diff --git a/src/sql/resolver/dml/ob_select_resolver.cpp b/src/sql/resolver/dml/ob_select_resolver.cpp
index 89a7ef85f..e0e8ebf9d 100644
--- a/src/sql/resolver/dml/ob_select_resolver.cpp
+++ b/src/sql/resolver/dml/ob_select_resolver.cpp
@@ -1069,7 +1069,9 @@ int ObSelectResolver::resolve_normal_query(const ParseNode &parse_tree)
   OZ( resolve_with_clause(parse_tree.children_[PARSE_SELECT_WITH]) );
 
   /* normal select */
-  select_stmt->assign_set_op(ObSelectStmt::NONE);
+  if (OB_SUCC(ret)) {
+    select_stmt->assign_set_op(ObSelectStmt::NONE);
+  }
   OZ( resolve_query_options(parse_tree.children_[PARSE_SELECT_DISTINCT]) );
   if (OB_SUCC(ret) && is_only_full_group_by_on(session_info_->get_sql_mode())) {
     OZ( standard_group_checker_.init() );
diff --git a/src/sql/resolver/ob_stmt.h b/src/sql/resolver/ob_stmt.h
index f091be41a..5aae91392 100644
--- a/src/sql/resolver/ob_stmt.h
+++ b/src/sql/resolver/ob_stmt.h
@@ -623,6 +623,8 @@ public:
         stmt = NULL;
       } else if (OB_FAIL(stmt->init_stmt(table_hash_allocator_, wrapper_allocator_))) {
         SQL_RESV_LOG(WARN, "failed to init tables hash", K(ret));
+        stmt->~StmtType();
+        stmt = NULL;
       }
     }
     return ret;