Fix view merge for join on condition containing subq

src/sql/rewrite/ob_transform_view_merge.cpp

@@ -505,6 +505,7 @@ int ObTransformViewMerge::transform_joined_table(
   TableItem* left_table = NULL;
   TableItem* right_table = NULL;
   trans_happened = false;
+  bool cond_contain_subq = false;
   if (OB_ISNULL(stmt) || OB_ISNULL(joined_table) || OB_ISNULL(left_table = joined_table->left_table_) ||
       OB_ISNULL(right_table = joined_table->right_table_)) {
     ret = OB_ERR_UNEXPECTED;
@@ -516,6 +517,10 @@ int ObTransformViewMerge::transform_joined_table(
     LOG_WARN("too deep recursive", K(ret));
   } else if (joined_table->joined_type_ == CONNECT_BY_JOIN) {
     // do nothing
+  } else if (OB_FAIL(check_outerjoin_condition_contain_subq(joined_table, cond_contain_subq))) {
+    LOG_WARN("failed to check outer join condition contain subq", K(ret));
+  } else if (cond_contain_subq) {
+    // do nothing
   } else {
     bool can_push_where = true;
     bool need_check_where_condi = false;
@@ -912,5 +917,26 @@ int ObTransformViewMerge::adjust_stmt_semi_infos(ObDMLStmt* parent_stmt, ObSelec
   return ret;
 }
 
+int ObTransformViewMerge::check_outerjoin_condition_contain_subq(JoinedTable* joined_table,
+                                                                 bool &contains_subq)
+{
+  int ret = OB_SUCCESS;
+  contains_subq = false;
+  if (joined_table->joined_type_ == FULL_OUTER_JOIN ||
+      joined_table->joined_type_ == LEFT_OUTER_JOIN ||
+      joined_table->joined_type_ == RIGHT_OUTER_JOIN) {
+    for (int64_t i = 0; OB_SUCC(ret) && !contains_subq && i < joined_table->get_join_conditions().count(); ++i) {
+      ObRawExpr* expr = joined_table->get_join_conditions().at(i);
+      if (OB_ISNULL(expr)) {
+        ret = OB_ERR_UNEXPECTED;
+        LOG_WARN("invalid condition expr", K(ret));
+      } else if (expr->has_flag(CNT_SUB_QUERY)) {
+        contains_subq = true;
+      }
+    }
+  }
+  return ret;
+}
+
 }  // namespace sql
 }  // namespace oceanbase

src/sql/rewrite/ob_transform_view_merge.h

@@ -100,6 +100,8 @@ private:
   int transform_generated_table(ObDMLStmt* parent_stmt, TableItem* table_item, bool& trans_happened);
   int transform_in_from_item(ObDMLStmt* stmt, bool& trans_happened);
   int transform_in_semi_info(ObDMLStmt* stmt, bool& trans_happened);
+
+  int check_outerjoin_condition_contain_subq(JoinedTable* joined_table, bool &contains_subq);
   bool for_post_process_;
   DISALLOW_COPY_AND_ASSIGN(ObTransformViewMerge);
 };