diff --git a/src/client/src/tscParseInsert.c b/src/client/src/tscParseInsert.c
index 4bfdca882c1b00cdf96a1ab87c7dd3e2277dad1c..9e5e9244fa6ec95bd0994ab9dff23ab5d8f11a98 100644
--- a/src/client/src/tscParseInsert.c
+++ b/src/client/src/tscParseInsert.c
@@ -783,12 +783,12 @@ static int32_t tscCheckIfCreateTable(char **sqlstr, SSqlObj *pSql) {
     sToken = tStrGetToken(sql, &index, false, 0, NULL);
     sql += index;
 
-    STagData *pTag = (STagData *)pCmd->payload;
+    tscAllocPayload(pCmd, sizeof(STagData));
+    STagData *pTag = (STagData *) pCmd->payload;
+
     memset(pTag, 0, sizeof(STagData));
     
-    /*
-     * the source super table is moved to the secondary position of the pTableMetaInfo list
-     */
+    //the source super table is moved to the secondary position of the pTableMetaInfo list
     if (pQueryInfo->numOfTables < 2) {
       tscAddEmptyMetaInfo(pQueryInfo);
     }
@@ -889,9 +889,8 @@ static int32_t tscCheckIfCreateTable(char **sqlstr, SSqlObj *pSql) {
       index = 0;
       sToken = tStrGetToken(sql, &index, true, numOfIgnoreToken, &ignoreTokenTypes);
       sql += index;
-      if (sToken.n == 0) {
-        break;
-      } else if (sToken.type == TK_RP) {
+
+      if (sToken.n == 0 || sToken.type == TK_RP) {
         break;
       }
 
@@ -905,11 +904,6 @@ static int32_t tscCheckIfCreateTable(char **sqlstr, SSqlObj *pSql) {
       if (code != TSDB_CODE_SUCCESS) {
         return code;
       }
-
-      if ((pTagSchema[colIndex].type == TSDB_DATA_TYPE_BINARY || pTagSchema[colIndex].type == TSDB_DATA_TYPE_NCHAR) &&
-          sToken.n > pTagSchema[colIndex].bytes) {
-        return tscInvalidSQLErrMsg(pCmd->payload, "string too long", sToken.z);
-      }
     }
 
     index = 0;
@@ -1034,9 +1028,9 @@ int tsParseInsertSql(SSqlObj *pSql) {
   }
 
   // TODO: 2048 is added because TSDB_MAX_TAGS_LEN now is 65536, but TSDB_PAYLOAD_SIZE is 65380
-  if ((code = tscAllocPayload(pCmd, TSDB_PAYLOAD_SIZE + 2048)) != TSDB_CODE_SUCCESS) {
-    return code;
-  }
+//  if ((code = tscAllocPayload(pCmd, TSDB_PAYLOAD_SIZE + 2048)) != TSDB_CODE_SUCCESS) {
+//    return code;
+//  }
 
   if (NULL == pCmd->pTableList) {
     pCmd->pTableList = taosHashInit(128, taosGetDefaultHashFunction(TSDB_DATA_TYPE_BIGINT), false);
diff --git a/src/client/src/tscUtil.c b/src/client/src/tscUtil.c
index 324c042554c8b86daa77ab087ae91699af0d2b11..4d90caddcb12bef33e7ec41f9569cd4318640dd8 100644
--- a/src/client/src/tscUtil.c
+++ b/src/client/src/tscUtil.c
@@ -608,6 +608,9 @@ static int trimDataBlock(void* pDataBlock, STableDataBlocks* pTableDataBlock) {
 int32_t tscMergeTableDataBlocks(SSqlObj* pSql, SArray* pTableDataBlockList) {
   SSqlCmd* pCmd = &pSql->cmd;
 
+  // the expanded size when a row data is converted to SDataRow format
+  const int32_t MAX_EXPAND_SIZE = TD_DATA_ROW_HEAD_SIZE + TYPE_BYTES[TSDB_DATA_TYPE_BINARY];
+
   void* pVnodeDataBlockHashList = taosHashInit(128, taosGetDefaultHashFunction(TSDB_DATA_TYPE_BIGINT), false);
   SArray* pVnodeDataBlockList = taosArrayInit(8, POINTER_BYTES);
 
@@ -627,7 +630,9 @@ int32_t tscMergeTableDataBlocks(SSqlObj* pSql, SArray* pTableDataBlockList) {
       return ret;
     }
 
-    int64_t destSize = dataBuf->size + pOneTableBlock->size + pOneTableBlock->size*sizeof(int32_t)*2;
+    SSubmitBlk* pBlocks = (SSubmitBlk*) pOneTableBlock->pData;
+    int64_t destSize = dataBuf->size + pOneTableBlock->size + pBlocks->numOfRows * MAX_EXPAND_SIZE;
+
     if (dataBuf->nAllocSize < destSize) {
       while (dataBuf->nAllocSize < destSize) {
         dataBuf->nAllocSize = dataBuf->nAllocSize * 1.5;
@@ -648,26 +653,30 @@ int32_t tscMergeTableDataBlocks(SSqlObj* pSql, SArray* pTableDataBlockList) {
       }
     }
 
-    SSubmitBlk* pBlocks = (SSubmitBlk*) pOneTableBlock->pData;
     tscSortRemoveDataBlockDupRows(pOneTableBlock);
-
     char* ekey = (char*)pBlocks->data + pOneTableBlock->rowSize*(pBlocks->numOfRows-1);
     
     tscTrace("%p tableId:%s, sid:%d rows:%d sversion:%d skey:%" PRId64 ", ekey:%" PRId64, pSql, pOneTableBlock->tableId,
         pBlocks->tid, pBlocks->numOfRows, pBlocks->sversion, GET_INT64_VAL(pBlocks->data), GET_INT64_VAL(ekey));
 
-    int32_t len = pBlocks->numOfRows * (pOneTableBlock->rowSize + sizeof(int32_t) * 2);
-    
+
+    int32_t len = pBlocks->numOfRows * (pOneTableBlock->rowSize + MAX_EXPAND_SIZE);
+
     pBlocks->tid = htonl(pBlocks->tid);
     pBlocks->uid = htobe64(pBlocks->uid);
     pBlocks->sversion = htonl(pBlocks->sversion);
     pBlocks->numOfRows = htons(pBlocks->numOfRows);
-    
-    pBlocks->len = htonl(len);
-    
+
     // erase the empty space reserved for binary data
-    len = trimDataBlock(dataBuf->pData + dataBuf->size, pOneTableBlock);
-    dataBuf->size += (len + sizeof(SSubmitBlk));
+    int32_t finalLen = trimDataBlock(dataBuf->pData + dataBuf->size, pOneTableBlock);
+    assert(finalLen <= len);
+
+    dataBuf->size += (finalLen + sizeof(SSubmitBlk));
+    assert(dataBuf->size <= dataBuf->nAllocSize);
+
+    // the length does not include the SSubmitBlk structure
+    pBlocks->len = htonl(finalLen);
+
     dataBuf->numOfTables += 1;
   }