diff --git a/src/sql/resolver/expr/ob_raw_expr.cpp b/src/sql/resolver/expr/ob_raw_expr.cpp
index 051021516f..ed17fd7862 100644
--- a/src/sql/resolver/expr/ob_raw_expr.cpp
+++ b/src/sql/resolver/expr/ob_raw_expr.cpp
@@ -1378,7 +1378,8 @@ bool ObQueryRefRawExpr::inner_same_as(
       // very tricky, check the definition of ref_stmt_ and get_ref_stmt()
       bool_ret = (get_ref_id() == u_expr.get_ref_id() &&
                   ref_stmt_ == u_expr.ref_stmt_ &&
-                  is_multiset_ == is_multiset_);
+                  is_set_ == u_expr.is_set_ &&
+                  is_multiset_ == u_expr.is_multiset_);
     }
   }
   return bool_ret;
@@ -1388,7 +1389,9 @@ bool ObExprEqualCheckContext::compare_query(const ObQueryRefRawExpr &left,
                                             const ObQueryRefRawExpr &right)
 {
   return left.get_ref_id() == right.get_ref_id() &&
-      left.get_ref_stmt() == right.get_ref_stmt();
+      left.get_ref_stmt() == right.get_ref_stmt() &&
+      left.is_set() == right.is_set() &&
+      left.is_multiset() == right.is_multiset();
 }
 
 int ObQueryRefRawExpr::do_visit(ObRawExprVisitor &visitor)
diff --git a/src/sql/rewrite/ob_stmt_comparer.cpp b/src/sql/rewrite/ob_stmt_comparer.cpp
index 6dadf17606..b131584ff4 100644
--- a/src/sql/rewrite/ob_stmt_comparer.cpp
+++ b/src/sql/rewrite/ob_stmt_comparer.cpp
@@ -245,6 +245,8 @@ bool ObStmtCompareContext::compare_query(const ObQueryRefRawExpr &first,
   QueryRelation relation = QueryRelation::QUERY_UNCOMPARABLE;
   if (&first == &second) {
     bret = true;
+  } else if (first.is_set() != second.is_set() || first.is_multiset() != second.is_multiset()) {
+    bret = false;
   } else if (OB_FAIL(ObStmtComparer::check_stmt_containment(first.get_ref_stmt(),
                                                             second.get_ref_stmt(),
                                                             stmt_map_info,
diff --git a/src/sql/rewrite/ob_transform_simplify_subquery.cpp b/src/sql/rewrite/ob_transform_simplify_subquery.cpp
index 178c24a34b..cacb43ca07 100644
--- a/src/sql/rewrite/ob_transform_simplify_subquery.cpp
+++ b/src/sql/rewrite/ob_transform_simplify_subquery.cpp
@@ -1677,6 +1677,10 @@ int ObTransformSimplifySubquery::eliminate_groupby_distinct_in_any_all(ObRawExpr
     ret = OB_INVALID_ARGUMENT;
     LOG_WARN("get unexpected null", K(ret), K(expr));
   } else if (!expr->has_flag(IS_WITH_ALL) && !expr->has_flag(IS_WITH_ANY)) {
+  } else if (OB_UNLIKELY(2 != expr->get_param_count())
+             || OB_UNLIKELY(!expr->get_param_expr(1)->is_query_ref_expr())) {
+    ret = OB_ERR_UNEXPECTED;
+    LOG_WARN("get unexpected expr", K(ret), KPC(expr));
   } else if (OB_ISNULL(subq_expr = static_cast<ObQueryRefRawExpr *>(expr->get_param_expr(1))) ||
              OB_ISNULL(static_cast<ObRawExpr *>(expr->get_param_expr(0)))) {
     ret = OB_INVALID_ARGUMENT;