diff --git a/source/dnode/vnode/src/tsdb/tsdbMergeTree.c b/source/dnode/vnode/src/tsdb/tsdbMergeTree.c
index 918f2763b1..7301338438 100644
--- a/source/dnode/vnode/src/tsdb/tsdbMergeTree.c
+++ b/source/dnode/vnode/src/tsdb/tsdbMergeTree.c
@@ -75,6 +75,12 @@ void getLastBlockLoadInfo(SSttBlockLoadInfo *pLoadInfo, int64_t *blocks, double
   }
 }
 
+static void freeTombBlock(void* param) {
+  STombBlock** pTombBlock = (STombBlock**) param;
+  tTombBlockDestroy(*pTombBlock);
+  taosMemoryFree(*pTombBlock);
+}
+
 void *destroyLastBlockLoadInfo(SSttBlockLoadInfo *pLoadInfo) {
   if (pLoadInfo == NULL) {
     return NULL;
@@ -91,6 +97,8 @@ void *destroyLastBlockLoadInfo(SSttBlockLoadInfo *pLoadInfo) {
     taosArrayDestroy(pLoadInfo[i].aSttBlk);
   }
 
+  taosArrayDestroyEx(pLoadInfo->pTombBlockArray, freeTombBlock);
+
   taosMemoryFree(pLoadInfo);
   return NULL;
 }
diff --git a/source/dnode/vnode/src/tsdb/tsdbRead2.c b/source/dnode/vnode/src/tsdb/tsdbRead2.c
index 71922e82cc..ab0ff0d8ec 100644
--- a/source/dnode/vnode/src/tsdb/tsdbRead2.c
+++ b/source/dnode/vnode/src/tsdb/tsdbRead2.c
@@ -566,7 +566,7 @@ static int32_t initFilesetIterator(SFilesetIter* pIter, TFileSetArray* pFileSetA
   if (pLReader->pInfo == NULL) {
     // here we ignore the first column, which is always be the primary timestamp column
     SBlockLoadSuppInfo* pInfo = &pReader->suppInfo;
-
+    // todo dynamic number of stt
     int32_t numOfStt = pReader->pTsdb->pVnode->config.sttTrigger;
     pLReader->pInfo = tCreateLastBlockLoadInfo(pReader->pSchema, &pInfo->colId[1], pInfo->numOfCols - 1, numOfStt);
     if (pLReader->pInfo == NULL) {