diff options
Diffstat (limited to 'sql/item_row.h')
| -rw-r--r-- | sql/item_row.h | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/sql/item_row.h b/sql/item_row.h index bbb9a7f1f96..153a6f085b3 100644 --- a/sql/item_row.h +++ b/sql/item_row.h @@ -2,7 +2,7 @@ #define ITEM_ROW_INCLUDED /* - Copyright (c) 2002, 2010, Oracle and/or its affiliates. + Copyright (c) 2002, 2013, Oracle and/or its affiliates. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by @@ -28,11 +28,20 @@ @endverbatim */ + +/** + Item which stores (x,y,...) and ROW(x,y,...). + Note that this can be recursive: ((x,y),(z,t)) is a ROW of ROWs. +*/ class Item_row: public Item, private Item_args, private Used_tables_and_const_cache { table_map not_null_tables_cache; + /** + If elements are made only of constants, of which one or more are + NULL. For example, this item is (1,2,NULL), or ( (1,NULL), (2,3) ). + */ bool with_null; public: Item_row(THD *thd, List<Item> &list): |