From d5813a06f67d6478fed95aa9d10c44e1c1eb1076 Mon Sep 17 00:00:00 2001 From: unknown Date: Fri, 16 Feb 2007 19:39:28 +0300 Subject: [PATCH] Bug#16630: The update fields of the INSERT .. SELECT .. ON DUPLICATE KEY UPDATE contains wrong data if the SELECT employs a temporary table. If the UPDATE values of the INSERT .. SELECT .. ON DUPLICATE KEY UPDATE statement contains fields from the SELECT part and the select employs a temporary table then those fields will contain wrong values because they aren't corrected to get data from the temporary table. The solution is to add these fields to the selects all_fields list, to store pointers to those fields in the selects ref_pointer_array and to access them via Item_ref objects. The substitution for Item_ref objects is done in the new function called Item_field::update_value_transformer(). It is called through the item->transform() mechanism at the end of the select_insert::prepare() function. sql/item.cc: Bug#16630: The update fields of the INSERT .. SELECT .. ON DUPLICATE KEY UPDATE contains wrong data if the SELECT employs a temporary table. The new method Item_field::update_value_transformer() is added. It substitutes fields in the update values list for references (Item_ref objects) to them. sql/item.h: Bug#16630: The update fields of the INSERT .. SELECT .. ON DUPLICATE KEY UPDATE contains wrong data if the SELECT employs a temporary table. The update_value_transformer() method is added to the Item and to the Item_field classes. sql/sql_insert.cc: Bug#16630: The update fields of the INSERT .. SELECT .. ON DUPLICATE KEY UPDATE contains wrong data if the SELECT employs a temporary table. Traverse update values and substitute fields from the select for references (Item_ref objects) to them. sql/sql_select.cc: Bug#16630: The update fields of the INSERT .. SELECT .. ON DUPLICATE KEY UPDATE contains wrong data if the SELECT employs a temporary table. Traverse update values and substitute fields from the select for references (Item_ref objects) to them. mysql-test/r/insert_select.result: Added a test case for bug#16630: The update fields of the INSERT .. SELECT .. ON DUPLICATE KEY UPDATE contains wrong data if the SELECT employs a temporary table. mysql-test/t/insert_select.test: Added a test case for bug#16630: The update fields of the INSERT .. SELECT .. ON DUPLICATE KEY UPDATE contains wrong data if the SELECT employs a temporary table. --- mysql-test/r/insert_select.result | 13 +++++++++ mysql-test/t/insert_select.test | 15 +++++++++++ sql/item.cc | 45 +++++++++++++++++++++++++++++++ sql/item.h | 2 ++ sql/sql_insert.cc | 16 +++++++++++ sql/sql_select.cc | 6 ++--- 6 files changed, 94 insertions(+), 3 deletions(-) diff --git a/mysql-test/r/insert_select.result b/mysql-test/r/insert_select.result index 2e0acf303c2..92b3ea0e42b 100644 --- a/mysql-test/r/insert_select.result +++ b/mysql-test/r/insert_select.result @@ -731,3 +731,16 @@ select @@identity; @@identity 0 drop table t1; +CREATE TABLE t1 (f1 INT, f2 INT ); +CREATE TABLE t2 (f1 INT PRIMARY KEY, f2 INT); +INSERT INTO t1 VALUES (1,1),(2,2),(10,10); +INSERT INTO t2 (f1, f2) SELECT f1, f2 FROM t1; +INSERT INTO t2 (f1, f2) +SELECT f1, f1 FROM t2 src WHERE f1 < 2 +ON DUPLICATE KEY UPDATE f1 = 100 + src.f1; +SELECT * FROM t2; +f1 f2 +101 1 +2 2 +10 10 +DROP TABLE t1, t2; diff --git a/mysql-test/t/insert_select.test b/mysql-test/t/insert_select.test index 5c60fc8e1f0..31508b3d6c4 100644 --- a/mysql-test/t/insert_select.test +++ b/mysql-test/t/insert_select.test @@ -292,3 +292,18 @@ select @@identity; insert ignore t1(f2) select 1; select @@identity; drop table t1; + +# +# Bug#16630: wrong result, when INSERT t1 SELECT ... FROM t1 ON DUPLICATE +# +CREATE TABLE t1 (f1 INT, f2 INT ); +CREATE TABLE t2 (f1 INT PRIMARY KEY, f2 INT); +INSERT INTO t1 VALUES (1,1),(2,2),(10,10); +INSERT INTO t2 (f1, f2) SELECT f1, f2 FROM t1; +INSERT INTO t2 (f1, f2) + SELECT f1, f1 FROM t2 src WHERE f1 < 2 + ON DUPLICATE KEY UPDATE f1 = 100 + src.f1; +SELECT * FROM t2; +DROP TABLE t1, t2; + + diff --git a/sql/item.cc b/sql/item.cc index 95001809e9a..23193e0990c 100644 --- a/sql/item.cc +++ b/sql/item.cc @@ -4809,6 +4809,51 @@ void Item_field::update_null_value() } +/* + Add the field to the select list and substitute it for the reference to + the field. + + SYNOPSIS + Item_field::update_value_transformer() + select_arg current select + + DESCRIPTION + If the field doesn't belong to the table being inserted into then it is + added to the select list, pointer to it is stored in the ref_pointer_array + of the select and the field itself is substituted for the Item_ref object. + This is done in order to get correct values from update fields that + belongs to the SELECT part in the INSERT .. SELECT .. ON DUPLICATE KEY + UPDATE statement. + + RETURN + 0 if error occured + ref if all conditions are met + this field otherwise +*/ + +Item *Item_field::update_value_transformer(byte *select_arg) +{ + SELECT_LEX *select= (SELECT_LEX*)select_arg; + DBUG_ASSERT(fixed); + + if (field->table != select->context.table_list->table && + type() != Item::TRIGGER_FIELD_ITEM) + { + List *all_fields= &select->join->all_fields; + Item **ref_pointer_array= select->ref_pointer_array; + int el= all_fields->elements; + Item_ref *ref; + + ref_pointer_array[el]= (Item*)this; + all_fields->push_front((Item*)this); + ref= new Item_ref(&select->context, ref_pointer_array + el, + table_name, field_name); + return ref; + } + return this; +} + + Item_ref::Item_ref(Name_resolution_context *context_arg, Item **item, const char *table_name_arg, const char *field_name_arg) diff --git a/sql/item.h b/sql/item.h index 6c41aa09f80..c254578f780 100644 --- a/sql/item.h +++ b/sql/item.h @@ -817,6 +817,7 @@ public: virtual Item_field *filed_for_view_update() { return 0; } virtual Item *neg_transformer(THD *thd) { return NULL; } + virtual Item *update_value_transformer(byte *select_arg) { return this; } virtual Item *safe_charset_converter(CHARSET_INFO *tocs); void delete_self() { @@ -1295,6 +1296,7 @@ public: Item_field *filed_for_view_update() { return this; } Item *safe_charset_converter(CHARSET_INFO *tocs); int fix_outer_field(THD *thd, Field **field, Item **reference); + virtual Item *update_value_transformer(byte *select_arg); friend class Item_default_value; friend class Item_insert_value; friend class st_select_lex_unit; diff --git a/sql/sql_insert.cc b/sql/sql_insert.cc index 39d7f8e9b58..542f47294e5 100644 --- a/sql/sql_insert.cc +++ b/sql/sql_insert.cc @@ -2388,7 +2388,23 @@ select_insert::prepare(List &values, SELECT_LEX_UNIT *u) next_name_resolution_table= ctx_state.save_next_local; } res= res || setup_fields(thd, 0, *info.update_values, 1, 0, 0); + if (!res) + { + /* + Traverse the update values list and substitute fields from the + select for references (Item_ref objects) to them. This is done in + order to get correct values from those fields when the select + employs a temporary table. + */ + List_iterator li(*info.update_values); + Item *item; + while ((item= li++)) + { + item->transform(&Item::update_value_transformer, + (byte*)lex->current_select); + } + } /* Restore the current context. */ ctx_state.restore_state(context, table_list); } diff --git a/sql/sql_select.cc b/sql/sql_select.cc index 05ee0d77c1f..f4fec36aa53 100644 --- a/sql/sql_select.cc +++ b/sql/sql_select.cc @@ -482,6 +482,9 @@ JOIN::prepare(Item ***rref_pointer_array, } } + if (!procedure && result && result->prepare(fields_list, unit_arg)) + goto err; /* purecov: inspected */ + /* Init join struct */ count_field_types(&tmp_table_param, all_fields, 0); ref_pointer_array_size= all_fields.elements*sizeof(Item*); @@ -495,9 +498,6 @@ JOIN::prepare(Item ***rref_pointer_array, goto err; } #endif - if (!procedure && result && result->prepare(fields_list, unit_arg)) - goto err; /* purecov: inspected */ - if (select_lex->olap == ROLLUP_TYPE && rollup_init()) goto err; if (alloc_func_list())