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MDEV-13683: crash in Item_window_func::update_used_tables

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Window definitions are resolved during fix fields. Updating used tables
for window functions must be done after all window functions have had a
chance to be resolved.

There was an additional problem with the implementation: expressions that
contained window functions never updated the expression's used tables.
To fix both these issues, make sure to call "update_used_tables" on all
items that contain window functions after we have passed through all
items.
This commit is contained in:
Vicențiu Ciorbaru
2017-12-28 19:29:40 +02:00
parent 8e9d8ffd1a
commit 6c4cf79d94
2 changed files with 16 additions and 7 deletions
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16
sql/sql_select.cc
View File

@@ -859,6 +859,22 @@ JOIN::prepare(TABLE_LIST *tables_init,
}
}
/*
After setting up window functions, we may have discovered additional
used tables from the PARTITION BY and ORDER BY list. Update all items
that contain window functions.
*/
if (select_lex->have_window_funcs())
{
List_iterator_fast<Item> it(select_lex->item_list);
Item *item;
while ((item= it++))
{
if (item->with_window_func)
item->update_used_tables();
}
}
With_clause *with_clause=select_lex->get_with_clause();
if (with_clause && with_clause->prepare_unreferenced_elements(thd))
DBUG_RETURN(1);

7
sql/sql_window.cc
View File

@@ -297,13 +297,6 @@ setup_windows(THD *thd, Ref_ptr_array ref_pointer_array, TABLE_LIST *tables,
}
}
List_iterator_fast<Item_window_func> li(win_funcs);
Item_window_func *win_func_item;
while ((win_func_item= li++))
{
win_func_item->update_used_tables();
}
DBUG_RETURN(0);
}