Merge pull request #6344 from taosdata/hotfix/TD-4443-2

[TD-4443]timestamp show issue in new join

src/client/src/tscUtil.c

@@ -1119,6 +1119,8 @@ void handleDownstreamOperator(SSqlObj** pSqlObjList, int32_t numOfUpstream, SQue
 
     SOperatorInfo* pSourceOperator = createDummyInputOperator(pSqlObjList[0], pSchema, numOfCol1, pFilterInfo, numOfFilterCols);
 
+    pOutput->precision = pSqlObjList[0]->res.precision;
+    
     SSchema* schema = NULL;
     if (px->numOfTables > 1) {
       SOperatorInfo** p = calloc(px->numOfTables, POINTER_BYTES);