move few lines pSupporter initilization code ahead to make easier cleanup.

src/system/detail/src/vnodeRead.c

@@ -654,26 +654,23 @@ void *vnodeQueryOnSingleTable(SMeterObj **pMetersObj, SSqlGroupbyExpr *pGroupbyE
         goto _error;
     }
     pSupporter->numOfMeters = 1;
+    pSupporter->pSidSet = NULL;
+    pSupporter->subgroupIdx = -1;
+    pSupporter->pMeterSidExtInfo = NULL;
+
+    pQInfo->pTableQuerySupporter = pSupporter;
 
     pSupporter->pMetersHashTable = taosInitHashTable(pSupporter->numOfMeters, taosIntHash_32, false);
     if (pSupporter->pMetersHashTable == NULL) {
-        tfree(pSupporter);
         *code = TSDB_CODE_SERV_OUT_OF_MEMORY;
         goto _error;
     }
     if (taosAddToHashTable(pSupporter->pMetersHashTable, (const char*) &pMetersObj[0]->sid, sizeof(pMeterObj[0].sid),
                 (char *)&pMetersObj[0], POINTER_BYTES) != 0) {
-        tfree(pSupporter);
         *code = TSDB_CODE_APP_ERROR;
         goto _error;
     }
 
-    pSupporter->pSidSet = NULL;
-    pSupporter->subgroupIdx = -1;
-    pSupporter->pMeterSidExtInfo = NULL;
-
-    pQInfo->pTableQuerySupporter = pSupporter;
-
     STSBuf *pTSBuf = NULL;
     if (pQueryMsg->tsLen > 0) {
       // open new file to save the result