Merge pull request #5270 from taosdata/feature/TD-2682

[TD-2682]add showed result rows num limitation in taos

src/client/inc/tsclient.h

@@ -449,6 +449,9 @@ void doAsyncQuery(STscObj *pObj, SSqlObj *pSql, __async_cb_func_t fp, void *para
 void tscImportDataFromFile(SSqlObj *pSql);
 void tscInitResObjForLocalQuery(SSqlObj *pObj, int32_t numOfRes, int32_t rowLen);
 bool tscIsUpdateQuery(SSqlObj* pSql);
+char* tscGetSqlStr(SSqlObj* pSql);
+bool tscIsQueryWithLimit(SSqlObj* pSql);
+
 bool tscHasReachLimitation(SQueryInfo *pQueryInfo, SSqlRes *pRes);
 
 char *tscGetErrorMsgPayload(SSqlCmd *pCmd);

src/client/src/tscUtil.c

@@ -2310,6 +2310,35 @@ bool tscIsUpdateQuery(SSqlObj* pSql) {
   return ((pCmd->command >= TSDB_SQL_INSERT && pCmd->command <= TSDB_SQL_DROP_DNODE) || TSDB_SQL_USE_DB == pCmd->command);
 }
 
+char* tscGetSqlStr(SSqlObj* pSql) {
+  if (pSql == NULL || pSql->signature != pSql) {
+    return NULL;
+  }
+
+  return pSql->sqlstr;
+}
+
+bool tscIsQueryWithLimit(SSqlObj* pSql) {
+  if (pSql == NULL || pSql->signature != pSql) {
+    return false;
+  }
+
+  SSqlCmd* pCmd = &pSql->cmd;
+  for (int32_t i = 0; i < pCmd->numOfClause; ++i) {
+    SQueryInfo* pqi = tscGetQueryInfoDetailSafely(pCmd, i);
+    if (pqi == NULL) {
+      continue;
+    }
+
+    if (pqi->limit.limit > 0) {
+      return true;
+    }
+  }
+  
+  return false;
+}
+
+
 int32_t tscSQLSyntaxErrMsg(char* msg, const char* additionalInfo,  const char* sql) {
   const char* msgFormat1 = "syntax error near \'%s\'";
   const char* msgFormat2 = "syntax error near \'%s\' (%s)";

src/kit/shell/inc/shell.h

@@ -30,6 +30,8 @@
 #define MAX_COMMAND_SIZE       65536
 #define HISTORY_FILE           ".taos_history"
 
+#define DEFAULT_RES_SHOW_NUM   100
+
 typedef struct SShellHistory {
   char* hist[MAX_HISTORY_SIZE];
   int   hstart;

src/kit/shell/src/shellEngine.c

@@ -324,7 +324,8 @@ void shellRunCommandOnServer(TAOS *con, char command[]) {
   }
 
   if (!tscIsUpdateQuery(pSql)) {  // select and show kinds of commands
-    int error_no = 0;
+    int error_no = 0;    
+  
     int numOfRows = shellDumpResult(pSql, fname, &error_no, printMode);
     if (numOfRows < 0) {
       atomic_store_64(&result, 0);
@@ -659,6 +660,17 @@ static void printField(const char* val, TAOS_FIELD* field, int width, int32_t le
 }
 
 
+bool isSelectQuery(TAOS_RES* tres) {
+  char *sql = tscGetSqlStr(tres);
+
+  if (regex_match(sql, "^[\t ]*select[ \t]*", REG_EXTENDED | REG_ICASE)) {
+    return true;
+  }
+
+  return false;
+}
+
+
 static int verticalPrintResult(TAOS_RES* tres) {
   TAOS_ROW row = taos_fetch_row(tres);
   if (row == NULL) {
@@ -677,18 +689,33 @@ static int verticalPrintResult(TAOS_RES* tres) {
     }
   }
 
+  uint64_t resShowMaxNum = UINT64_MAX;
+
+  if (args.commands == NULL && args.file[0] == 0 && isSelectQuery(tres) && !tscIsQueryWithLimit(tres)) {
+    resShowMaxNum = DEFAULT_RES_SHOW_NUM;
+  }
+
   int numOfRows = 0;
-  do {
-    printf("*************************** %d.row ***************************\n", numOfRows + 1);
-    int32_t* length = taos_fetch_lengths(tres);
-    for (int i = 0; i < num_fields; i++) {
-      TAOS_FIELD* field = fields + i;
+  int showMore = 1;
+  do {  
+    if (numOfRows < resShowMaxNum) {
+      printf("*************************** %d.row ***************************\n", numOfRows + 1);
 
-      int padding = (int)(maxColNameLen - strlen(field->name));
-      printf("%*.s%s: ", padding, " ", field->name);
+      int32_t* length = taos_fetch_lengths(tres);
 
-      printField((const char*)row[i], field, 0, length[i], precision);
-      putchar('\n');
+      for (int i = 0; i < num_fields; i++) {
+        TAOS_FIELD* field = fields + i;
+
+        int padding = (int)(maxColNameLen - strlen(field->name));
+        printf("%*.s%s: ", padding, " ", field->name);
+
+        printField((const char*)row[i], field, 0, length[i], precision);
+        putchar('\n');
+      }
+    } else if (showMore) {
+        printf("[100 Rows showed, and more rows are fetching but will not be showed. You can ctrl+c to stop or wait.]\n");
+        printf("[You can add limit statement to get more or redirect results to specific file to get all.]\n");
+        showMore = 0;
     }
 
     numOfRows++;
@@ -795,16 +822,31 @@ static int horizontalPrintResult(TAOS_RES* tres) {
 
   printHeader(fields, width, num_fields);
 
+  uint64_t resShowMaxNum = UINT64_MAX;
+
+  if (args.commands == NULL && args.file[0] == 0 && isSelectQuery(tres) && !tscIsQueryWithLimit(tres)) {
+    resShowMaxNum = DEFAULT_RES_SHOW_NUM;
+  }
+
   int numOfRows = 0;
+  int showMore = 1;
+ 
   do {
     int32_t* length = taos_fetch_lengths(tres);
-    for (int i = 0; i < num_fields; i++) {
-      putchar(' ');
-      printField((const char*)row[i], fields + i, width[i], length[i], precision);
-      putchar(' ');
-      putchar('|');
+    if (numOfRows < resShowMaxNum) {
+      for (int i = 0; i < num_fields; i++) {
+        putchar(' ');
+        printField((const char*)row[i], fields + i, width[i], length[i], precision);
+        putchar(' ');
+        putchar('|');
+      }
+      putchar('\n');
+    } else if (showMore) {
+        printf("[100 Rows showed, and more rows are fetching but will not be showed. You can ctrl+c to stop or wait.]\n");
+        printf("[You can add limit statement to show more or redirect results to specific file to get all.]\n");
+        showMore = 0;
     }
-    putchar('\n');
+    
     numOfRows++;
     row = taos_fetch_row(tres);
   } while(row != NULL);