From 563692222707e78a6bdda6f91b98c40db8406000 Mon Sep 17 00:00:00 2001
From: Hongze Cheng <hzcheng@taosdata.com>
Date: Tue, 17 May 2022 02:52:46 +0000
Subject: [PATCH] fix: drop column

---
 source/dnode/vnode/src/meta/metaTable.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/source/dnode/vnode/src/meta/metaTable.c b/source/dnode/vnode/src/meta/metaTable.c
index 6bfcc34c85..1aec4185b0 100644
--- a/source/dnode/vnode/src/meta/metaTable.c
+++ b/source/dnode/vnode/src/meta/metaTable.c
@@ -420,7 +420,8 @@ static int metaAlterTableColumn(SMeta *pMeta, int64_t version, SVAlterTbReq *pAl
   // get table entry
   SDecoder dc = {0};
   tDecoderInit(&dc, pData, nData);
-  metaDecodeEntry(&dc, &entry);
+  ret = metaDecodeEntry(&dc, &entry);
+  ASSERT(ret == 0);
 
   if (entry.type != TSDB_NORMAL_TABLE) {
     terrno = TSDB_CODE_VND_INVALID_TABLE_ACTION;
@@ -468,11 +469,11 @@ static int metaAlterTableColumn(SMeta *pMeta, int64_t version, SVAlterTbReq *pAl
         goto _err;
       }
       pSchema->sver++;
-      pSchema->nCols--;
       tlen = (pSchema->nCols - iCol - 1) * sizeof(SSchema);
       if (tlen) {
         memmove(pColumn, pColumn + 1, tlen);
       }
+      pSchema->nCols--;
       break;
     case TSDB_ALTER_TABLE_UPDATE_COLUMN_BYTES:
       if (pColumn == NULL) {
-- 
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