use taos_query instead of taos_stmt for child table batch less than 10 rows

src/client/src/tscParseLineProtocol.c

@@ -750,7 +750,96 @@ static int32_t arrangePointsByChildTableName(TAOS_SML_DATA_POINT* points, int nu
   return 0;
 }
 
-static int32_t applyChildTableDataPoints(TAOS* taos, char* cTableName, char* sTableName, SSmlSTableSchema* sTableSchema,
+static int32_t applyChildTableDataPointsWithInsertSQL(TAOS* taos, char* cTableName, char* sTableName, SSmlSTableSchema* sTableSchema,
+                                                  SArray* cTablePoints, size_t rowSize, SSmlLinesInfo* info) {
+  int32_t code = TSDB_CODE_SUCCESS;
+  size_t numTags = taosArrayGetSize(sTableSchema->tags);
+  size_t numCols = taosArrayGetSize(sTableSchema->fields);
+  size_t rows = taosArrayGetSize(cTablePoints);
+  SArray* tagsSchema = sTableSchema->tags;
+  SArray* colsSchema = sTableSchema->fields;
+
+  TAOS_SML_KV* tagKVs[TSDB_MAX_TAGS] = {0};
+  for (int i= 0; i < rows; ++i) {
+    TAOS_SML_DATA_POINT * pDataPoint = taosArrayGetP(cTablePoints, i);
+    for (int j = 0; j < pDataPoint->tagNum; ++j) {
+      TAOS_SML_KV* kv = pDataPoint->tags + j;
+      tagKVs[kv->fieldSchemaIdx] = kv;
+    }
+  }
+
+  char* sql = malloc(tsMaxSQLStringLen+1);
+  if (sql == NULL) {
+    tscError("malloc sql memory error");
+    return TSDB_CODE_TSC_OUT_OF_MEMORY;
+  }
+
+  int32_t freeBytes = tsMaxSQLStringLen + 1 ;
+  sprintf(sql, "insert into ? using %s (", sTableName);
+  for (int i = 0; i < numTags; ++i) {
+    SSchema* tagSchema = taosArrayGet(tagsSchema, i);
+    snprintf(sql+strlen(sql), freeBytes-strlen(sql), "%s,", tagSchema->name);
+  }
+  snprintf(sql + strlen(sql) - 1, freeBytes-strlen(sql)+1, ")");
+
+  snprintf(sql + strlen(sql), freeBytes-strlen(sql), " tags (");
+
+//  for (int i = 0; i < numTags; ++i) {
+//    snprintf(sql+strlen(sql), freeBytes-strlen(sql), "?,");
+//  }
+  for (int i = 0; i < numTags; ++i) {
+    if (tagKVs[i] == NULL) {
+      snprintf(sql + strlen(sql), freeBytes-strlen(sql), "NULL,");
+    } else {
+      TAOS_SML_KV* kv =  tagKVs[i];
+      int32_t len = 0;
+      converToStr(sql+strlen(sql), kv->type, kv->value, kv->length, &len);
+      *(sql+strlen(sql)+len)='\0';
+    }
+  }
+  snprintf(sql + strlen(sql) - 1, freeBytes-strlen(sql)+1, ") (");
+
+  for (int i = 0; i < numCols; ++i) {
+    SSchema* colSchema = taosArrayGet(colsSchema, i);
+    snprintf(sql+strlen(sql), freeBytes-strlen(sql), "%s,", colSchema->name);
+  }
+  snprintf(sql + strlen(sql)-1, freeBytes-strlen(sql)+1, ") values ");
+
+  TAOS_SML_KV** colKVs = malloc(numCols*sizeof(TAOS_SML_KV*));
+  for (int r = 0; r < rows; ++r) {
+    snprintf(sql + strlen(sql)-1, freeBytes-strlen(sql)+1, "(");
+
+    memset(colKVs, 0, numCols*sizeof(TAOS_SML_KV*));
+
+    TAOS_SML_DATA_POINT* point = taosArrayGetP(cTablePoints, r);
+    for (int i = 0; i < point->fieldNum; ++i) {
+      TAOS_SML_KV* kv = point->fields + i;
+      colKVs[kv->fieldSchemaIdx] = kv;
+    }
+
+    for (int i = 0; i < numCols; ++i) {
+      if (colKVs[i] == NULL) {
+        snprintf(sql + strlen(sql), freeBytes-strlen(sql), "NULL,");
+      } else {
+        TAOS_SML_KV* kv =  colKVs[i];
+        int32_t len = 0;
+        converToStr(sql+strlen(sql), kv->type, kv->value, kv->length, &len);
+        *(sql+strlen(sql)+len)='\0';
+      }
+    }
+    snprintf(sql + strlen(sql) - 1, freeBytes - strlen(sql) + 1, ")");
+  }
+  free(colKVs);
+  sql[strlen(sql)] = '\0';
+
+  tscDebug("SML:0x%"PRIx64" insert child table table %s of super table %s : %s", info->id, cTableName, sTableName, sql);
+  TAOS_RES* res = taos_query(taos, sql);
+  code = taos_errno(res);
+  info->affectedRows = taos_affected_rows(res);
+  return code;
+}
+
+static int32_t applyChildTableDataPointsWithStmt(TAOS* taos, char* cTableName, char* sTableName, SSmlSTableSchema* sTableSchema,
                                          SArray* cTablePoints, size_t rowSize, SSmlLinesInfo* info) {
   size_t numTags = taosArrayGetSize(sTableSchema->tags);
   size_t numCols = taosArrayGetSize(sTableSchema->fields);
@@ -836,6 +925,7 @@ static int32_t applyChildTableDataPoints(TAOS* taos, char* cTableName, char* sTa
   taosArrayDestroy(tagBinds);
   return code;
 }
+
 static int32_t insertChildTablePointsBatch(TAOS* taos, char* cTableName, char* sTableName,
                                            SArray* tagsSchema, SArray* tagsBind,
                                            SArray* colsSchema, SArray* rowsBind,
@@ -1004,6 +1094,18 @@ static int32_t doInsertChildTablePoints(TAOS* taos, char* sql, char* cTableName,
   return 0;
 }
 
+static int32_t applyChildTableDataPoints(TAOS* taos, char* cTableName, char* sTableName, SSmlSTableSchema* sTableSchema,
+                                                 SArray* cTablePoints, size_t rowSize, SSmlLinesInfo* info) {
+  int32_t code = TSDB_CODE_SUCCESS;
+  size_t childTableDataPoints = taosArrayGetSize(cTablePoints);
+  if (childTableDataPoints < 10) {
+    applyChildTableDataPointsWithInsertSQL(taos, cTableName, sTableName, sTableSchema, cTablePoints, rowSize, info);
+  } else {
+    applyChildTableDataPointsWithStmt(taos, cTableName, sTableName, sTableSchema, cTablePoints, rowSize, info);
+  }
+  return code;
+}
+
 static int32_t applyDataPoints(TAOS* taos, TAOS_SML_DATA_POINT* points, int32_t numPoints, SArray* stableSchemas, SSmlLinesInfo* info) {
   int32_t code = TSDB_CODE_SUCCESS;