro=False):
     """Function to convert C binary row to python row
     """
     if num_of_rows > 0:
-        return [ None if ele.value[0:1] == FieldType.C_BINARY_NULL else ele.value.decode('utf-8') for ele in (ctypes.cast(data,  ctypes.POINTER(ctypes.c_char * nbytes)))[:abs(num_of_rows)][::-1]]
+        return [ None if ele.value[0:1] == FieldType.C_BINARY_NULL else ele.value.decode('utf-8') for ele in (ctypes.cast(data,  ctypes.POINTER(ctypes.c_char * nbytes)))[:abs(num_of_rows)][::1]]
     else:
         return [ None if ele.value[0:1] == FieldType.C_BINARY_NULL else ele.value.decode('utf-8') for ele in (ctypes.cast(data,  ctypes.POINTER(ctypes.c_char * nbytes)))[:abs(num_of_rows)]]
 
@@ -311,29 +311,24 @@ class CTaosInterface(object):
     @staticmethod
     def fetchBlock(result, fields):
         pblock = ctypes.c_void_p(0)
-        num_of_rows = CTaosInterface.libtaos.taos_fetch_block(
-            result, ctypes.byref(pblock))
-
-        if num_of_rows == 0:
-            return None, 0
-
+        pblock = CTaosInterface.libtaos.taos_fetch_row(result)  
+        if pblock : 
+            num_of_rows = 1
             isMicro = (CTaosInterface.libtaos.taos_result_precision(result) == FieldType.C_TIMESTAMP_MICRO)
             blocks = [None] * len(fields)
             fieldL = CTaosInterface.libtaos.taos_fetch_lengths(result)
             fieldLen = [ele for ele in ctypes.cast(fieldL,  ctypes.POINTER(ctypes.c_int))[:len(fields)]]
             for i in range(len(fields)):
                 data = ctypes.cast(pblock, ctypes.POINTER(ctypes.c_void_p))[i]
-            if data == None:
-                blocks[i] = [None] * num_of_rows
-                continue
-
                 if fields[i]['type'] not in _CONVERT_FUNC:
                     raise DatabaseError("Invalid data type returned from database")
-            
+                if data is None:
+                    blocks[i] = [None]
+                else:
                     blocks[i] = _CONVERT_FUNC[fields[i]['type']](data, num_of_rows, fieldLen[i], isMicro)         
-
+        else:
+            return None, 0
         return blocks, abs(num_of_rows)
-
     @staticmethod
     def freeResult(result):
         CTaosInterface.libtaos.taos_free_result(result)

src/connector/python/linux/python2/taos/cursor.py

 from .cinterface import CTaosInterface
 from .error import *
 from .constants import FieldType
+import threading
 
 
 class TDengineCursor(object):
@@ -35,6 +36,7 @@ class TDengineCursor(object):
         self._block_iter = 0
         self._affected_rows = 0
         self._logfile = ""
+        self._threadId = threading.get_ident()
 
         if connection is not None:
             self._connection = connection
@@ -42,7 +44,7 @@ class TDengineCursor(object):
     def __iter__(self):
         return self
 
-    def next(self):
+    def __next__(self):
         if self._result is None or self._fields is None:
             raise OperationalError("Invalid use of fetch iterator")
 
@@ -137,7 +139,7 @@ class TDengineCursor(object):
         else:
             raise ProgrammingError(
                 CTaosInterface.errStr(
-                    self._result ), errno)
+                    self._result), errno)
 
     def executemany(self, operation, seq_of_parameters):
         """Prepare a database operation (query or command) and then execute it against all parameter sequences or mappings found in the sequence seq_of_parameters.
@@ -148,6 +150,8 @@ class TDengineCursor(object):
         """Fetch the next row of a query result set, returning a single sequence, or None when no more data is available.
         """
         pass
+    def fetchmany(self):
+        pass
 
     def istype(self, col, dataType):
         if (dataType.upper() == "BOOL"):
@@ -180,9 +184,6 @@ class TDengineCursor(object):
 
         return False
 
-    def fetchmany(self):
-        pass
-
     def fetchall(self):
         """Fetch all (remaining) rows of a query result, returning them as a sequence of sequences (e.g. a list of tuples). Note that the cursor's arraysize attribute can affect the performance of this operation.
         """
@@ -201,8 +202,6 @@ class TDengineCursor(object):
             self._rowcount += num_of_fields
             for i in range(len(self._fields)):
                 buffer[i].extend(block[i])
-
-
         return list(map(tuple, zip(*buffer)))
 
     def nextset(self):

src/connector/python/linux/python3/taos/cinterface.py

@@ -18,7 +18,7 @@ def _crow_timestamp_to_python(data, num_of_rows, nbytes=None, micro=False):
         _timestamp_converter = _convert_microsecond_to_datetime
 
     if num_of_rows > 0:
-        return list(map(_timestamp_converter, ctypes.cast(data,  ctypes.POINTER(ctypes.c_long))[:abs(num_of_rows)][::-1]))
+        return list(map(_timestamp_converter, ctypes.cast(data,  ctypes.POINTER(ctypes.c_long))[:abs(num_of_rows)][::1]))
     else:
         return list(map(_timestamp_converter, ctypes.cast(data,  ctypes.POINTER(ctypes.c_long))[:abs(num_of_rows)]))
 
@@ -26,7 +26,7 @@ def _crow_bool_to_python(data, num_of_rows, nbytes=None, micro=False):
     """Function to convert C bool row to python row
     """
     if num_of_rows > 0:
-        return [ None if ele == FieldType.C_BOOL_NULL else bool(ele) for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_byte))[:abs(num_of_rows)][::-1] ]
+        return [ None if ele == FieldType.C_BOOL_NULL else bool(ele) for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_byte))[:abs(num_of_rows)][::1] ]
     else:
         return [ None if ele == FieldType.C_BOOL_NULL else bool(ele) for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_bool))[:abs(num_of_rows)] ]
 
@@ -34,7 +34,7 @@ def _crow_tinyint_to_python(data, num_of_rows, nbytes=None, micro=False):
     """Function to convert C tinyint row to python row
     """
     if num_of_rows > 0:
-        return [ None if ele == FieldType.C_TINYINT_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_byte))[:abs(num_of_rows)][::-1] ]
+        return [ None if ele == FieldType.C_TINYINT_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_byte))[:abs(num_of_rows)][::1] ]
     else:
         return [ None if ele == FieldType.C_TINYINT_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_byte))[:abs(num_of_rows)] ]
     
@@ -42,7 +42,7 @@ def _crow_smallint_to_python(data, num_of_rows, nbytes=None, micro=False):
     """Function to convert C smallint row to python row
     """
     if num_of_rows > 0:
-        return [ None if ele == FieldType.C_SMALLINT_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_short))[:abs(num_of_rows)][::-1]]
+        return [ None if ele == FieldType.C_SMALLINT_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_short))[:abs(num_of_rows)][::1]]
     else:
         return [ None if ele == FieldType.C_SMALLINT_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_short))[:abs(num_of_rows)] ]
 
@@ -50,7 +50,7 @@ def _crow_int_to_python(data, num_of_rows, nbytes=None, micro=False):
     """Function to convert C int row to python row
     """
     if num_of_rows > 0:
-        return [ None if ele == FieldType.C_INT_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_int))[:abs(num_of_rows)][::-1] ]
+        return [ None if ele == FieldType.C_INT_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_int))[:abs(num_of_rows)][::1] ]
     else:
         return [ None if ele == FieldType.C_INT_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_int))[:abs(num_of_rows)] ]
 
@@ -58,7 +58,7 @@ def _crow_bigint_to_python(data, num_of_rows, nbytes=None, micro=False):
     """Function to convert C bigint row to python row
     """
     if num_of_rows > 0:
-        return [ None if ele == FieldType.C_BIGINT_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_long))[:abs(num_of_rows)][::-1] ]
+        return [ None if ele == FieldType.C_BIGINT_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_long))[:abs(num_of_rows)][::1] ]
     else:
         return [ None if ele == FieldType.C_BIGINT_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_long))[:abs(num_of_rows)] ]
 
@@ -66,7 +66,7 @@ def _crow_float_to_python(data, num_of_rows, nbytes=None, micro=False):
     """Function to convert C float row to python row
     """
     if num_of_rows > 0:
-        return [ None if math.isnan(ele) else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_float))[:abs(num_of_rows)][::-1] ]
+        return [ None if math.isnan(ele) else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_float))[:abs(num_of_rows)][::1] ]
     else:
         return [ None if math.isnan(ele) else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_float))[:abs(num_of_rows)] ]
 
@@ -74,7 +74,7 @@ def _crow_double_to_python(data, num_of_rows, nbytes=None, micro=False):
     """Function to convert C double row to python row
     """
     if num_of_rows > 0:
-        return [ None if math.isnan(ele) else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_double))[:abs(num_of_rows)][::-1] ]
+        return [ None if math.isnan(ele) else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_double))[:abs(num_of_rows)][::1] ]
     else:
         return [ None if math.isnan(ele) else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_double))[:abs(num_of_rows)] ]
 
@@ -82,7 +82,7 @@ def _crow_binary_to_python(data, num_of_rows, nbytes=None, micro=False):
     """Function to convert C binary row to python row
     """
     if num_of_rows > 0:
-        return [ None if ele.value[0:1] == FieldType.C_BINARY_NULL else ele.value.decode('utf-8') for ele in (ctypes.cast(data,  ctypes.POINTER(ctypes.c_char * nbytes)))[:abs(num_of_rows)][::-1]]
+        return [ None if ele.value[0:1] == FieldType.C_BINARY_NULL else ele.value.decode('utf-8') for ele in (ctypes.cast(data,  ctypes.POINTER(ctypes.c_char * nbytes)))[:abs(num_of_rows)][::1]]
     else:
         return [ None if ele.value[0:1] == FieldType.C_BINARY_NULL else ele.value.decode('utf-8') for ele in (ctypes.cast(data,  ctypes.POINTER(ctypes.c_char * nbytes)))[:abs(num_of_rows)]]
 
@@ -111,7 +111,7 @@ def _crow_nchar_to_python(data, num_of_rows, nbytes=None, micro=False):
     #         except ValueError:
     #             res.append(None)
     #     return res
-    #         # return [ele.value for ele in (ctypes.cast(data,  ctypes.POINTER(ctypes.c_wchar * (nbytes//4))))[:abs(num_of_rows)][::-1]]
+    #         # return [ele.value for ele in (ctypes.cast(data,  ctypes.POINTER(ctypes.c_wchar * (nbytes//4))))[:abs(num_of_rows)][::1]]
     # else:
     #     return [ele.value for ele in (ctypes.cast(data,  ctypes.POINTER(ctypes.c_wchar * (nbytes//4))))[:abs(num_of_rows)]]
 
@@ -308,32 +308,48 @@ class CTaosInterface(object):
 
         return fields
 
+    # @staticmethod
+    # def fetchBlock(result, fields):
+    #     pblock = ctypes.c_void_p(0)
+    #     num_of_rows = CTaosInterface.libtaos.taos_fetch_block(
+    #         result, ctypes.byref(pblock))
+    #     if num_of_rows == 0:
+    #         return None, 0
+
+    #     isMicro = (CTaosInterface.libtaos.taos_result_precision(result) == FieldType.C_TIMESTAMP_MICRO)
+    #     blocks = [None] * len(fields)
+    #     fieldL = CTaosInterface.libtaos.taos_fetch_lengths(result)
+    #     fieldLen = [ele for ele in ctypes.cast(fieldL,  ctypes.POINTER(ctypes.c_int))[:len(fields)]]
+    #     for i in range(len(fields)):
+    #         data = ctypes.cast(pblock, ctypes.POINTER(ctypes.c_void_p))[i]
+
+    #         if fields[i]['type'] not in _CONVERT_FUNC:
+    #             raise DatabaseError("Invalid data type returned from database")
+    #         print('====================',fieldLen[i])
+    #         blocks[i] = _CONVERT_FUNC[fields[i]['type']](data, num_of_rows, fieldLen[i], isMicro)
+
+    #     return blocks, abs(num_of_rows)
     @staticmethod
     def fetchBlock(result, fields):
         pblock = ctypes.c_void_p(0)
-        num_of_rows = CTaosInterface.libtaos.taos_fetch_block(
-            result, ctypes.byref(pblock))
-
-        if num_of_rows == 0:
-            return None, 0
-
+        pblock = CTaosInterface.libtaos.taos_fetch_row(result)  
+        if pblock : 
+            num_of_rows = 1
             isMicro = (CTaosInterface.libtaos.taos_result_precision(result) == FieldType.C_TIMESTAMP_MICRO)
             blocks = [None] * len(fields)
             fieldL = CTaosInterface.libtaos.taos_fetch_lengths(result)
             fieldLen = [ele for ele in ctypes.cast(fieldL,  ctypes.POINTER(ctypes.c_int))[:len(fields)]]
             for i in range(len(fields)):
                 data = ctypes.cast(pblock, ctypes.POINTER(ctypes.c_void_p))[i]
-            if data == None:
-                blocks[i] = [None] * num_of_rows
-                continue
-
                 if fields[i]['type'] not in _CONVERT_FUNC:
                     raise DatabaseError("Invalid data type returned from database")
-            
+                if data is None:
+                    blocks[i] = [None]
+                else:
                     blocks[i] = _CONVERT_FUNC[fields[i]['type']](data, num_of_rows, fieldLen[i], isMicro)         
-
+        else:
+            return None, 0
         return blocks, abs(num_of_rows)
-
     @staticmethod
     def freeResult(result):
         CTaosInterface.libtaos.taos_free_result(result)

src/connector/python/linux/python3/taos/cursor.py

@@ -216,7 +216,6 @@ class TDengineCursor(object):
             self._rowcount += num_of_fields
             for i in range(len(self._fields)):
                 buffer[i].extend(block[i])
-
         return list(map(tuple, zip(*buffer)))
 
     def nextset(self):

src/connector/python/windows/python2/taos/cinterface.py

@@ -18,7 +18,7 @@ def _crow_timestamp_to_python(data, num_of_rows, nbytes=None, micro=False):
         _timestamp_converter = _convert_microsecond_to_datetime
 
     if num_of_rows > 0:
-        return list(map(_timestamp_converter, ctypes.cast(data,  ctypes.POINTER(ctypes.c_longlong))[:abs(num_of_rows)][::-1]))
+        return list(map(_timestamp_converter, ctypes.cast(data,  ctypes.POINTER(ctypes.c_longlong))[:abs(num_of_rows)][::1]))
     else:
         return list(map(_timestamp_converter, ctypes.cast(data,  ctypes.POINTER(ctypes.c_longlong))[:abs(num_of_rows)]))
 
@@ -26,7 +26,7 @@ def _crow_bool_to_python(data, num_of_rows, nbytes=None, micro=False):
     """Function to convert C bool row to python row
     """
     if num_of_rows > 0:
-        return [ None if ele == FieldType.C_BOOL_NULL else bool(ele) for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_byte))[:abs(num_of_rows)][::-1] ]
+        return [ None if ele == FieldType.C_BOOL_NULL else bool(ele) for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_byte))[:abs(num_of_rows)][::1] ]
     else:
         return [ None if ele == FieldType.C_BOOL_NULL else bool(ele) for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_bool))[:abs(num_of_rows)] ]
 
@@ -34,7 +34,7 @@ def _crow_tinyint_to_python(data, num_of_rows, nbytes=None, micro=False):
     """Function to convert C tinyint row to python row
     """
     if num_of_rows > 0:
-        return [ None if ele == FieldType.C_TINYINT_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_byte))[:abs(num_of_rows)][::-1] ]
+        return [ None if ele == FieldType.C_TINYINT_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_byte))[:abs(num_of_rows)][::1] ]
     else:
         return [ None if ele == FieldType.C_TINYINT_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_byte))[:abs(num_of_rows)] ]
     
@@ -42,7 +42,7 @@ def _crow_smallint_to_python(data, num_of_rows, nbytes=None, micro=False):
     """Function to convert C smallint row to python row
     """
     if num_of_rows > 0:
-        return [ None if ele == FieldType.C_SMALLINT_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_short))[:abs(num_of_rows)][::-1]]
+        return [ None if ele == FieldType.C_SMALLINT_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_short))[:abs(num_of_rows)][::1]]
     else:
         return [ None if ele == FieldType.C_SMALLINT_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_short))[:abs(num_of_rows)] ]
 
@@ -50,7 +50,7 @@ def _crow_int_to_python(data, num_of_rows, nbytes=None, micro=False):
     """Function to convert C int row to python row
     """
     if num_of_rows > 0:
-        return [ None if ele == FieldType.C_INT_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_int))[:abs(num_of_rows)][::-1] ]
+        return [ None if ele == FieldType.C_INT_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_int))[:abs(num_of_rows)][::1] ]
     else:
         return [ None if ele == FieldType.C_INT_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_int))[:abs(num_of_rows)] ]
 
@@ -58,7 +58,7 @@ def _crow_bigint_to_python(data, num_of_rows, nbytes=None, micro=False):
     """Function to convert C bigint row to python row
     """
     if num_of_rows > 0:
-        return [ None if ele == FieldType.C_BIGINT_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_longlong))[:abs(num_of_rows)][::-1] ]
+        return [ None if ele == FieldType.C_BIGINT_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_longlong))[:abs(num_of_rows)][::1] ]
     else:
         return [ None if ele == FieldType.C_BIGINT_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_longlong))[:abs(num_of_rows)] ]
 
@@ -66,7 +66,7 @@ def _crow_float_to_python(data, num_of_rows, nbytes=None, micro=False):
     """Function to convert C float row to python row
     """
     if num_of_rows > 0:
-        return [ None if math.isnan(ele) else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_float))[:abs(num_of_rows)][::-1] ]
+        return [ None if math.isnan(ele) else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_float))[:abs(num_of_rows)][::1] ]
     else:
         return [ None if math.isnan(ele) else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_float))[:abs(num_of_rows)] ]
 
@@ -74,7 +74,7 @@ def _crow_double_to_python(data, num_of_rows, nbytes=None, micro=False):
     """Function to convert C double row to python row
     """
     if num_of_rows > 0:
-        return [ None if math.isnan(ele) else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_double))[:abs(num_of_rows)][::-1] ]
+        return [ None if math.isnan(ele) else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_double))[:abs(num_of_rows)][::1] ]
     else:
         return [ None if math.isnan(ele) else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_double))[:abs(num_of_rows)] ]
 
@@ -82,7 +82,7 @@ def _crow_binary_to_python(data, num_of_rows, nbytes=None, micro=False):
     """Function to convert C binary row to python row
     """
     if num_of_rows > 0:
-        return [ None if ele.value[0:1] == FieldType.C_BINARY_NULL else ele.value.decode('utf-8') for ele in (ctypes.cast(data,  ctypes.POINTER(ctypes.c_char * nbytes)))[:abs(num_of_rows)][::-1]]
+        return [ None if ele.value[0:1] == FieldType.C_BINARY_NULL else ele.value.decode('utf-8') for ele in (ctypes.cast(data,  ctypes.POINTER(ctypes.c_char * nbytes)))[:abs(num_of_rows)][::1]]
     else:
         return [ None if ele.value[0:1] == FieldType.C_BINARY_NULL else ele.value.decode('utf-8') for ele in (ctypes.cast(data,  ctypes.POINTER(ctypes.c_char * nbytes)))[:abs(num_of_rows)]]
 
@@ -310,27 +310,23 @@ class CTaosInterface(object):
     @staticmethod
     def fetchBlock(result, fields):
         pblock = ctypes.c_void_p(0)
-        num_of_rows = CTaosInterface.libtaos.taos_fetch_block(
-            result, ctypes.byref(pblock))
-
-        if num_of_rows == 0:
-            return None, 0
-
+        pblock = CTaosInterface.libtaos.taos_fetch_row(result)  
+        if pblock : 
+            num_of_rows = 1
             isMicro = (CTaosInterface.libtaos.taos_result_precision(result) == FieldType.C_TIMESTAMP_MICRO)
             blocks = [None] * len(fields)
             fieldL = CTaosInterface.libtaos.taos_fetch_lengths(result)
             fieldLen = [ele for ele in ctypes.cast(fieldL,  ctypes.POINTER(ctypes.c_int))[:len(fields)]]
             for i in range(len(fields)):
                 data = ctypes.cast(pblock, ctypes.POINTER(ctypes.c_void_p))[i]
-            if data == None:
-                blocks[i] = [None] * num_of_rows
-                continue
-
                 if fields[i]['type'] not in _CONVERT_FUNC:
                     raise DatabaseError("Invalid data type returned from database")
-            
+                if data is None:
+                    blocks[i] = [None]
+                else:
                     blocks[i] = _CONVERT_FUNC[fields[i]['type']](data, num_of_rows, fieldLen[i], isMicro)         
-
+        else:
+            return None, 0
         return blocks, abs(num_of_rows)
 
     @staticmethod

src/connector/python/windows/python2/taos/cursor.py

 from .cinterface import CTaosInterface
 from .error import *
+from .constants import FieldType
+import threading
+
+# querySeqNum = 0
 
 class TDengineCursor(object):
     """Database cursor which is used to manage the context of a fetch operation.
@@ -32,6 +36,8 @@ class TDengineCursor(object):
         self._block_rows = -1
         self._block_iter = 0
         self._affected_rows = 0
+        self._logfile = ""
+        self._threadId = threading.get_ident()
 
         if connection is not None:
             self._connection = connection
@@ -39,7 +45,7 @@ class TDengineCursor(object):
     def __iter__(self):
         return self
 
-    def next(self):
+    def __next__(self):
         if self._result is None or self._fields is None:
             raise OperationalError("Invalid use of fetch iterator")
 

src/connector/python/windows/python3/taos/cinterface.py

@@ -18,7 +18,7 @@ def _crow_timestamp_to_python(data, num_of_rows, nbytes=None, micro=False):
         _timestamp_converter = _convert_microsecond_to_datetime
 
     if num_of_rows > 0:
-        return list(map(_timestamp_converter, ctypes.cast(data,  ctypes.POINTER(ctypes.c_longlong))[:abs(num_of_rows)][::-1]))
+        return list(map(_timestamp_converter, ctypes.cast(data,  ctypes.POINTER(ctypes.c_longlong))[:abs(num_of_rows)][::1]))
     else:
         return list(map(_timestamp_converter, ctypes.cast(data,  ctypes.POINTER(ctypes.c_longlong))[:abs(num_of_rows)]))
 
@@ -26,7 +26,7 @@ def _crow_bool_to_python(data, num_of_rows, nbytes=None, micro=False):
     """Function to convert C bool row to python row
     """
     if num_of_rows > 0:
-        return [ None if ele == FieldType.C_BOOL_NULL else bool(ele) for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_byte))[:abs(num_of_rows)][::-1] ]
+        return [ None if ele == FieldType.C_BOOL_NULL else bool(ele) for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_byte))[:abs(num_of_rows)][::1] ]
     else:
         return [ None if ele == FieldType.C_BOOL_NULL else bool(ele) for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_bool))[:abs(num_of_rows)] ]
 
@@ -34,7 +34,7 @@ def _crow_tinyint_to_python(data, num_of_rows, nbytes=None, micro=False):
     """Function to convert C tinyint row to python row
     """
     if num_of_rows > 0:
-        return [ None if ele == FieldType.C_TINYINT_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_byte))[:abs(num_of_rows)][::-1] ]
+        return [ None if ele == FieldType.C_TINYINT_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_byte))[:abs(num_of_rows)][::1] ]
     else:
         return [ None if ele == FieldType.C_TINYINT_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_byte))[:abs(num_of_rows)] ]
     
@@ -42,7 +42,7 @@ def _crow_smallint_to_python(data, num_of_rows, nbytes=None, micro=False):
     """Function to convert C smallint row to python row
     """
     if num_of_rows > 0:
-        return [ None if ele == FieldType.C_SMALLINT_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_short))[:abs(num_of_rows)][::-1]]
+        return [ None if ele == FieldType.C_SMALLINT_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_short))[:abs(num_of_rows)][::1]]
     else:
         return [ None if ele == FieldType.C_SMALLINT_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_short))[:abs(num_of_rows)] ]
 
@@ -50,7 +50,7 @@ def _crow_int_to_python(data, num_of_rows, nbytes=None, micro=False):
     """Function to convert C int row to python row
     """
     if num_of_rows > 0:
-        return [ None if ele == FieldType.C_INT_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_int))[:abs(num_of_rows)][::-1] ]
+        return [ None if ele == FieldType.C_INT_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_int))[:abs(num_of_rows)][::1] ]
     else:
         return [ None if ele == FieldType.C_INT_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_int))[:abs(num_of_rows)] ]
 
@@ -58,7 +58,7 @@ def _crow_bigint_to_python(data, num_of_rows, nbytes=None, micro=False):
     """Function to convert C bigint row to python row
     """
     if num_of_rows > 0:
-        return [ None if ele == FieldType.C_BIGINT_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_longlong))[:abs(num_of_rows)][::-1] ]
+        return [ None if ele == FieldType.C_BIGINT_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_longlong))[:abs(num_of_rows)][::1] ]
     else:
         return [ None if ele == FieldType.C_BIGINT_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_longlong))[:abs(num_of_rows)] ]
 
@@ -66,7 +66,7 @@ def _crow_float_to_python(data, num_of_rows, nbytes=None, micro=False):
     """Function to convert C float row to python row
     """
     if num_of_rows > 0:
-        return [ None if math.isnan(ele) else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_float))[:abs(num_of_rows)][::-1] ]
+        return [ None if math.isnan(ele) else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_float))[:abs(num_of_rows)][::1] ]
     else:
         return [ None if math.isnan(ele) else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_float))[:abs(num_of_rows)] ]
 
@@ -74,7 +74,7 @@ def _crow_double_to_python(data, num_of_rows, nbytes=None, micro=False):
     """Function to convert C double row to python row
     """
     if num_of_rows > 0:
-        return [ None if math.isnan(ele) else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_double))[:abs(num_of_rows)][::-1] ]
+        return [ None if math.isnan(ele) else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_double))[:abs(num_of_rows)][::1] ]
     else:
         return [ None if math.isnan(ele) else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_double))[:abs(num_of_rows)] ]
 
@@ -82,7 +82,7 @@ def _crow_binary_to_python(data, num_of_rows, nbytes=None, micro=False):
     """Function to convert C binary row to python row
     """
     if num_of_rows > 0:
-        return [ None if ele.value[0:1] == FieldType.C_BINARY_NULL else ele.value.decode('utf-8') for ele in (ctypes.cast(data,  ctypes.POINTER(ctypes.c_char * nbytes)))[:abs(num_of_rows)][::-1]]
+        return [ None if ele.value[0:1] == FieldType.C_BINARY_NULL else ele.value.decode('utf-8') for ele in (ctypes.cast(data,  ctypes.POINTER(ctypes.c_char * nbytes)))[:abs(num_of_rows)][::1]]
     else:
         return [ None if ele.value[0:1] == FieldType.C_BINARY_NULL else ele.value.decode('utf-8') for ele in (ctypes.cast(data,  ctypes.POINTER(ctypes.c_char * nbytes)))[:abs(num_of_rows)]]
 
@@ -225,6 +225,7 @@ class CTaosInterface(object):
 
         if connection.value == None:
             print('connect to TDengine failed')
+            raise ConnectionError("connect to TDengine failed")
             # sys.exit(1)
         else:
             print('connect to TDengine success')
@@ -310,27 +311,23 @@ class CTaosInterface(object):
     @staticmethod
     def fetchBlock(result, fields):
         pblock = ctypes.c_void_p(0)
-        num_of_rows = CTaosInterface.libtaos.taos_fetch_block(
-            result, ctypes.byref(pblock))
-
-        if num_of_rows == 0:
-            return None, 0
-
+        pblock = CTaosInterface.libtaos.taos_fetch_row(result)  
+        if pblock : 
+            num_of_rows = 1
             isMicro = (CTaosInterface.libtaos.taos_result_precision(result) == FieldType.C_TIMESTAMP_MICRO)
             blocks = [None] * len(fields)
             fieldL = CTaosInterface.libtaos.taos_fetch_lengths(result)
             fieldLen = [ele for ele in ctypes.cast(fieldL,  ctypes.POINTER(ctypes.c_int))[:len(fields)]]
             for i in range(len(fields)):
                 data = ctypes.cast(pblock, ctypes.POINTER(ctypes.c_void_p))[i]
-            if data == None:
-                blocks[i] = [None] * num_of_rows
-                continue
-
                 if fields[i]['type'] not in _CONVERT_FUNC:
                     raise DatabaseError("Invalid data type returned from database")
-            
+                if data is None:
+                    blocks[i] = [None]
+                else:
                     blocks[i] = _CONVERT_FUNC[fields[i]['type']](data, num_of_rows, fieldLen[i], isMicro)         
-
+        else:
+            return None, 0
         return blocks, abs(num_of_rows)
 
     @staticmethod

src/connector/python/windows/python3/taos/cursor.py

 from .cinterface import CTaosInterface
 from .error import *
+from .constants import FieldType
+import threading
+
+# querySeqNum = 0
+
 
 class TDengineCursor(object):
     """Database cursor which is used to manage the context of a fetch operation.
@@ -32,6 +37,8 @@ class TDengineCursor(object):
         self._block_rows = -1
         self._block_iter = 0
         self._affected_rows = 0
+        self._logfile = ""
+        self._threadId = threading.get_ident()
 
         if connection is not None:
             self._connection = connection

src/inc/taos.h

@@ -17,6 +17,7 @@
 #define TDENGINE_TAOS_H
 
 #include <stdint.h>
+#include <stdbool.h>
 
 #ifdef __cplusplus
 extern "C" {
@@ -109,13 +110,14 @@ DLL_EXPORT TAOS_RES *taos_query(TAOS *taos, const char *sql);
 DLL_EXPORT TAOS_ROW taos_fetch_row(TAOS_RES *res);
 DLL_EXPORT int taos_result_precision(TAOS_RES *res);  // get the time precision of result
 DLL_EXPORT void taos_free_result(TAOS_RES *res);
-DLL_EXPORT int taos_field_count(TAOS_RES *tres);
+DLL_EXPORT int taos_field_count(TAOS_RES *res);
 DLL_EXPORT int taos_num_fields(TAOS_RES *res);
 DLL_EXPORT int taos_affected_rows(TAOS_RES *res);
 DLL_EXPORT TAOS_FIELD *taos_fetch_fields(TAOS_RES *res);
 DLL_EXPORT int taos_select_db(TAOS *taos, const char *db);
 DLL_EXPORT int taos_print_row(char *str, TAOS_ROW row, TAOS_FIELD *fields, int num_fields);
 DLL_EXPORT void taos_stop_query(TAOS_RES *res);
+DLL_EXPORT bool taos_is_null(TAOS_RES *res, int32_t row, int32_t col);
 
 int taos_fetch_block(TAOS_RES *res, TAOS_ROW *rows);
 int taos_validate_sql(TAOS *taos, const char *sql);

src/query/src/qExecutor.c

@@ -847,18 +847,32 @@ static int32_t getNextQualifiedWindow(SQueryRuntimeEnv *pRuntimeEnv, STimeWindow
   }
 
   int32_t startPos = 0;
+
   // tumbling time window query, a special case of sliding time window query
   if (pQuery->interval.sliding == pQuery->interval.interval && prevPosition != -1) {
     int32_t factor = GET_FORWARD_DIRECTION_FACTOR(pQuery->order.order);
     startPos = prevPosition + factor;
+  } else {
+    if (startKey < pDataBlockInfo->window.skey && QUERY_IS_ASC_QUERY(pQuery)) {
+      startPos = 0;
+    } else if (startKey > pDataBlockInfo->window.ekey && !QUERY_IS_ASC_QUERY(pQuery)) {
+      startPos = pDataBlockInfo->rows - 1;
     } else {
       startPos = searchFn((char *)primaryKeys, pDataBlockInfo->rows, startKey, pQuery->order.order);
     }
+  }
 
   /*
    * This time window does not cover any data, try next time window,
    * this case may happen when the time window is too small
    */
+  if (primaryKeys == NULL) {
+    if (QUERY_IS_ASC_QUERY(pQuery)) {
+      assert(pDataBlockInfo->window.skey <= pNext->ekey);
+    } else {
+      assert(pDataBlockInfo->window.ekey >= pNext->skey);
+    }
+  } else {
     if (QUERY_IS_ASC_QUERY(pQuery) && primaryKeys[startPos] > pNext->ekey) {
       TSKEY next = primaryKeys[startPos];
       if (pQuery->interval.intervalUnit == 'n' || pQuery->interval.intervalUnit == 'y') {
@@ -878,6 +892,7 @@ static int32_t getNextQualifiedWindow(SQueryRuntimeEnv *pRuntimeEnv, STimeWindow
         pNext->ekey = pNext->skey + pQuery->interval.interval - 1;
       }
     }
+  }
 
   return startPos;
 }

rust @ f2ffd305

-Subproject commit f2ffd30521b8e8afbc9d25c75f8eeeb6a48bd030

tests/script/general/parser/alter.sim

@@ -4,7 +4,7 @@ system sh/deploy.sh -n dnode1 -i 1
 system sh/cfg.sh -n dnode1 -c walLevel -v 0
 system sh/cfg.sh -n dnode1 -c tableMetaKeepTimer -v 3
 system sh/exec.sh -n dnode1 -s start
-sleep 3000
+sleep 1000
 sql connect
 
 $dbPrefix = m_alt_db
@@ -56,6 +56,7 @@ if $rows != 2 then
 endi
 print data03 = $data03
 if $data03 != taos then
+  print expect taos, actual: $data03
   return -1
 endi
 sql drop table tb
@@ -113,7 +114,7 @@ endi
 sql drop table tb
 sql drop table mt
 
-sleep 3000
+sleep 1000
 ### ALTER TABLE WHILE STREAMING [TBASE271]
 #sql create table tb1 (ts timestamp, c1 int, c2 nchar(5), c3 int)
 #sql create table strm as select count(*), avg(c1), first(c2), sum(c3) from tb1 interval(2s)
@@ -146,7 +147,7 @@ sleep 3000
 #sql alter table tb1 add column c3 int
 #sleep 6000
 #sql insert into tb1 values (now, 3, 'taos', 3);
-#sleep 3000
+#sleep 1000
 #sql select * from strm
 #if $rows != 3 then
 #   return -1
@@ -185,7 +186,7 @@ sql create database $db
 sql use $db
 sql create table mt (ts timestamp, c1 int, c2 nchar(7), c3 int) tags (t1 int)
 sql create table tb using mt tags(1)
-sleep 3000
+sleep 1000
 sql insert into tb values ('2018-11-01 16:30:00.000', 1, 'insert', 1)
 sql alter table mt drop column c3
 

tests/script/general/parser/alter1.sim

@@ -3,7 +3,7 @@ system sh/stop_dnodes.sh
 system sh/deploy.sh -n dnode1 -i 1
 system sh/cfg.sh -n dnode1 -c walLevel -v 0
 system sh/exec.sh -n dnode1 -s start
-sleep 3000
+sleep 1000
 sql connect
 sql reset query cache
 
@@ -87,7 +87,7 @@ if $data13 != NULL then
   return -1
 endi
 
-sleep 3000
+sleep 1000
 print ================== insert values into table
 sql insert into car1 values (now, 1, 1,1 ) (now +1s, 2,2,2,) car2 values (now, 1,3,3)
 

tests/script/general/parser/alter_stable.sim

@@ -4,7 +4,7 @@ system sh/deploy.sh -n dnode1 -i 1
 system sh/cfg.sh -n dnode1 -c walLevel -v 0
 system sh/cfg.sh -n dnode1 -c tableMetaKeepTimer -v 3
 system sh/exec.sh -n dnode1 -s start
-sleep 3000
+sleep 1000
 sql connect
 
 print ========== alter_stable.sim

tests/script/general/parser/auto_create_tb.sim

@@ -4,7 +4,7 @@ system sh/cfg.sh -n dnode1 -c walLevel -v 0
 system sh/cfg.sh -n dnode1 -c maxtablesPerVnode -v 2
 system sh/exec.sh -n dnode1 -s start
 
-sleep 3000
+sleep 1000
 sql connect
 print ======================== dnode1 start
 
@@ -212,7 +212,7 @@ sleep 5000
 system sh/exec.sh -n dnode1 -s start
 print ================== server restart completed
 sql connect
-sleep 3000
+sleep 1000
 sql use $db
 
 #### auto create multiple tables

tests/script/general/parser/auto_create_tb_drop_tb.sim

@@ -4,7 +4,7 @@ system sh/cfg.sh -n dnode1 -c walLevel -v 1
 system sh/cfg.sh -n dnode1 -c maxTablesPerVnode -v 4
 system sh/cfg.sh -n dnode1 -c ctime -v 30
 system sh/exec.sh -n dnode1 -s start
-sleep 3000
+sleep 1000
 sql connect
 
 $dbPrefix = db

tests/script/general/parser/binary_escapeCharacter.sim

@@ -4,7 +4,7 @@ system sh/deploy.sh -n dnode1 -i 1
 system sh/cfg.sh -n dnode1 -c walLevel -v 0
 system sh/cfg.sh -n dnode1 -c tableMetaKeepTimer -v 3
 system sh/exec.sh -n dnode1 -s start
-sleep 3000
+sleep 1000
 sql connect
 
 sql drop database if exists ecdb

tests/script/general/parser/col_arithmetic_operation.sim

@@ -3,7 +3,7 @@ system sh/stop_dnodes.sh
 system sh/deploy.sh -n dnode1 -i 1
 system sh/cfg.sh -n dnode1 -c walLevel -v 0
 system sh/exec.sh -n dnode1 -s start
-sleep 3000
+sleep 1000
 sql connect
 
 $dbPrefix = ca_db

tests/script/general/parser/columnValue.sim

@@ -5,7 +5,7 @@ system sh/deploy.sh -n dnode1 -i 1
 system sh/cfg.sh -n dnode1 -c walLevel -v 0
 system sh/cfg.sh -n dnode1 -c tableMetaKeepTimer -v 3
 system sh/exec.sh -n dnode1 -s start
-sleep 3000
+sleep 1000
 sql connect
 
 print ========== columnValues.sim

tests/script/general/parser/columnValue_bigint.sim

-sleep 3000
+sleep 1000
 sql connect
 sql create database if not exists db
 sql use db

tests/script/general/parser/columnValue_bool.sim

-sleep 3000
+sleep 1000
 sql connect
 sql create database if not exists db
 sql use db

tests/script/general/parser/columnValue_double.sim

 ####
-sleep 3000
+sleep 1000
 sql connect
 sql create database if not exists db
 sql use db

tests/script/general/parser/columnValue_float.sim

 ####
-sleep 3000
+sleep 1000
 sql connect
 sql create database if not exists db
 sql use db

tests/script/general/parser/columnValue_int.sim

-sleep 3000
+sleep 1000
 sql connect
 sql create database if not exists db
 sql use db

tests/script/general/parser/columnValue_smallint.sim

-sleep 3000
+sleep 1000
 sql connect
 sql create database if not exists db
 sql use db

tests/script/general/parser/columnValue_tinyint.sim

-sleep 3000
+sleep 1000
 sql connect
 sql create database if not exists db
 sql use db

tests/script/general/parser/commit.sim

@@ -4,7 +4,7 @@ system sh/deploy.sh -n dnode1 -i 1
 system sh/cfg.sh -n dnode1 -c walLevel -v 0
 system sh/cfg.sh -n dnode1 -c maxTablesperVnode -v 100
 system sh/exec.sh -n dnode1 -s start
-sleep 3000
+sleep 1000
 sql connect
 
 $dbPrefix = sc_db
@@ -85,10 +85,10 @@ print ================== restart server to commit data into disk
 system sh/exec.sh -n dnode1 -s stop -x SIGINT
 sleep 5000
 system sh/exec.sh -n dnode1 -s start
-sleep 3000
+sleep 1000
 print ================== server restart completed
 sql connect
-sleep 3000
+sleep 1000
 
 print ====== select from table and check num of rows returned
 sql use $db

tests/script/general/parser/create_db.sim

@@ -5,7 +5,7 @@ system sh/deploy.sh -n dnode1 -i 1
 system sh/cfg.sh -n dnode1 -c walLevel -v 0
 system sh/exec.sh -n dnode1 -s start
 
-sleep 3000
+sleep 1000
 sql connect
 print ======================== dnode1 start
 

tests/script/general/parser/create_mt.sim

@@ -5,7 +5,7 @@ system sh/deploy.sh -n dnode1 -i 1
 system sh/cfg.sh -n dnode1 -c walLevel -v 0
 system sh/exec.sh -n dnode1 -s start
 
-sleep 3000
+sleep 1000
 sql connect
 print ======================== dnode1 start
 

tests/script/general/parser/create_tb.sim

@@ -5,7 +5,7 @@ system sh/deploy.sh -n dnode1 -i 1
 system sh/cfg.sh -n dnode1 -c walLevel -v 0
 system sh/exec.sh -n dnode1 -s start
 
-sleep 3000
+sleep 1000
 sql connect
 print ======================== dnode1 start
 

tests/script/general/parser/fill.sim

@@ -3,7 +3,7 @@ system sh/stop_dnodes.sh
 system sh/deploy.sh -n dnode1 -i 1
 system sh/cfg.sh -n dnode1 -c walLevel -v 0
 system sh/exec.sh -n dnode1 -s start
-sleep 3000
+sleep 1000
 sql connect
 
 $dbPrefix = m_fl_db

tests/script/general/parser/fill_stb.sim

@@ -3,7 +3,7 @@ system sh/stop_dnodes.sh
 system sh/deploy.sh -n dnode1 -i 1
 system sh/cfg.sh -n dnode1 -c walLevel -v 0
 system sh/exec.sh -n dnode1 -s start
-sleep 3000
+sleep 1000
 sql connect
 
 $dbPrefix = fl1_db

tests/script/general/parser/fill_us.sim

@@ -3,7 +3,7 @@ system sh/stop_dnodes.sh
 system sh/deploy.sh -n dnode1 -i 1
 system sh/cfg.sh -n dnode1 -c walLevel -v 0
 system sh/exec.sh -n dnode1 -s start
-sleep 3000
+sleep 1000
 sql connect
 
 $dbPrefix = m_fl_db

tests/script/general/parser/first_last.sim

@@ -4,7 +4,7 @@ system sh/deploy.sh -n dnode1 -i 1
 system sh/cfg.sh -n dnode1 -c walLevel -v 0
 system sh/cfg.sh -n dnode1 -c maxTablespervnode -v 4
 system sh/exec.sh -n dnode1 -s start
-sleep 3000
+sleep 1000
 sql connect
 
 $dbPrefix = first_db
@@ -80,7 +80,7 @@ sleep 5000
 system sh/exec.sh -n dnode1 -s start
 print ================== server restart completed
 sql connect
-sleep 3000
+sleep 1000
 
 run general/parser/first_last_query.sim
 

tests/script/general/parser/first_last_query.sim

-sleep 3000
+sleep 1000
 sql connect
 
 $dbPrefix = first_db

tests/script/general/parser/import.sim

@@ -3,7 +3,7 @@ system sh/stop_dnodes.sh
 system sh/deploy.sh -n dnode1 -i 1
 system sh/cfg.sh -n dnode1 -c walLevel -v 0
 system sh/exec.sh -n dnode1 -s start
-sleep 3000
+sleep 1000
 sql connect
 
 $dbPrefix = impt_db
@@ -64,7 +64,7 @@ sleep 2000
 system sh/exec.sh -n dnode1 -s start
 print ================== server restart completed
 sql connect
-sleep 3000
+sleep 1000
 
 sql use $db
 sql select * from tb

tests/script/general/parser/import_commit1.sim

@@ -4,7 +4,7 @@ system sh/deploy.sh -n dnode1 -i 1
 system sh/cfg.sh -n dnode1 -c walLevel -v 1
 system sh/cfg.sh -n dnode1 -c ctime -v 30
 system sh/exec.sh -n dnode1 -s start
-sleep 3000
+sleep 1000
 sql connect
 
 $dbPrefix = ic_db

tests/script/general/parser/import_commit2.sim

@@ -4,7 +4,7 @@ system sh/deploy.sh -n dnode1 -i 1
 system sh/cfg.sh -n dnode1 -c walLevel -v 1
 system sh/cfg.sh -n dnode1 -c ctime -v 30
 system sh/exec.sh -n dnode1 -s start
-sleep 3000
+sleep 1000
 sql connect
 
 $dbPrefix = ic_db

tests/script/general/parser/import_commit3.sim

@@ -4,7 +4,7 @@ system sh/deploy.sh -n dnode1 -i 1
 system sh/cfg.sh -n dnode1 -c walLevel -v 1
 system sh/cfg.sh -n dnode1 -c ctime -v 30
 system sh/exec.sh -n dnode1 -s start
-sleep 3000
+sleep 1000
 sql connect
 
 $dbPrefix = ic_db

tests/script/general/parser/insert_multiTbl.sim

@@ -6,7 +6,7 @@ system sh/cfg.sh -n dnode1 -c walLevel -v 0
 system sh/exec.sh -n dnode1 -s start
 sleep 2000
 sql connect
-sleep 3000
+sleep 1000
 print ======================== dnode1 start
 
 sql create database mul_db

tests/script/general/parser/insert_tb.sim

@@ -5,7 +5,7 @@ system sh/deploy.sh -n dnode1 -i 1
 system sh/cfg.sh -n dnode1 -c walLevel -v 0
 system sh/exec.sh -n dnode1 -s start
 
-sleep 3000
+sleep 1000
 sql connect
 print ======================== dnode1 start
 

tests/script/general/parser/interp.sim

@@ -3,7 +3,7 @@ system sh/stop_dnodes.sh
 system sh/deploy.sh -n dnode1 -i 1
 system sh/cfg.sh -n dnode1 -c walLevel -v 0
 system sh/exec.sh -n dnode1 -s start
-sleep 3000
+sleep 1000
 sql connect
 
 $dbPrefix = intp_db

tests/script/general/parser/interp_test.sim

-sleep 3000
+sleep 1000
 sql connect
 
 $dbPrefix = intp_db
@@ -303,6 +303,8 @@ $tb = $tbPrefix . 0
     return -1
   endi
 
+  print select interp(ts), interp(c1), interp(c2), interp(c3), interp(c4), interp(c5), interp(c6), interp(c7), interp(c8), interp(c9) from $tb where ts = $ts0 fill(linear)
+
   sql select interp(ts), interp(c1), interp(c2), interp(c3), interp(c4), interp(c5), interp(c6), interp(c7), interp(c8), interp(c9) from $tb where ts = $ts0 fill(linear)
   if $rows != 1 then
     return -1
@@ -338,6 +340,8 @@ $tb = $tbPrefix . 0
     return -1
   endi
   # columns contain NULL values
+
+  print select interp(ts), interp(c1), interp(c2), interp(c3), interp(c4), interp(c5), interp(c6), interp(c7), interp(c8), interp(c9) from intp_tb3 where ts = $ts0 fill(linear)
   sql select interp(ts), interp(c1), interp(c2), interp(c3), interp(c4), interp(c5), interp(c6), interp(c7), interp(c8), interp(c9) from intp_tb3 where ts = $ts0 fill(linear)
   if $rows != 1 then
     return -1
@@ -380,6 +384,7 @@ $tb = $tbPrefix . 0
   endi
 
   $t = $tsu + 1000
+  print select interp(ts), interp(c1), interp(c2), interp(c3), interp(c4), interp(c5), interp(c6), interp(c7), interp(c8), interp(c9) from $tb where ts = $t fill(linear)
   sql select interp(ts), interp(c1), interp(c2), interp(c3), interp(c4), interp(c5), interp(c6), interp(c7), interp(c8), interp(c9) from $tb where ts = $t fill(linear)
   if $rows != 0 then
     return -1
@@ -387,6 +392,7 @@ $tb = $tbPrefix . 0
 
 ## fill(value)
   $t = $ts0 + 1000
+  print 91
   sql select interp(ts), interp(c1), interp(c2), interp(c3), interp(c4), interp(c5), interp(c6), interp(c7), interp(c8), interp(c9) from $tb where ts = $t fill(value, -1, -2)
   if $rows != 1 then
     return -1
@@ -456,6 +462,7 @@ $tb = $tbPrefix . 0
   if $data09 != nchar0 then
     return -1
   endi
+
   # table has NULL columns
   sql select interp(ts), interp(c1), interp(c2), interp(c3), interp(c4), interp(c5), interp(c6), interp(c7), interp(c8), interp(c9) from intp_tb3 where ts = $ts0 fill(value, -1, -2, -3)
   if $rows != 1 then
@@ -491,11 +498,14 @@ $tb = $tbPrefix . 0
 
 ##### select interp from stable
   ## interp(*) from stb
+  print select interp(*) from $stb where ts = $ts0
   sql select interp(*) from $stb where ts = $ts0
   if $rows != 1 then
     return -1
   endi
   $t = $ts0 + 1000
+  print 92
+
   sql select interp(*) from $stb where ts = $t
   if $rows != 0 then
     return -1

tests/script/general/parser/join.sim

@@ -360,9 +360,7 @@ endi
 sql select join_mt1.* from join_mt1
 
 print $rows
-
-$val = 2000
-if $rows != $val then
+if $rows != 2000 then
   return -1
 endi
 

tests/script/general/parser/lastrow.sim

@@ -4,7 +4,7 @@ system sh/deploy.sh -n dnode1 -i 1
 system sh/cfg.sh -n dnode1 -c walLevel -v 0
 system sh/cfg.sh -n dnode1 -c maxtablespervnode -v 4
 system sh/exec.sh -n dnode1 -s start
-sleep 3000
+sleep 1000
 sql connect
 
 $dbPrefix = lr_db
@@ -66,7 +66,7 @@ sleep 5000
 system sh/exec.sh -n dnode1 -s start
 print ================== server restart completed
 sql connect
-sleep 3000
+sleep 1000
 
 run general/parser/lastrow_query.sim
 

tests/script/general/parser/lastrow_query.sim

-sleep 3000
+sleep 1000
 sql connect
 
 $dbPrefix = lr_db

tests/script/general/parser/limit.sim

@@ -4,7 +4,7 @@ system sh/deploy.sh -n dnode1 -i 1
 system sh/cfg.sh -n dnode1 -c walLevel -v 0
 system sh/cfg.sh -n dnode1 -c maxVgroupsPerDb -v 1
 system sh/exec.sh -n dnode1 -s start
-sleep 3000
+sleep 1000
 sql connect
 
 $dbPrefix = lm_db
@@ -66,7 +66,7 @@ sleep 5000
 system sh/exec.sh -n dnode1 -s start
 print ================== server restart completed
 sql connect
-sleep 3000
+sleep 1000
 
 run general/parser/limit_tb.sim
 run general/parser/limit_stb.sim

tests/script/general/parser/limit1.sim

@@ -4,7 +4,7 @@ system sh/deploy.sh -n dnode1 -i 1
 system sh/cfg.sh -n dnode1 -c walLevel -v 0
 system sh/cfg.sh -n dnode1 -c maxVgroupsPerDb -v 1
 system sh/exec.sh -n dnode1 -s start
-sleep 3000
+sleep 1000
 sql connect
 
 $dbPrefix = lm1_db

tests/script/general/parser/limit1_stb.sim

-sleep 3000
+sleep 1000
 sql connect
 
 $dbPrefix = lm1_db

tests/script/general/parser/limit1_tb.sim

-sleep 3000
+sleep 1000
 sql connect
 
 $dbPrefix = lm1_db

tests/script/general/parser/limit1_tblocks100.sim

@@ -4,7 +4,7 @@ system sh/deploy.sh -n dnode1 -i 1
 system sh/cfg.sh -n dnode1 -c walLevel -v 0
 system sh/cfg.sh -n dnode1 -c maxVgroupsPerDb -v 1
 system sh/exec.sh -n dnode1 -s start
-sleep 3000
+sleep 1000
 sql connect
 
 $dbPrefix = lm1_db

tests/script/general/parser/limit2.sim

@@ -4,7 +4,7 @@ system sh/deploy.sh -n dnode1 -i 1
 system sh/cfg.sh -n dnode1 -c walLevel -v 0
 system sh/cfg.sh -n dnode1 -c rowsInFileBlock -v 255
 system sh/exec.sh -n dnode1 -s start
-sleep 3000
+sleep 1000
 sql connect
 
 $dbPrefix = lm2_db

tests/script/general/parser/limit2_query.sim

-sleep 3000
+sleep 1000
 sql connect
 
 $dbPrefix = lm2_db

tests/script/general/parser/limit2_tblocks100.sim

@@ -4,7 +4,7 @@ system sh/deploy.sh -n dnode1 -i 1
 system sh/cfg.sh -n dnode1 -c walLevel -v 0
 system sh/cfg.sh -n dnode1 -c rowsInFileBlock -v 255
 system sh/exec.sh -n dnode1 -s start
-sleep 3000
+sleep 1000
 sql connect
 
 $dbPrefix = lm2_db
@@ -69,7 +69,7 @@ print ====== tables created
 
 print ================== restart server to commit data into disk
 system sh/exec.sh -n dnode1 -s stop -x SIGINT
-sleep 3000
+sleep 1000
 system sh/exec.sh -n dnode1 -s start
 print ================== server restart completed
 

tests/script/general/parser/limit_stb.sim

-sleep 3000
+sleep 1000
 sql connect
 
 $dbPrefix = lm_db

tests/script/general/parser/limit_tb.sim

-sleep 3000
+sleep 1000
 sql connect
 
 $dbPrefix = lm_db

tests/script/general/parser/mixed_blocks.sim

@@ -5,7 +5,7 @@ system sh/cfg.sh -n dnode1 -c walLevel -v 0
 system sh/cfg.sh -n dnode1 -c maxtablespervnode -v 4
 system sh/exec.sh -n dnode1 -s start
 
-sleep 3000
+sleep 1000
 sql connect
 
 $dbPrefix = mb_db

tests/script/general/parser/nchar.sim

@@ -5,7 +5,7 @@ system sh/deploy.sh -n dnode1 -i 1
 system sh/cfg.sh -n dnode1 -c walLevel -v 0
 system sh/exec.sh -n dnode1 -s start
 
-sleep 3000
+sleep 1000
 sql connect
 
 print ======================== dnode1 start

tests/script/general/parser/null_char.sim

@@ -6,7 +6,7 @@ system sh/cfg.sh -n dnode1 -c walLevel -v 0
 system sh/cfg.sh -n dnode1 -c tableMetaKeepTimer -v 3
 system sh/exec.sh -n dnode1 -s start
 
-sleep 3000
+sleep 1000
 sql connect
 
 print ========== NULL_char.sim

tests/script/general/parser/projection_limit_offset.sim

@@ -4,7 +4,7 @@ system sh/deploy.sh -n dnode1 -i 1
 system sh/cfg.sh -n dnode1 -c walLevel -v 0
 system sh/cfg.sh -n dnode1 -c maxtablespervnode -v 4
 system sh/exec.sh -n dnode1 -s start
-sleep 3000
+sleep 1000
 sql connect
 
 $dbPrefix = group_db

tests/script/general/parser/selectResNum.sim

@@ -4,7 +4,7 @@ system sh/deploy.sh -n dnode1 -i 1
 system sh/cfg.sh -n dnode1 -c walLevel -v 0
 system sh/cfg.sh -n dnode1 -c maxtablespervnode -v 200
 system sh/exec.sh -n dnode1 -s start
-sleep 3000
+sleep 1000
 sql connect
 
 $dbPrefix = sc_db
@@ -122,9 +122,9 @@ system sh/exec.sh -n dnode1 -s stop -x SIGINT
 sleep 6000
 system sh/exec.sh -n dnode1 -s start
 print ====== server restart completed
-sleep 3000
+sleep 1000
 sql connect
-sleep 3000
+sleep 1000
 sql use $db
 
 ##### repeat test after server restart

tests/script/general/parser/select_across_vnodes.sim

@@ -4,7 +4,7 @@ system sh/deploy.sh -n dnode1 -i 1
 system sh/cfg.sh -n dnode1 -c walLevel -v 0
 system sh/cfg.sh -n dnode1 -c maxtablesPerVnode -v 5
 system sh/exec.sh -n dnode1 -s start
-sleep 3000
+sleep 1000
 sql connect
 
 $dbPrefix = sav_db

tests/script/general/parser/select_from_cache_disk.sim

@@ -4,7 +4,7 @@ system sh/deploy.sh -n dnode1 -i 1
 system sh/cfg.sh -n dnode1 -c walLevel -v 0
 system sh/cfg.sh -n dnode1 -c maxtablesPerVnode -v 2
 system sh/exec.sh -n dnode1 -s start
-sleep 3000
+sleep 1000
 sql connect
 
 $dbPrefix = scd_db
@@ -39,7 +39,7 @@ sleep 5000
 system sh/exec.sh -n dnode1 -s start
 print ================== server restart completed
 sql connect
-sleep 3000
+sleep 1000
 sql use $db
 
 # generate some data in cache

tests/script/general/parser/set_tag_vals.sim

@@ -4,7 +4,7 @@ system sh/deploy.sh -n dnode1 -i 1
 system sh/cfg.sh -n dnode1 -c walLevel -v 0
 system sh/cfg.sh -n dnode1 -c maxVgroupsPerDb -v 1
 system sh/exec.sh -n dnode1 -s start
-sleep 3000
+sleep 1000
 sql connect
 
 $dbPrefix = db

tests/script/general/parser/single_row_in_tb.sim

@@ -4,7 +4,7 @@ system sh/deploy.sh -n dnode1 -i 1
 system sh/cfg.sh -n dnode1 -c walLevel -v 0
 system sh/cfg.sh -n dnode1 -c maxtablespervnode -v 4
 system sh/exec.sh -n dnode1 -s start
-sleep 3000
+sleep 1000
 sql connect
 
 $dbPrefix = sr_db

tests/script/general/parser/single_row_in_tb_query.sim

-sleep 3000
+sleep 1000
 sql connect
 
 $dbPrefix = sr_db

tests/script/general/parser/slimit.sim

@@ -4,7 +4,7 @@ system sh/deploy.sh -n dnode1 -i 1
 system sh/cfg.sh -n dnode1 -c walLevel -v 0
 system sh/cfg.sh -n dnode1 -c maxtablesPerVnode -v 4
 system sh/exec.sh -n dnode1 -s start
-sleep 3000
+sleep 1000
 sql connect
 
 $dbPrefix = slm_db
@@ -101,7 +101,7 @@ sleep 5000
 system sh/exec.sh -n dnode1 -s start
 print ================== server restart completed
 sql connect
-sleep 3000
+sleep 1000
 
 run general/parser/slimit_query.sim
 

tests/script/general/parser/slimit1.sim

@@ -4,7 +4,7 @@ system sh/deploy.sh -n dnode1 -i 1
 system sh/cfg.sh -n dnode1 -c walLevel -v 0
 system sh/cfg.sh -n dnode1 -c maxtablesPerVnode -v 2
 system sh/exec.sh -n dnode1 -s start
-sleep 3000
+sleep 1000
 sql connect
 
 $dbPrefix = slm_alt_tg_db
@@ -60,7 +60,7 @@ sleep 5000
 system sh/exec.sh -n dnode1 -s start
 print ================== server restart completed
 sql connect
-sleep 3000
+sleep 1000
 
 run general/parser/slimit1_query.sim
 

tests/script/general/parser/slimit1_query.sim

-sleep 3000
+sleep 1000
 sql connect
 
 $dbPrefix = slm_alt_tg_db

tests/script/general/parser/slimit_alter_tags.sim

@@ -4,7 +4,7 @@ system sh/deploy.sh -n dnode1 -i 1
 system sh/cfg.sh -n dnode1 -c walLevel -v 0
 system sh/cfg.sh -n dnode1 -c maxtablesPerVnode -v 2
 system sh/exec.sh -n dnode1 -s start
-sleep 3000
+sleep 1000
 sql connect
 
 $dbPrefix = slm_alt_tg_db
@@ -175,7 +175,7 @@ sleep 5000
 system sh/exec.sh -n dnode1 -s start
 print ================== server restart completed
 sql connect
-sleep 3000
+sleep 1000
 
 sql use $db
 ### repeat above queries

tests/script/general/parser/slimit_query.sim

-sleep 3000
+sleep 1000
 sql connect
 
 $dbPrefix = slm_db

tests/script/general/parser/stream_on_sys.sim

@@ -6,7 +6,7 @@ system sh/cfg.sh -n dnode1 -c monitor       -v 1
 system sh/cfg.sh -n dnode1 -c monitorInterval     -v 1
 system sh/exec.sh -n dnode1 -s start
 
-sleep 3000
+sleep 1000
 sql connect
 print ======================== stream_on_sys.sim
 

tests/script/general/parser/tags_dynamically_specifiy.sim

@@ -3,9 +3,9 @@ system sh/stop_dnodes.sh
 system sh/deploy.sh -n dnode1 -i 1
 system sh/cfg.sh -n dnode1 -c walLevel -v 0
 system sh/exec.sh -n dnode1 -s start
-sleep 3000
+sleep 1000
 sql connect
-sleep 3000
+sleep 1000
 
 $db = dytag_db
 $tbNum = 10

tests/script/general/parser/tags_filter.sim

@@ -3,7 +3,7 @@ system sh/stop_dnodes.sh
 system sh/deploy.sh -n dnode1 -i 1
 system sh/cfg.sh -n dnode1 -c walLevel -v 0
 system sh/exec.sh -n dnode1 -s start
-sleep 3000
+sleep 1000
 sql connect
 
 $db = tf_db

tests/script/general/parser/tbnameIn.sim

@@ -3,7 +3,7 @@ system sh/stop_dnodes.sh
 system sh/deploy.sh -n dnode1 -i 1
 system sh/cfg.sh -n dnode1 -c walLevel -v 0
 system sh/exec.sh -n dnode1 -s start
-sleep 3000
+sleep 1000
 sql connect
 
 $dbPrefix = ti_db

tests/script/general/parser/tbnameIn_query.sim

-sleep 3000
+sleep 1000
 sql connect
 
 $dbPrefix = ti_db

tests/script/general/parser/testSuite.sim

-sleep 2000
+sleep 1000
 run general/parser/alter.sim
-sleep 2000
+sleep 1000
 run general/parser/alter1.sim
-sleep 2000
+sleep 1000
 run general/parser/alter_stable.sim
-sleep 2000
+sleep 1000
 run general/parser/auto_create_tb.sim
-sleep 2000
+sleep 1000
 run general/parser/auto_create_tb_drop_tb.sim
-sleep 2000
+sleep 1000
 run general/parser/col_arithmetic_operation.sim
-sleep 2000
+sleep 1000
 run general/parser/columnValue.sim
-sleep 2000
+sleep 1000
 run general/parser/commit.sim
-sleep 2000
+sleep 1000
 run general/parser/create_db.sim
-sleep 2000
+sleep 1000
 run general/parser/create_mt.sim
-sleep 2000
+sleep 1000
 run general/parser/create_tb.sim
-sleep 2000
+sleep 1000
 run general/parser/dbtbnameValidate.sim
-sleep 2000
+sleep 1000
 run general/parser/fill.sim
-sleep 2000
+sleep 1000
 run general/parser/fill_stb.sim
-sleep 2000
+sleep 1000
 #run general/parser/fill_us.sim               #
-sleep 2000
+sleep 1000
 run general/parser/first_last.sim
-sleep 2000
+sleep 1000
 run general/parser/import_commit1.sim
-sleep 2000
+sleep 1000
 run general/parser/import_commit2.sim
-sleep 2000
+sleep 1000
 run general/parser/import_commit3.sim
-sleep 2000
+sleep 1000
 #run general/parser/import_file.sim
-sleep 2000
+sleep 1000
 run general/parser/insert_tb.sim
-sleep 2000
+sleep 1000
 run general/parser/tags_dynamically_specifiy.sim
-sleep 2000
+sleep 1000
 run general/parser/interp.sim
-sleep 2000
+sleep 1000
 run general/parser/lastrow.sim
-sleep 2000
+sleep 1000
 run general/parser/limit.sim
-sleep 2000
+sleep 1000
 run general/parser/limit1.sim
-sleep 2000
+sleep 1000
 run general/parser/limit1_tblocks100.sim
-sleep 2000
+sleep 1000
 run general/parser/limit2.sim
-sleep 2000
+sleep 1000
 run general/parser/mixed_blocks.sim
-sleep 2000
+sleep 1000
 run general/parser/nchar.sim
-sleep 2000
+sleep 1000
 run general/parser/null_char.sim
-sleep 2000
+sleep 1000
 run general/parser/selectResNum.sim
-sleep 2000
+sleep 1000
 run general/parser/select_across_vnodes.sim
-sleep 2000
+sleep 1000
 run general/parser/select_from_cache_disk.sim
-sleep 2000
+sleep 1000
 run general/parser/set_tag_vals.sim
-sleep 2000
+sleep 1000
 run general/parser/single_row_in_tb.sim
-sleep 2000
+sleep 1000
 run general/parser/slimit.sim
-sleep 2000
+sleep 1000
 run general/parser/slimit1.sim
-sleep 2000
+sleep 1000
 run general/parser/slimit_alter_tags.sim
-sleep 2000
+sleep 1000
 run general/parser/tbnameIn.sim
-sleep 2000
+sleep 1000
 run general/parser/slimit_alter_tags.sim  # persistent failed
-sleep 2000
+sleep 1000
 run general/parser/join.sim
-sleep 2000
+sleep 1000
 run general/parser/join_multivnode.sim
-sleep 2000
+sleep 1000
 run general/parser/projection_limit_offset.sim
-sleep 2000
+sleep 1000
 run general/parser/select_with_tags.sim
-sleep 2000
+sleep 1000
 run general/parser/groupby.sim
-sleep 2000
+sleep 1000
 run general/parser/tags_filter.sim
-sleep 2000
+sleep 1000
 run general/parser/topbot.sim
-sleep 2000
+sleep 1000
 run general/parser/union.sim
-sleep 2000
+sleep 1000
 run general/parser/constCol.sim
-sleep 2000
+sleep 1000
 run general/parser/where.sim
-sleep 2000
+sleep 1000
 run general/parser/timestamp.sim
-sleep 2000
+sleep 1000
 run general/parser/sliding.sim
 
-#sleep 2000
+#sleep 1000
 #run general/parser/repeatStream.sim
-#sleep 2000
+#sleep 1000
 #run general/parser/stream_on_sys.sim
-#sleep 2000
+#sleep 1000
 #run general/parser/stream.sim
\ No newline at end of file

tests/script/general/parser/timestamp.sim

@@ -5,7 +5,7 @@ system sh/cfg.sh -n dnode1 -c walLevel -v 0
 system sh/cfg.sh -n dnode1 -c maxtablespervnode -v 4
 
 system sh/exec.sh -n dnode1 -s start
-sleep 3000
+sleep 1000
 sql connect
 
 $dbPrefix = ts_db
@@ -59,10 +59,10 @@ run general/parser/timestamp_query.sim
 
 print ================== restart server to commit data into disk
 system sh/exec.sh -n dnode1 -s stop -x SIGINT
-sleep 3000
+sleep 1000
 system sh/exec.sh -n dnode1 -s start
 print ================== server restart completed
 sql connect
-sleep 3000
+sleep 1000
 
 run general/parser/timestamp_query.sim

tests/script/general/parser/timestamp_query.sim

-sleep 3000
+sleep 1000
 sql connect
 
 $dbPrefix = ts_db

tests/script/general/parser/where.sim

@@ -5,7 +5,7 @@ system sh/cfg.sh -n dnode1 -c walLevel -v 0
 system sh/cfg.sh -n dnode1 -c maxtablespervnode -v 4
 system sh/exec.sh -n dnode1 -s start
 
-sleep 3000
+sleep 1000
 sql connect
 
 $dbPrefix = wh_db