diff --git a/source/dnode/vnode/CMakeLists.txt b/source/dnode/vnode/CMakeLists.txt
index 24c4f2912c..ce5c1815b6 100644
--- a/source/dnode/vnode/CMakeLists.txt
+++ b/source/dnode/vnode/CMakeLists.txt
@@ -43,7 +43,6 @@ target_sources(
     "src/tsdb/tsdbOpen.c"
     "src/tsdb/tsdbMemTable.c"
     "src/tsdb/tsdbRead.c"
-    "src/tsdb/tsdbReadImpl.c"
     "src/tsdb/tsdbCache.c"
     "src/tsdb/tsdbWrite.c"
     "src/tsdb/tsdbReaderWriter.c"
diff --git a/source/dnode/vnode/src/tsdb/tsdbReadImpl.c b/source/dnode/vnode/src/tsdb/tsdbReadImpl.c
deleted file mode 100644
index fe0d3a1b6f..0000000000
--- a/source/dnode/vnode/src/tsdb/tsdbReadImpl.c
+++ /dev/null
@@ -1,16 +0,0 @@
-/*
- * Copyright (c) 2019 TAOS Data, Inc. <jhtao@taosdata.com>
- *
- * This program is free software: you can use, redistribute, and/or modify
- * it under the terms of the GNU Affero General Public License, version 3
- * or later ("AGPL"), as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.
- *
- * You should have received a copy of the GNU Affero General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-#include "tsdb.h"
diff --git a/source/dnode/vnode/src/tsdb/tsdbReaderWriter.c b/source/dnode/vnode/src/tsdb/tsdbReaderWriter.c
index 98decfe002..2c5f837f95 100644
--- a/source/dnode/vnode/src/tsdb/tsdbReaderWriter.c
+++ b/source/dnode/vnode/src/tsdb/tsdbReaderWriter.c
@@ -424,10 +424,12 @@ int32_t tsdbReadDelIdx(SDelFReader *pReader, SArray *aDelIdx, uint8_t **ppBuf) {
 
   ASSERT(n == size - sizeof(TSCKSUM));
 
+  tFree(pBuf);
   return code;
 
 _err:
   tsdbError("vgId:%d read del idx failed since %s", TD_VID(pReader->pTsdb->pVnode), tstrerror(code));
+  tFree(pBuf);
   return code;
 }
 
diff --git a/source/dnode/vnode/src/tsdb/tsdbUtil.c b/source/dnode/vnode/src/tsdb/tsdbUtil.c
index 24b7c08476..683aac0158 100644
--- a/source/dnode/vnode/src/tsdb/tsdbUtil.c
+++ b/source/dnode/vnode/src/tsdb/tsdbUtil.c
@@ -1016,7 +1016,7 @@ int32_t tBlockDataAppendRow(SBlockData *pBlockData, TSDBROW *pRow, STSchema *pTS
   SColData *pColData;
   SColVal  *pColVal;
 
-  ASSERT(nColData > 0);
+  if (nColData == 0) goto _exit;
 
   tRowIterInit(pIter, pRow, pTSchema);
   pColData = tBlockDataGetColDataByIdx(pBlockData, iColData);
@@ -1046,6 +1046,7 @@ int32_t tBlockDataAppendRow(SBlockData *pBlockData, TSDBROW *pRow, STSchema *pTS
     }
   }
 
+_exit:
   pBlockData->nRow++;
   return code;