more fix

source/dnode/vnode/src/meta/metaTable.c

@@ -731,7 +731,7 @@ static int metaAlterTableColumn(SMeta *pMeta, int64_t version, SVAlterTbReq *pAl
   SSchemaWrapper *pSchema;
   int             c;
 
-  if (pAlterTbReq->colName == NULL || pAlterTbReq->colNewName == NULL) {
+  if (pAlterTbReq->colName == NULL) {
     terrno = TSDB_CODE_INVALID_MSG;
     return -1;
   }
@@ -853,6 +853,10 @@ static int metaAlterTableColumn(SMeta *pMeta, int64_t version, SVAlterTbReq *pAl
       pColumn->bytes = pAlterTbReq->colModBytes;
       break;
     case TSDB_ALTER_TABLE_UPDATE_COLUMN_NAME:
+      if (pAlterTbReq->colNewName == NULL) {
+        terrno = TSDB_CODE_INVALID_MSG;
+        goto _err;
+      }
       if (pColumn == NULL) {
         terrno = TSDB_CODE_VND_TABLE_COL_NOT_EXISTS;
         goto _err;