From 269a7cead62f13caf90fd92f60f16f3b7c33641f Mon Sep 17 00:00:00 2001
From: shenglian zhou <slzhou@taosdata.com>
Date: Fri, 23 Jul 2021 15:50:53 +0800
Subject: [PATCH] fix error when modifing tag column causing exceed limit

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

diff --git a/src/client/src/tscSQLParser.c b/src/client/src/tscSQLParser.c
index c0627f4c31..5bd981d379 100644
--- a/src/client/src/tscSQLParser.c
+++ b/src/client/src/tscSQLParser.c
@@ -6073,7 +6073,7 @@ int32_t setAlterTableInfo(SSqlObj* pSql, struct SSqlInfo* pInfo) {
     for (i = 0; i < numOfColumns; ++i) {
       nLen += pSchema[i].colId != columnIndex.columnIndex ? pSchema[i].bytes : pItem->bytes;
     }
-    if (nLen >= TSDB_MAX_BYTES_PER_ROW) {
+    if (nLen >= TSDB_MAX_TAGS_LEN) {
       return invalidOperationMsg(pMsg, msg24);
     }
 
-- 
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