MDEV-29363 Add with_subquery_processor

sql/item.h

@@ -2208,6 +2208,11 @@ class Item :public Value_source,
   virtual bool view_used_tables_processor(void *arg) { return 0; }
   virtual bool eval_not_null_tables(void *arg) { return 0; }
   virtual bool is_subquery_processor(void *arg) { return 0; }
+  virtual bool with_subquery_processor(void *arg)
+  {
+    with_flags= with_flags & ~item_with_t::SUBQUERY;
+    return 0;
+  }
   virtual bool count_sargable_conds(void *arg) { return 0; }
   virtual bool limit_index_condition_pushdown_processor(void *arg) { return 0; }
   virtual bool exists2in_processor(void *arg) { return 0; }
@@ -5484,6 +5489,19 @@ class Item_func_or_sum: public Item_result_field,
       return true;
     return (this->*processor)(arg);
   }
+  bool with_subquery_processor (void *opt_arg) override
+  {
+    for (uint i= 0; i < arg_count; i++)
+    {
+      if (args[i]->with_subquery())
+      {
+        with_flags|= item_with_t::SUBQUERY;
+        return FALSE;
+      }
+    }
+    with_flags&= ~item_with_t::SUBQUERY;
+    return FALSE;
+  }
   /*
     Built-in schema, e.g. mariadb_schema, oracle_schema, maxdb_schema
   */

sql/item_subselect.h

@@ -265,6 +265,11 @@ class Item_subselect :public Item_result_field,
   bool expr_cache_is_needed(THD *) override;
   void get_cache_parameters(List<Item> &parameters) override;
   bool is_subquery_processor (void *opt_arg) override { return 1; }
+  bool with_subquery_processor (void *opt_arg) override
+  {
+    with_flags|= item_with_t::SUBQUERY;
+    return FALSE;
+  }
   bool exists2in_processor(void *opt_arg) override { return 0; }
   bool limit_index_condition_pushdown_processor(void *opt_arg) override
   {

sql/sql_select.cc

@@ -17992,6 +17992,7 @@ static COND *build_equal_items(JOIN *join, COND *cond,
   {
     cond= cond->build_equal_items(thd, inherited, link_equal_fields,
                                   cond_equal_ref);
+    cond->walk(&Item::with_subquery_processor, 1, 0);
     if (*cond_equal_ref)
     {
       (*cond_equal_ref)->upper_levels= inherited;