feat: add multiple group tsdb reads to table merge scan

source/libs/executor/src/scanoperator.c

@@ -2212,6 +2212,7 @@ int32_t startGroupTableMergeScan(SOperatorInfo* pOperator) {
   STableMergeScanInfo* pInfo = pOperator->info;
   SExecTaskInfo*       pTaskInfo = pOperator->pTaskInfo;
 
+  {
     size_t  tableListSize = taosArrayGetSize(pInfo->tableListInfo->pTableList);
     int32_t i = pInfo->tableStartIndex + 1;
     for (; i < tableListSize; ++i) {
@@ -2221,6 +2222,7 @@ int32_t startGroupTableMergeScan(SOperatorInfo* pOperator) {
       }
     }
     pInfo->tableEndIndex = i - 1;
+  }
 
   int32_t tableStartIdx = pInfo->tableStartIndex;
   int32_t tableEndIdx = pInfo->tableEndIndex;