fix: memory invalid read and perf issue

source/dnode/vnode/src/tsdb/tsdbMergeTree.c

@@ -483,12 +483,14 @@ int32_t tLDataIterOpen2(struct SLDataIter *pIter, SSttFileReader *pSttFileReader
     tsdbDebug("load the stt file info completed, elapsed time:%.2fms, %s", el, idStr);
   }
 
+/*
   bool exists = existsFromSttBlkStatis(pBlockLoadInfo->pSttStatisBlkArray, suid, uid, pIter->pReader);
   if (!exists) {
     pIter->iSttBlk = -1;
     pIter->pSttBlk = NULL;
     return TSDB_CODE_SUCCESS;
   }
+*/
 
   // find the start block, actually we could load the position to avoid repeatly searching for the start position when
   // the skey is updated.

source/libs/executor/src/groupcacheoperator.c

@@ -1079,8 +1079,8 @@ static int32_t getBlkFromGroupCache(struct SOperatorInfo* pOperator, SSDataBlock
   
   code = getBlkFromSessionCache(pOperator, pGcParam->sessionId, pSession, ppRes);
   if (NULL == *ppRes) {
-    taosHashRemove(pCtx->pSessions, &pGcParam->sessionId, sizeof(pGcParam->sessionId));
     qError("session %" PRId64 " in downstream %d total got %" PRId64 " rows", pGcParam->sessionId, pCtx->id, pSession->resRows);
+    taosHashRemove(pCtx->pSessions, &pGcParam->sessionId, sizeof(pGcParam->sessionId));
   } else {
     pSession->resRows += (*ppRes)->info.rows;
     qError("session %" PRId64 " in downstream %d got %" PRId64 " rows in one block", pGcParam->sessionId, pCtx->id, (*ppRes)->info.rows);