suppport cmd show-create-table and show-create-db

src/client/inc/tsclient.h

@@ -98,6 +98,7 @@ typedef struct STableMeta {
   uint8_t        tableType;
   int16_t        sversion;
   int16_t        tversion;
+  char           sTableId[TSDB_TABLE_FNAME_LEN];
   SCMVgroupInfo  vgroupInfo;
   SCMCorVgroupInfo  corVgroupInfo;
   STableId       id;

src/client/src/tscLocal.c

@@ -24,7 +24,30 @@
 #include "tscUtil.h"
 #include "tschemautil.h"
 #include "tsclient.h"
-
+#include "taos.h"
+#include "tscSubquery.h"
+
+#define STR_NOCASE_EQUAL(str1, len1, str2, len2) ((len1 == len2) && 0 == strncasecmp(str1, str2, len1)) 
+
+typedef enum BuildType {
+  SCREATE_BUILD_TABLE = 1, 
+  SCREATE_BUILD_DB    = 2, 
+} BuildType; 
+
+typedef enum Stage {
+  SCREATE_CALLBACK_QUERY    = 1,
+  SCREATE_CALLBACK_RETRIEVE = 2,
+} Stage;
+
+// support 'show create table'   
+typedef struct SCreateBuilder {
+  char sTableName[TSDB_TABLE_FNAME_LEN];
+  char buf[TSDB_TABLE_FNAME_LEN];
+  SSqlObj *pParentSql; 
+  SSqlObj *pInterSql;
+  int32_t (*fp)(void *para, char* result);
+  Stage callStage;
+} SCreateBuilder; 
 static void tscSetLocalQueryResult(SSqlObj *pSql, const char *val, const char *columnName, int16_t type, size_t valueLength);
 
 static int32_t getToStringLength(const char *pData, int32_t length, int32_t type) {
@@ -273,7 +296,505 @@ static int32_t tscProcessDescribeTable(SSqlObj *pSql) {
   tscFieldInfoUpdateOffset(pQueryInfo);
   return tscSetValueToResObj(pSql, rowLen);
 }
+static int32_t tscGetNthFieldResult(TAOS_ROW row, TAOS_FIELD* fields, int *lengths, int idx, char *result) {
+  const char *val = row[idx];
+  if (val == NULL) {
+    sprintf(result, "%s", TSDB_DATA_NULL_STR);
+    return -1;
+  } 
+  uint8_t type = fields[idx].type;
+  int32_t length = lengths[idx]; 
+
+  switch (type) {
+    case TSDB_DATA_TYPE_BOOL: 
+      sprintf(result, "%s", ((((int)(*((char *)val))) == 1) ? "true" : "false"));
+      break;
+    case TSDB_DATA_TYPE_TINYINT:
+      sprintf(result, "%d", (int)(*((char *)val)));
+      break;
+    case TSDB_DATA_TYPE_SMALLINT: 
+      sprintf(result, "%d", (int)(*((short *)val)));
+      break;
+    case TSDB_DATA_TYPE_INT:
+      sprintf(result, "%d", *((int *)val));
+      break;
+    case TSDB_DATA_TYPE_BIGINT: 
+      sprintf(result, "%"PRId64, *((int64_t *)val)); 
+      break;
+    case TSDB_DATA_TYPE_FLOAT:
+      sprintf(result, "%f", GET_FLOAT_VAL(val)); 
+      break;
+    case TSDB_DATA_TYPE_DOUBLE:
+      sprintf(result, "%f", GET_DOUBLE_VAL(val)); 
+      break;
+    case TSDB_DATA_TYPE_NCHAR:
+    case TSDB_DATA_TYPE_BINARY:
+      memcpy(result, val, length); 
+      break;
+    case TSDB_DATA_TYPE_TIMESTAMP:
+      ///formatTimestamp(buf, *(int64_t*)val, TSDB_TIME_PRECISION_MICRO);
+      //memcpy(result, val, strlen(buf));
+      sprintf(result, "%"PRId64, *((int64_t *)val)); 
+      break;
+    default:
+      break; 
+  }
+  return 0;
+} 
+
+void tscSCreateCallBack(void *param, TAOS_RES *tres, int code) {
+  if (param == NULL || tres == NULL) {
+    return;
+  }  
+  SCreateBuilder *builder = (SCreateBuilder *)(param);
+  SSqlObj *pParentSql = builder->pParentSql;  
+  SSqlObj *pSql = (SSqlObj *)tres; 
+
+  SSqlRes *pRes = &pParentSql->res;
+  pRes->code = taos_errno(pSql); 
+  if (pRes->code != TSDB_CODE_SUCCESS) {
+    taos_free_result(pSql);  
+    free(builder);
+    tscQueueAsyncRes(pParentSql);
+    return;
+  }
+
+  if (builder->callStage == SCREATE_CALLBACK_QUERY) {
+    taos_fetch_rows_a(tres, tscSCreateCallBack, param);    
+    builder->callStage = SCREATE_CALLBACK_RETRIEVE;
+  } else {
+    char *result = calloc(1, TSDB_MAX_BINARY_LEN);
+    pRes->code = builder->fp(builder, result);
+
+    taos_free_result(pSql);  
+    free(builder);
+    free(result);
+
+    if (pRes->code == TSDB_CODE_SUCCESS) {
+      (*pParentSql->fp)(pParentSql->param, pParentSql, code);  
+    } else {
+      tscQueueAsyncRes(pParentSql);
+    }
+  }
+}
+
+TAOS_ROW tscFetchRow(void *param) {
+  SCreateBuilder *builder = (SCreateBuilder *)param;
+  if (builder == NULL) {
+    return NULL;
+  } 
+  SSqlObj *pSql = builder->pInterSql;
+  if (pSql == NULL || pSql->signature != pSql) {
+    terrno = TSDB_CODE_TSC_DISCONNECTED;
+    return NULL;
+  }
+  
+  SSqlCmd *pCmd = &pSql->cmd;
+  SSqlRes *pRes = &pSql->res;
+  
+  if (pRes->qhandle == 0 ||
+      pCmd->command == TSDB_SQL_RETRIEVE_EMPTY_RESULT ||
+      pCmd->command == TSDB_SQL_INSERT) {
+    return NULL;
+  }
+
+  // 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 )) {
+    taos_fetch_rows_a(pSql, tscSCreateCallBack, param);
+    return NULL;
+  }
 
+  void* data = doSetResultRowData(pSql, true);
+
+  tscClearSqlOwner(pSql);
+  return data;
+}
+static int32_t tscGetTableTagValue(SCreateBuilder *builder, char *result) {
+  TAOS_ROW row = tscFetchRow(builder);
+  SSqlObj* pSql = builder->pInterSql;
+
+  if (row == NULL) {
+   return TSDB_CODE_MND_INVALID_TABLE_NAME;
+  }
+
+  int32_t* lengths = taos_fetch_lengths(pSql);  
+  int num_fields = taos_num_fields(pSql);
+  TAOS_FIELD *fields = taos_fetch_fields(pSql);
+
+  char buf[TSDB_COL_NAME_LEN + 16]; 
+  for (int i = 0; i < num_fields; i++) {
+    memset(buf, 0, sizeof(buf));
+    int32_t ret = tscGetNthFieldResult(row, fields, lengths, i, buf);
+
+    if (i == 0) {
+      snprintf(result + strlen(result), TSDB_MAX_BINARY_LEN - strlen(result), "%s", "(");
+    } 
+    if ((fields[i].type == TSDB_DATA_TYPE_NCHAR 
+        || fields[i].type == TSDB_DATA_TYPE_BINARY 
+        || fields[i].type == TSDB_DATA_TYPE_TIMESTAMP) && 0 == ret) {
+      snprintf(result + strlen(result), TSDB_MAX_BINARY_LEN - strlen(result), "\"%s\",", buf);
+    } else {
+      snprintf(result + strlen(result), TSDB_MAX_BINARY_LEN - strlen(result), "%s,", buf);
+    }
+    if (i == num_fields - 1) {
+      sprintf(result + strlen(result) - 1, "%s", ")");
+    }
+  }  
+
+  if (0 == strlen(result)) {
+   return TSDB_CODE_MND_INVALID_TABLE_NAME; 
+  }
+  return TSDB_CODE_SUCCESS;
+}
+
+
+// build 'show create table/database' result fields 
+static int32_t tscSCreateBuildResultFields(SSqlObj *pSql, BuildType type, const char *ddl) {
+  int32_t  rowLen = 0;
+  int16_t  ddlLen = strlen(ddl); 
+  SColumnIndex index = {0};
+  pSql->cmd.numOfCols = 2;
+
+  SQueryInfo* pQueryInfo = tscGetQueryInfoDetail(&pSql->cmd, 0);
+  pQueryInfo->order.order = TSDB_ORDER_ASC;
+
+  TAOS_FIELD f; 
+  if (type == SCREATE_BUILD_TABLE) {
+    f.type  = TSDB_DATA_TYPE_BINARY;
+    f.bytes = (TSDB_COL_NAME_LEN - 1) + VARSTR_HEADER_SIZE;
+    tstrncpy(f.name, "Table", sizeof(f.name));
+  } else {
+    f.type  = TSDB_DATA_TYPE_BINARY;
+    f.bytes =  (TSDB_DB_NAME_LEN - 1) + VARSTR_HEADER_SIZE;
+    tstrncpy(f.name, "Database", sizeof(f.name));
+  } 
+
+  SFieldSupInfo* pInfo = tscFieldInfoAppend(&pQueryInfo->fieldsInfo, &f);
+  pInfo->pSqlExpr = tscSqlExprAppend(pQueryInfo, TSDB_FUNC_TS_DUMMY, &index, TSDB_DATA_TYPE_BINARY,
+      f.bytes, f.bytes - VARSTR_HEADER_SIZE, false);
+
+  rowLen += f.bytes; 
+
+  f.bytes = (int16_t)(ddlLen + VARSTR_HEADER_SIZE);
+  f.type = TSDB_DATA_TYPE_BINARY;
+  if (type == SCREATE_BUILD_TABLE) {
+    tstrncpy(f.name, "Create Table", sizeof(f.name));
+  } else {
+    tstrncpy(f.name, "Create Database", sizeof(f.name));
+  }
+
+  pInfo = tscFieldInfoAppend(&pQueryInfo->fieldsInfo, &f);
+  pInfo->pSqlExpr = tscSqlExprAppend(pQueryInfo, TSDB_FUNC_TS_DUMMY, &index, TSDB_DATA_TYPE_BINARY, 
+      (int16_t)(ddlLen + VARSTR_HEADER_SIZE), ddlLen, false);
+
+  rowLen += ddlLen + VARSTR_HEADER_SIZE;
+
+  return rowLen;
+}
+static int32_t tscSCreateSetValueToResObj(SSqlObj *pSql, int32_t rowLen, const char *tableName, const char *ddl) {
+  SSqlRes *pRes = &pSql->res;
+
+  SQueryInfo* pQueryInfo = tscGetQueryInfoDetail(&pSql->cmd, 0);
+  int32_t numOfRows = 1;
+  if (strlen(ddl) == 0) {
+    
+  }
+  tscInitResObjForLocalQuery(pSql, numOfRows, rowLen);
+
+  TAOS_FIELD *pField = tscFieldInfoGetField(&pQueryInfo->fieldsInfo, 0);
+  char* dst = pRes->data + tscFieldInfoGetOffset(pQueryInfo, 0) * numOfRows;
+  STR_WITH_MAXSIZE_TO_VARSTR(dst, tableName, pField->bytes);
+
+  pField = tscFieldInfoGetField(&pQueryInfo->fieldsInfo, 1);
+  dst = pRes->data + tscFieldInfoGetOffset(pQueryInfo, 1) * numOfRows;
+  STR_WITH_MAXSIZE_TO_VARSTR(dst, ddl, pField->bytes);
+  return 0;
+}
+static int32_t tscSCreateBuildResult(SSqlObj *pSql, BuildType type, const char *str, const char *result) {
+  SQueryInfo* pQueryInfo = tscGetQueryInfoDetail(&pSql->cmd, 0); 
+  int32_t rowLen = tscSCreateBuildResultFields(pSql, type, result);
+
+  tscFieldInfoUpdateOffset(pQueryInfo);
+  return tscSCreateSetValueToResObj(pSql, rowLen, str, result);  
+}
+int32_t tscRebuildCreateTableStatement(void *param,char *result) {
+  SCreateBuilder *builder = (SCreateBuilder *)param;
+  int32_t code = TSDB_CODE_SUCCESS;
+
+  char *buf = calloc(1,TSDB_MAX_BINARY_LEN);
+  if (buf == NULL) {
+    return TSDB_CODE_TSC_OUT_OF_MEMORY;
+  }
+
+  code = tscGetTableTagValue(builder, buf);
+  if (code == TSDB_CODE_SUCCESS) {
+    snprintf(result + strlen(result), TSDB_MAX_BINARY_LEN - strlen(result), "CREATE TABLE %s USING %s TAGS %s", builder->buf, builder->sTableName, buf);
+    code = tscSCreateBuildResult(builder->pParentSql, SCREATE_BUILD_TABLE, builder->buf, result);    
+  }  
+  free(buf);
+  return code;
+}
+
+static int32_t tscGetDBInfo(SCreateBuilder *builder, char *result) {
+  TAOS_ROW row = tscFetchRow(builder);
+  if (row == NULL) {
+   return TSDB_CODE_MND_DB_NOT_SELECTED; 
+  }
+  const char *showColumns[] = {"REPLICA", "QUORUM", "DAYS", "KEEP", "BLOCKS", NULL};
+
+  SSqlObj *pSql = builder->pInterSql;
+  TAOS_FIELD *fields = taos_fetch_fields(pSql);
+  int num_fields = taos_num_fields(pSql);
+
+  char buf[TSDB_DB_NAME_LEN + 64] = {0}; 
+  do {
+    int32_t* lengths = taos_fetch_lengths(pSql);  
+    int32_t ret = tscGetNthFieldResult(row, fields, lengths, 0, buf);
+    if (0 == ret && STR_NOCASE_EQUAL(buf, strlen(buf), builder->buf, strlen(builder->buf))) {
+      snprintf(result + strlen(result), TSDB_MAX_BINARY_LEN - strlen(result), "CREATE DATABASE %s", buf);  
+      for (int i = 1; i < num_fields; i++) {
+        for (int j = 0; showColumns[j] != NULL; j++) {
+          if (STR_NOCASE_EQUAL(fields[i].name, strlen(fields[i].name), showColumns[j], strlen(showColumns[j]))) {
+            memset(buf, 0, sizeof(buf));
+            ret = tscGetNthFieldResult(row, fields, lengths, i, buf);
+            if (ret == 0) {
+              snprintf(result + strlen(result), TSDB_MAX_BINARY_LEN - strlen(result), " %s %s", showColumns[j], buf); 
+            }
+          }
+        }
+      }
+      break;
+    } 
+    
+    row = tscFetchRow(builder);
+  } while (row != NULL);
+
+  if (0 == strlen(result)) {
+   return TSDB_CODE_MND_DB_NOT_SELECTED; 
+  }
+
+  return TSDB_CODE_SUCCESS;
+}
+int32_t tscRebuildCreateDBStatement(void *param,char *result) {
+  SCreateBuilder *builder = (SCreateBuilder *)param;
+  int32_t code = TSDB_CODE_SUCCESS;
+
+  char *buf = calloc(1, TSDB_MAX_BINARY_LEN);
+  if (buf == NULL) {
+    return TSDB_CODE_TSC_OUT_OF_MEMORY;
+  }
+  code = tscGetDBInfo(param, buf);  
+  if (code == TSDB_CODE_SUCCESS) {
+    code = tscSCreateBuildResult(builder->pParentSql, SCREATE_BUILD_DB, builder->buf, buf);    
+  }
+  free(buf);
+  return code;
+}
+
+static int32_t tscGetTableTagColumnName(SSqlObj *pSql, char **result) {
+  char *buf = (char *)malloc(TSDB_MAX_BINARY_LEN);
+  if (buf == NULL) {
+    return TSDB_CODE_TSC_OUT_OF_MEMORY; 
+  }
+  buf[0] = 0;
+
+  STableMeta *pMeta = tscGetTableMetaInfoFromCmd(&pSql->cmd, 0, 0)->pTableMeta; 
+  if (pMeta->tableType == TSDB_SUPER_TABLE || pMeta->tableType == TSDB_NORMAL_TABLE ||
+      pMeta->tableType == TSDB_STREAM_TABLE) {
+    free(buf);
+    return TSDB_CODE_TSC_INVALID_VALUE;
+  } 
+
+  SSchema *pTagsSchema = tscGetTableTagSchema(pMeta);  
+  int32_t numOfTags = tscGetNumOfTags(pMeta);
+  for (int32_t i = 0; i < numOfTags; i++) {
+    if (i != numOfTags - 1) {
+      snprintf(buf + strlen(buf), TSDB_MAX_BINARY_LEN - strlen(buf), "%s,", pTagsSchema[i].name);  
+    } else {
+      snprintf(buf + strlen(buf), TSDB_MAX_BINARY_LEN - strlen(buf), "%s", pTagsSchema[i].name);
+    }
+  }   
+
+  *result = buf;
+  return TSDB_CODE_SUCCESS;
+}  
+static int32_t tscRebuildDDLForSubTable(SSqlObj *pSql, const char *tableName, char *ddl) {
+  SQueryInfo* pQueryInfo = tscGetQueryInfoDetail(&pSql->cmd, 0);
+
+  STableMetaInfo *pTableMetaInfo = tscGetMetaInfo(pQueryInfo, 0);
+  STableMeta *    pMeta = pTableMetaInfo->pTableMeta;
+
+  SSqlObj *pInterSql = (SSqlObj *)calloc(1, sizeof(SSqlObj)); 
+  if (pInterSql == NULL) {
+    return TSDB_CODE_TSC_OUT_OF_MEMORY;
+  }  
+
+  SCreateBuilder *param = (SCreateBuilder *)malloc(sizeof(SCreateBuilder));    
+  if (param == NULL) {
+    free(pInterSql);
+    return TSDB_CODE_TSC_OUT_OF_MEMORY;
+  }
+
+  char fullName[TSDB_TABLE_FNAME_LEN] = {0};
+  extractDBName(pTableMetaInfo->name, fullName);
+  extractTableName(pMeta->sTableId, param->sTableName);
+  snprintf(fullName + strlen(fullName), TSDB_TABLE_FNAME_LEN - strlen(fullName),  ".%s", param->sTableName);
+  extractTableName(pTableMetaInfo->name, param->buf);
+
+  //tstrncpy(param->tableName, pTableMetaInfo->name, TSDB_TABLE_FNAME_LEN);
+  param->pParentSql = pSql;
+  param->pInterSql  = pInterSql;
+  param->fp         = tscRebuildCreateTableStatement;
+  param->callStage  = SCREATE_CALLBACK_QUERY;
+
+  char *query = (char *)calloc(1, TSDB_MAX_BINARY_LEN); 
+  if (query == NULL) {
+    free(param);
+    free(pInterSql);
+    return TSDB_CODE_TSC_OUT_OF_MEMORY;
+  }
+
+  char *columns = NULL;
+  int32_t code = tscGetTableTagColumnName(pSql, &columns) ;
+  if (code != TSDB_CODE_SUCCESS) {
+    free(param); 
+    free(pInterSql);
+    return code;
+  }
+
+  snprintf(query + strlen(query), TSDB_MAX_BINARY_LEN - strlen(query), "SELECT %s FROM %s WHERE TBNAME IN(\'%s\')", columns, fullName, param->buf);
+  doAsyncQuery(pSql->pTscObj, pInterSql, tscSCreateCallBack, param, query, strlen(query));
+  free(query);
+  free(columns);
+
+  return TSDB_CODE_TSC_ACTION_IN_PROGRESS; 
+}
+static int32_t tscRebuildDDLForNormalTable(SSqlObj *pSql, const char *tableName, char *ddl) {
+  SQueryInfo* pQueryInfo = tscGetQueryInfoDetail(&pSql->cmd, 0);
+  STableMetaInfo *pTableMetaInfo = tscGetMetaInfo(pQueryInfo, 0);
+  STableMeta *    pMeta = pTableMetaInfo->pTableMeta;
+
+  int32_t numOfRows = tscGetNumOfColumns(pMeta);
+  SSchema *pSchema = tscGetTableSchema(pMeta);
+
+  char *result = ddl;
+  sprintf(result, "create table %s (", tableName);
+  for (int32_t i = 0; i < numOfRows; ++i) {
+    uint8_t type = pSchema[i].type;
+    if (type == TSDB_DATA_TYPE_BINARY || type == TSDB_DATA_TYPE_NCHAR) {
+      sprintf(result + strlen(result), "%s %s(%d),", pSchema[i].name,tDataTypeDesc[pSchema[i].type].aName,pSchema->bytes);
+    } else {
+      sprintf(result + strlen(result), "%s %s,", pSchema[i].name, tDataTypeDesc[pSchema[i].type].aName); 
+    }
+  }
+  sprintf(result + strlen(result) - 1, "%s", ")");
+
+  return TSDB_CODE_SUCCESS;
+}
+static int32_t tscRebuildDDLForSuperTable(SSqlObj *pSql, const char *tableName, char *ddl) {
+  char *result = ddl;
+  SQueryInfo* pQueryInfo = tscGetQueryInfoDetail(&pSql->cmd, 0);
+  STableMetaInfo *pTableMetaInfo = tscGetMetaInfo(pQueryInfo, 0);
+  STableMeta *    pMeta = pTableMetaInfo->pTableMeta;
+
+  int32_t numOfRows = tscGetNumOfColumns(pMeta);
+  int32_t totalRows = numOfRows + tscGetNumOfTags(pMeta);
+  SSchema *pSchema = tscGetTableSchema(pMeta);
+
+  sprintf(result, "create table %s (", tableName);
+  for (int32_t i = 0; i < numOfRows; ++i) {
+    uint8_t type = pSchema[i].type;
+    if (type == TSDB_DATA_TYPE_BINARY || type == TSDB_DATA_TYPE_NCHAR) {
+      sprintf(result + strlen(result), "%s %s(%d),", pSchema[i].name,tDataTypeDesc[pSchema[i].type].aName,pSchema->bytes);
+    } else {
+      sprintf(result + strlen(result), "%s %s,", pSchema[i].name, tDataTypeDesc[type].aName); 
+    }
+  }
+  sprintf(result + strlen(result) - 1, "%s ", ")");
+
+  sprintf(result + strlen(result), "TAGS (");
+  for (int32_t i = numOfRows; i < totalRows; i++) {
+    uint8_t type = pSchema[i].type;
+    if (type == TSDB_DATA_TYPE_BINARY || type == TSDB_DATA_TYPE_NCHAR) {
+      sprintf(result + strlen(result), "%s %s(%d),", pSchema[i].name,tDataTypeDesc[pSchema[i].type].aName,pSchema->bytes);
+    } else {
+      sprintf(result + strlen(result), "%s %s,", pSchema[i].name, tDataTypeDesc[type].aName); 
+    }
+
+  }
+  sprintf(result + strlen(result) - 1, "%s", ")");
+
+  return TSDB_CODE_SUCCESS;
+}
+
+static int32_t tscProcessShowCreateTable(SSqlObj *pSql) {
+  SQueryInfo* pQueryInfo = tscGetQueryInfoDetail(&pSql->cmd, 0);
+  STableMetaInfo *pTableMetaInfo = tscGetMetaInfo(pQueryInfo, 0);
+  assert(pTableMetaInfo->pTableMeta != NULL);
+
+  char tableName[TSDB_TABLE_NAME_LEN] = {0};
+  extractTableName(pTableMetaInfo->name, tableName);
+
+  char result[TSDB_MAX_BYTES_PER_ROW] = {0};
+  int32_t code = TSDB_CODE_SUCCESS;
+  if (UTIL_TABLE_IS_SUPER_TABLE(pTableMetaInfo)) {
+    code = tscRebuildDDLForSuperTable(pSql, tableName, result);
+  } else if (UTIL_TABLE_IS_NORMAL_TABLE(pTableMetaInfo)) {
+    code = tscRebuildDDLForNormalTable(pSql, tableName, result);
+  } else if (UTIL_TABLE_IS_CHILD_TABLE(pTableMetaInfo)) {
+    code = tscRebuildDDLForSubTable(pSql, tableName, result);
+  } else {
+    code = TSDB_CODE_TSC_INVALID_VALUE;
+  }
+
+  if (code != TSDB_CODE_SUCCESS) {
+    return code;
+  }
+  return tscSCreateBuildResult(pSql, SCREATE_BUILD_TABLE, tableName, result);
+}
+
+static int32_t tscProcessShowCreateDatabase(SSqlObj *pSql) {
+  SQueryInfo* pQueryInfo = tscGetQueryInfoDetail(&pSql->cmd, 0);
+
+  STableMetaInfo *pTableMetaInfo = tscGetMetaInfo(pQueryInfo, 0);
+
+  SSqlObj *pInterSql = (SSqlObj *)calloc(1, sizeof(SSqlObj)); 
+  if (pInterSql == NULL) {
+    return TSDB_CODE_TSC_OUT_OF_MEMORY;
+  }  
+
+  SCreateBuilder *param = (SCreateBuilder *)malloc(sizeof(SCreateBuilder));    
+  if (param == NULL) {
+    free(pInterSql);
+    return TSDB_CODE_TSC_OUT_OF_MEMORY;
+  }
+  extractTableName(pTableMetaInfo->name, param->buf);
+  param->pParentSql = pSql;
+  param->pInterSql  = pInterSql;
+  param->fp         = tscRebuildCreateDBStatement;
+  param->callStage  = SCREATE_CALLBACK_QUERY;
+   
+  const char *query = "show databases";
+  doAsyncQuery(pSql->pTscObj, pInterSql, tscSCreateCallBack, param, query, strlen(query));
+  return TSDB_CODE_TSC_ACTION_IN_PROGRESS;
+}
 static int32_t tscProcessCurrentUser(SSqlObj *pSql) {
   SQueryInfo* pQueryInfo = tscGetQueryInfoDetail(&pSql->cmd, 0);
 
@@ -337,6 +858,7 @@ static int32_t tscProcessServerVer(SSqlObj *pSql) {
   char* vx = calloc(1, pExpr->resBytes);
   if (vx == NULL) {
     return TSDB_CODE_TSC_OUT_OF_MEMORY;
+
   }
 
   STR_WITH_SIZE_TO_VARSTR(vx, v, (VarDataLenT)t);
@@ -344,6 +866,7 @@ static int32_t tscProcessServerVer(SSqlObj *pSql) {
 
   free(vx);
   return TSDB_CODE_SUCCESS;
+
 }
 
 static int32_t tscProcessClientVer(SSqlObj *pSql) {
@@ -358,6 +881,7 @@ static int32_t tscProcessClientVer(SSqlObj *pSql) {
   char* v = calloc(1, pExpr->resBytes);
   if (v == NULL) {
     return TSDB_CODE_TSC_OUT_OF_MEMORY;
+
   }
 
   STR_WITH_SIZE_TO_VARSTR(v, version, (VarDataLenT)t);
@@ -365,6 +889,7 @@ static int32_t tscProcessClientVer(SSqlObj *pSql) {
 
   free(v);
   return TSDB_CODE_SUCCESS;
+
 }
 
 static int32_t tscProcessServStatus(SSqlObj *pSql) {
@@ -429,6 +954,10 @@ int tscProcessLocalCmd(SSqlObj *pSql) {
      */
     pRes->qhandle = 0x1;
     pRes->numOfRows = 0;
+  } else if (pCmd->command == TSDB_SQL_SHOW_CREATE_TABLE) {
+    pRes->code = tscProcessShowCreateTable(pSql); 
+  } else if (pCmd->command == TSDB_SQL_SHOW_CREATE_DATABASE) {
+    pRes->code = tscProcessShowCreateDatabase(pSql); 
   } else if (pCmd->command == TSDB_SQL_RESET_CACHE) {
     taosCacheEmpty(tscCacheHandle);
     pRes->code = TSDB_CODE_SUCCESS;
@@ -448,12 +977,13 @@ int tscProcessLocalCmd(SSqlObj *pSql) {
   }
 
   // keep the code in local variable in order to avoid invalid read in case of async query
+
   int32_t code = pRes->code;
   if (code == TSDB_CODE_SUCCESS) {
     (*pSql->fp)(pSql->param, pSql, code);
+  } else if (code == TSDB_CODE_TSC_ACTION_IN_PROGRESS){
   } else {
     tscQueueAsyncRes(pSql);
   }
-
   return code;
 }

src/client/src/tscSQLParser.c

@@ -366,7 +366,40 @@ int32_t tscToSQLCmd(SSqlObj* pSql, struct SSqlInfo* pInfo) {
 
       return tscGetTableMeta(pSql, pTableMetaInfo);
     }
+    case TSDB_SQL_SHOW_CREATE_TABLE: {
+      SStrToken*  pToken = &pInfo->pDCLInfo->a[0];
+      const char* msg1 = "invalid table name";
+      const char* msg2 = "table name is too long";
+
+      if (tscValidateName(pToken) != TSDB_CODE_SUCCESS) {
+        return invalidSqlErrMsg(tscGetErrorMsgPayload(pCmd), msg1);
+      }
 
+      if (!tscValidateTableNameLength(pToken->n)) {
+        return invalidSqlErrMsg(tscGetErrorMsgPayload(pCmd), msg2);
+      }
+
+      if (tscSetTableFullName(pTableMetaInfo, pToken, pSql) != TSDB_CODE_SUCCESS) {
+        return invalidSqlErrMsg(tscGetErrorMsgPayload(pCmd), msg2);
+      }
+      return tscGetTableMeta(pSql, pTableMetaInfo);
+    }
+    case TSDB_SQL_SHOW_CREATE_DATABASE: {
+      const char* msg1 = "invalid database name";
+      const char* msg2 = "table name is too long";
+      SStrToken*  pToken = &pInfo->pDCLInfo->a[0];
+
+      if (tscValidateName(pToken) != TSDB_CODE_SUCCESS) {
+        return invalidSqlErrMsg(tscGetErrorMsgPayload(pCmd), msg1);
+      }
+      if (pToken->n > TSDB_DB_NAME_LEN) {
+        return invalidSqlErrMsg(tscGetErrorMsgPayload(pCmd), msg1);
+      }
+      if (tscSetTableFullName(pTableMetaInfo, pToken, pSql) != TSDB_CODE_SUCCESS) {
+        return invalidSqlErrMsg(tscGetErrorMsgPayload(pCmd), msg2);
+      }
+      return TSDB_CODE_SUCCESS; 
+    }                                
     case TSDB_SQL_CFG_DNODE: {
       const char* msg2 = "invalid configure options or values, such as resetlog / debugFlag 135 / balance 'vnode:2-dnode:2' / monitor 1 ";
       const char* msg3 = "invalid dnode ep";

src/client/src/tscSchemaUtil.c

@@ -170,6 +170,7 @@ STableMeta* tscCreateTableMetaFromMsg(STableMetaMsg* pTableMetaMsg, size_t* size
 
   pTableMeta->sversion = pTableMetaMsg->sversion;
   pTableMeta->tversion = pTableMetaMsg->tversion;
+  tstrncpy(pTableMeta->sTableId, pTableMetaMsg->sTableId, TSDB_TABLE_FNAME_LEN);
   
   memcpy(pTableMeta->schema, pTableMetaMsg->schema, schemaSize);
   

src/client/src/tscServer.c

@@ -2072,6 +2072,9 @@ int tscProcessAlterDbMsgRsp(SSqlObj *pSql) {
   UNUSED(pSql);
   return 0;
 }
+int tscProcessShowCreateRsp(SSqlObj *pSql) {
+  return tscLocalResultCommonBuilder(pSql, 1);
+}
 
 int tscProcessQueryRsp(SSqlObj *pSql) {
   SSqlRes *pRes = &pSql->res;
@@ -2343,6 +2346,10 @@ void tscInitMsgsFp() {
   tscProcessMsgRsp[TSDB_SQL_ALTER_TABLE] = tscProcessAlterTableMsgRsp;
   tscProcessMsgRsp[TSDB_SQL_ALTER_DB] = tscProcessAlterDbMsgRsp;
 
+  tscProcessMsgRsp[TSDB_SQL_SHOW_CREATE_TABLE] = tscProcessShowCreateRsp;
+  tscProcessMsgRsp[TSDB_SQL_SHOW_CREATE_DATABASE] = tscProcessShowCreateRsp;
+  
+
   tscKeepConn[TSDB_SQL_SHOW] = 1;
   tscKeepConn[TSDB_SQL_RETRIEVE] = 1;
   tscKeepConn[TSDB_SQL_SELECT] = 1;

src/client/src/tscSql.c

@@ -451,6 +451,8 @@ TAOS_ROW taos_fetch_row(TAOS_RES *res) {
        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 ||

src/client/src/tscSubquery.c

@@ -23,6 +23,7 @@
 #include "tscSubquery.h"
 #include "tschemautil.h"
 #include "tsclient.h"
+#include "tscSubquery.h"
 
 typedef struct SInsertSupporter {
   SSubqueryState* pState;

src/common/inc/tcmdtype.h

@@ -78,6 +78,9 @@ enum {
   TSDB_DEFINE_SQL_TYPE( TSDB_SQL_RETRIEVE_LOCALMERGE, "retrieve-localmerge" )
   TSDB_DEFINE_SQL_TYPE( TSDB_SQL_TABLE_JOIN_RETRIEVE, "join-retrieve" )
 
+  TSDB_DEFINE_SQL_TYPE( TSDB_SQL_SHOW_CREATE_TABLE, "show-create-table")
+  TSDB_DEFINE_SQL_TYPE( TSDB_SQL_SHOW_CREATE_DATABASE, "show-create-database")
+
   /*
    * build empty result instead of accessing dnode to fetch result
    * reset the client cache

src/inc/taosmsg.h

@@ -677,6 +677,7 @@ typedef struct {
 typedef struct STableMetaMsg {
   int32_t       contLen;
   char          tableId[TSDB_TABLE_FNAME_LEN];   // table id
+  char          sTableId[TSDB_TABLE_FNAME_LEN];
   uint8_t       numOfTags;
   uint8_t       precision;
   uint8_t       tableType;

src/inc/ttokendef.h

@@ -75,24 +75,24 @@
 #define TK_VNODES                         57
 #define TK_IPTOKEN                        58
 #define TK_DOT                            59
-#define TK_TABLES                          60
-#define TK_STABLES                         61
-#define TK_VGROUPS                         62
-#define TK_DROP                            63
-#define TK_TABLE                           64
-#define TK_DATABASE                        65
-#define TK_DNODE                           66
-#define TK_USER                            67
-#define TK_ACCOUNT                         68
-#define TK_USE                             69
-#define TK_DESCRIBE                        70
-#define TK_ALTER                           71
-#define TK_PASS                            72
-#define TK_PRIVILEGE                       73
-#define TK_LOCAL                           74
-#define TK_IF                              75
-#define TK_EXISTS                          76
-#define TK_CREATE                          77
+#define TK_CREATE                         60
+#define TK_TABLE                          61
+#define TK_DATABASE                       62
+#define TK_TABLES                         63
+#define TK_STABLES                        64
+#define TK_VGROUPS                        65
+#define TK_DROP                           66
+#define TK_DNODE                          67
+#define TK_USER                           68
+#define TK_ACCOUNT                        69
+#define TK_USE                            70
+#define TK_DESCRIBE                       71
+#define TK_ALTER                          72
+#define TK_PASS                           73
+#define TK_PRIVILEGE                      74
+#define TK_LOCAL                          75
+#define TK_IF                             76
+#define TK_EXISTS                         77
 #define TK_PPS                            78
 #define TK_TSERIES                        79
 #define TK_DBS                            80

src/mnode/src/mnodeTable.c

@@ -2090,6 +2090,9 @@ static int32_t mnodeDoGetChildTableMeta(SMnodeMsg *pMsg, STableMetaMsg *pMeta) {
   pMeta->precision = pDb->cfg.precision;
   pMeta->tableType = pTable->info.type;
   tstrncpy(pMeta->tableId, pTable->info.tableId, TSDB_TABLE_FNAME_LEN);
+  if (pTable->superTable) {
+    tstrncpy(pMeta->sTableId, pTable->superTable->info.tableId, TSDB_TABLE_FNAME_LEN);
+  }
 
   if (pTable->info.type == TSDB_CHILD_TABLE) {
     pMeta->sversion     = htons(pTable->superTable->sversion);

src/query/inc/sql.y

@@ -80,6 +80,7 @@ cmd ::= SHOW GRANTS.     { setShowOptions(pInfo, TSDB_MGMT_TABLE_GRANTS, 0, 0);
 cmd ::= SHOW VNODES.                { setShowOptions(pInfo, TSDB_MGMT_TABLE_VNODES, 0, 0); }
 cmd ::= SHOW VNODES IPTOKEN(X).     { setShowOptions(pInfo, TSDB_MGMT_TABLE_VNODES, &X, 0); }
 
+
 %type dbPrefix {SStrToken}
 dbPrefix(A) ::=.                   {A.n = 0; A.type = 0;}
 dbPrefix(A) ::= ids(X) DOT.        {A = X;  }
@@ -88,6 +89,15 @@ dbPrefix(A) ::= ids(X) DOT.        {A = X;  }
 cpxName(A) ::= .             {A.n = 0;  }
 cpxName(A) ::= DOT ids(Y).   {A = Y; A.n += 1;    }
 
+cmd ::= SHOW CREATE TABLE ids(X) cpxName(Y).    {
+   X.n += Y.n;
+   setDCLSQLElems(pInfo, TSDB_SQL_SHOW_CREATE_TABLE, 1, &X);
+}    
+
+cmd ::= SHOW CREATE DATABASE ids(X). {
+  setDCLSQLElems(pInfo, TSDB_SQL_SHOW_CREATE_DATABASE, 1, &X);
+} 
+
 cmd ::= SHOW dbPrefix(X) TABLES.         {
     setShowOptions(pInfo, TSDB_MGMT_TABLE_TABLE, &X, 0);
 }