feat: add multiple group tsdb reads to table merge scan

fd79fcc4 · shenglian zhou · c99f7cac · fd79fcc4
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source/libs/executor/src/scanoperator.c source/libs/executor/src/scanoperator.c +5 -1

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--- a/source/libs/executor/src/scanoperator.c
+++ b/source/libs/executor/src/scanoperator.c
@@ -2324,6 +2324,10 @@ SSDataBlock* doTableMergeScan(SOperatorInfo* pOperator) {
  if (!pInfo->hasGroupId) {
    pInfo->hasGroupId = true;
    
+    if (tableListSize == 0) {
+      doSetOperatorCompleted(pOperator);
+      return NULL;
+    }
    pInfo->tableStartIndex = 0;
    pInfo->groupId = ((STableKeyInfo*)taosArrayGet(pInfo->tableListInfo->pTableList, pInfo->tableStartIndex))->groupId;
    startGroupTableMergeScan(pOperator);