fix: first run without tag cond

source/dnode/vnode/src/meta/metaQuery.c

@@ -427,7 +427,7 @@ SMCtbCursor *metaOpenCtbCursor(void* pVnode, tb_uid_t uid, int lock) {
     metaRLock(pMeta);
   }
 
-  ret = tdbTbcOpen(pMeta->pCtbIdx, &pCtbCur->pCur, NULL);
+  ret = tdbTbcOpen(pMeta->pCtbIdx, (TBC**)&pCtbCur->pCur, NULL);
   if (ret < 0) {
     metaULock(pMeta);
     taosMemoryFree(pCtbCur);
@@ -1365,7 +1365,7 @@ int32_t metaGetTableTagsByUids(void *pVnode, int64_t suid, SArray *uidList) {
 }
 
 int32_t metaGetTableTags(void *pVnode, uint64_t suid, SArray *pUidTagInfo) {
-  SMCtbCursor *pCur = metaOpenCtbCursor(((SVnode *)pVnode)->pMeta, suid, 1);
+  SMCtbCursor *pCur = metaOpenCtbCursor(pVnode, suid, 1);
 
   // If len > 0 means there already have uids, and we only want the
   // tags of the specified tables, of which uid in the uid list. Otherwise, all table tags are retrieved and kept

source/dnode/vnode/src/vnd/vnodeQuery.c

@@ -440,7 +440,7 @@ int32_t vnodeGetTableList(void* pVnode, int8_t type, SArray* pList) {
 }
 
 int32_t vnodeGetAllTableList(SVnode *pVnode, uint64_t uid, SArray *list) {
-  SMCtbCursor *pCur = metaOpenCtbCursor(pVnode->pMeta, uid, 1);
+  SMCtbCursor *pCur = metaOpenCtbCursor(pVnode, uid, 1);
 
   while (1) {
     tb_uid_t id = metaCtbCursorNext(pCur);
@@ -462,7 +462,7 @@ int32_t vnodeGetCtbIdListByFilter(SVnode *pVnode, int64_t suid, SArray *list, bo
 
 int32_t vnodeGetCtbIdList(void *pVnode, int64_t suid, SArray *list) {
   SVnode      *pVnodeObj = pVnode;
-  SMCtbCursor *pCur = metaOpenCtbCursor(pVnodeObj->pMeta, suid, 1);
+  SMCtbCursor *pCur = metaOpenCtbCursor(pVnodeObj, suid, 1);
 
   while (1) {
     tb_uid_t id = metaCtbCursorNext(pCur);
@@ -521,7 +521,7 @@ int32_t vnodeGetStbIdListByFilter(SVnode *pVnode, int64_t suid, SArray *list, bo
 }
 
 int32_t vnodeGetCtbNum(SVnode *pVnode, int64_t suid, int64_t *num) {
-  SMCtbCursor *pCur = metaOpenCtbCursor(pVnode->pMeta, suid, 0);
+  SMCtbCursor *pCur = metaOpenCtbCursor(pVnode, suid, 0);
   if (!pCur) {
     return TSDB_CODE_FAILED;
   }

source/libs/executor/src/operator.c

@@ -371,6 +371,7 @@ SOperatorInfo* createOperator(SPhysiNode* pPhyNode, SExecTaskInfo* pTaskInfo, SR
       pOperator = createTableCountScanOperatorInfo(pHandle, pTblCountScanNode, pTaskInfo);
     } else if (QUERY_NODE_PHYSICAL_PLAN_TAG_SCAN == type) {
       STagScanPhysiNode* pTagScanPhyNode = (STagScanPhysiNode*)pPhyNode;
+      pTagScanPhyNode->onlyMetaCtbIdx = true;
       STableListInfo*    pTableListInfo = tableListCreate();
       if (!pTagScanPhyNode->onlyMetaCtbIdx) {
         int32_t code = createScanTableListInfo((SScanPhysiNode*)pTagScanPhyNode, NULL, false, pHandle, pTableListInfo, pTagCond,

source/libs/executor/src/scanoperator.c

@@ -2922,7 +2922,8 @@ static SSDataBlock* doTagScanFromCtbIdx(SOperatorInfo* pOperator) {
   SArray* aFilterIdxs = taosArrayInit(pOperator->resultInfo.capacity, sizeof(int32_t));
 
   while (1) {
-    while (count < pOperator->resultInfo.capacity) {
+    int32_t numTables = 0;
+    while (numTables < pOperator->resultInfo.capacity) {
       SMCtbCursor* pCur = pInfo->pCtbCursor;
       tb_uid_t     uid = pAPI->metaFn.ctbCursorNext(pInfo->pCtbCursor);
       if (uid == 0) {
@@ -2932,14 +2933,19 @@ static SSDataBlock* doTagScanFromCtbIdx(SOperatorInfo* pOperator) {
       info.pTagVal = taosMemoryMalloc(pCur->vLen);
       memcpy(info.pTagVal, pCur->pVal, pCur->vLen);
       taosArrayPush(aUidTags, &info);
+      ++numTables;
     }
 
-    int32_t numTables = taosArrayGetSize(aUidTags);
     if (numTables == 0) {
       break;
     }
-
-    tagScanFilterByTagCond(aUidTags, pInfo->pTagCond, pInfo->readHandle.vnode, aFilterIdxs, pAPI);
+    if (pInfo->pTagCond != NULL) {
+      tagScanFilterByTagCond(aUidTags, pInfo->pTagCond, pInfo->readHandle.vnode, aFilterIdxs, pAPI);
+    } else {
+      for (int i = 0; i < numTables; ++i) {
+        taosArrayPush(aFilterIdxs, &i);
+      }
+    }
 
     tagScanFillResultBlock(pOperator, pRes, aUidTags, aFilterIdxs, pAPI);
     count = taosArrayGetSize(aFilterIdxs);
@@ -2955,6 +2961,7 @@ static SSDataBlock* doTagScanFromCtbIdx(SOperatorInfo* pOperator) {
   taosArrayDestroy(aFilterIdxs);
   taosArrayDestroyEx(aUidTags, tagScanFreeUidTag);
 
+  pRes->info.rows = count;
   pOperator->resultInfo.totalRows += count;
   return (pRes->info.rows == 0) ? NULL : pInfo->pRes;
 }