fix: add init add check it

source/dnode/vnode/src/inc/tsdb.h

@@ -792,6 +792,7 @@ typedef struct SLDataIter {
   SVersionRange          verRange;
   SSttBlockLoadInfo     *pBlockLoadInfo;
   bool                   ignoreEarlierTs;
+  bool                   bInit;
   struct SSttFileReader *pReader;
 } SLDataIter;
 

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

@@ -850,7 +850,7 @@ int32_t tMergeTreeOpen2(SMergeTree *pMTree, SMergeTreeConf *pConf) {
       if (code != TSDB_CODE_SUCCESS) {
         goto _end;
       }
-
+      pIter->bInit = true;
       bool hasVal = tLDataIterNextRow(pIter, pMTree->idStr);
       if (hasVal) {
         tMergeTreeAddIter(pMTree, pIter);