diff options
Diffstat (limited to 'sql/item_subselect.h')
| -rw-r--r-- | sql/item_subselect.h | 17 |
1 files changed, 15 insertions, 2 deletions
diff --git a/sql/item_subselect.h b/sql/item_subselect.h index 65b415b44e9..775e4b4b317 100644 --- a/sql/item_subselect.h +++ b/sql/item_subselect.h @@ -1,5 +1,5 @@ /* - Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved. + Copyright (c) 2002, 2010, 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 @@ -54,8 +54,16 @@ protected: bool have_to_be_excluded; /* cache of constant state */ bool const_item_cache; - + public: + /* + References from inside the subquery to the select that this predicate is + in. References to parent selects not included. + */ + List<Item> refers_to; + int in_fix_fields; + bool eliminated; + /* changed engine indicator */ bool engine_changed; /* subquery is transformed */ @@ -84,6 +92,7 @@ public: void cleanup(); virtual void reset() { + eliminated= FALSE; null_value= 1; } virtual trans_res select_transformer(JOIN *join); @@ -128,6 +137,8 @@ public: virtual void reset_value_registration() {} enum_parsing_place place() { return parsing_place; } bool walk(Item_processor processor, bool walk_subquery, uchar *arg); + bool mark_as_eliminated_processor(uchar *arg); + bool enumerate_field_refs_processor(uchar *arg); /** Get the SELECT_LEX structure associated with this Item. @@ -227,6 +238,7 @@ public: subs_type substype() { return EXISTS_SUBS; } void reset() { + eliminated= FALSE; value= 0; } @@ -298,6 +310,7 @@ public: subs_type substype() { return IN_SUBS; } void reset() { + eliminated= FALSE; value= 0; null_value= 0; was_null= 0; |