From 0b4606ec14219b2df5d47ff89f764b0e2de45960 Mon Sep 17 00:00:00 2001
From: Hongze Cheng <hzcheng@taosdata.com>
Date: Wed, 9 Sep 2020 11:12:01 +0800
Subject: [PATCH] fix TD-1387

---
 src/tsdb/src/tsdbRWHelper.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/tsdb/src/tsdbRWHelper.c b/src/tsdb/src/tsdbRWHelper.c
index 84f22918ec..632d299542 100644
--- a/src/tsdb/src/tsdbRWHelper.c
+++ b/src/tsdb/src/tsdbRWHelper.c
@@ -733,7 +733,7 @@ static int tsdbWriteBlockToFile(SRWHelper *pHelper, SFile *pFile, SDataCols *pDa
   int32_t lsize = tsize;
   int32_t keyLen = 0;
   for (int ncol = 0; ncol < pDataCols->numOfCols; ncol++) {
-    if (tcol >= nColsNotAllNull) break;
+    if (ncol != 0 && tcol >= nColsNotAllNull) break;
 
     SDataCol *pDataCol = pDataCols->cols + ncol;
     SCompCol *pCompCol = pCompData->cols + tcol;