diff --git a/src/tsdb/src/tsdbRead.c b/src/tsdb/src/tsdbRead.c
index f0a2694b608363518c76b63d2e1e674330fba2fa..f13e5e5de83fbe70ab2be6c17a859035ba26a5c0 100644
--- a/src/tsdb/src/tsdbRead.c
+++ b/src/tsdb/src/tsdbRead.c
@@ -808,7 +808,7 @@ static int32_t handleDataMergeIfNeeded(STsdbQueryHandle* pQueryHandle, SCompBloc
       return code;
     }
 
-    doMergeTwoLevelData(pQueryHandle, pCheckInfo, pBlock);
+//    doMergeTwoLevelData(pQueryHandle, pCheckInfo, pBlock);
   } else {
     /*
      * no data in cache, only load data from file
@@ -871,7 +871,7 @@ static int32_t loadFileDataBlock(STsdbQueryHandle* pQueryHandle, SCompBlock* pBl
       }
 
       assert(pCheckInfo->lastKey <= pBlock->keyLast);
-      doMergeTwoLevelData(pQueryHandle, pCheckInfo, pBlock);
+//      doMergeTwoLevelData(pQueryHandle, pCheckInfo, pBlock);
     } else {  // the whole block is loaded in to buffer
       cur->pos = ASCENDING_TRAVERSE(pQueryHandle->order)? 0:(pBlock->numOfRows - 1);
       code = handleDataMergeIfNeeded(pQueryHandle, pBlock, pCheckInfo);
@@ -891,7 +891,7 @@ static int32_t loadFileDataBlock(STsdbQueryHandle* pQueryHandle, SCompBlock* pBl
       }
 
       assert(pCheckInfo->lastKey >= pBlock->keyFirst);
-      doMergeTwoLevelData(pQueryHandle, pCheckInfo, pBlock);
+//      doMergeTwoLevelData(pQueryHandle, pCheckInfo, pBlock);
     } else {
       cur->pos = ASCENDING_TRAVERSE(pQueryHandle->order)? 0:(pBlock->numOfRows-1);
       code = handleDataMergeIfNeeded(pQueryHandle, pBlock, pCheckInfo);