fixed d0a6bc0 from https://gitee.com/lilongfei15/openGauss-server/pulls/4235

修复创建索引失败导致安全模式没有推出造成无法创建临时表

src/gausskernel/optimizer/commands/indexcmds.cpp

@@ -814,6 +814,7 @@ ObjectAddress DefineIndex(Oid relationId, IndexStmt* stmt, Oid indexRelationId,
             (errcode(ERRCODE_DUPLICATE_TABLE),
                 errmsg("relation \"%s\" already exists, skipping", stmt->idxname)));
         heap_close(rel, NoLock);
+        SetUserIdAndSecContext(root_save_userid, root_save_sec_context);
         return address;
     }