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Merge gkodinov@bk-internal.mysql.com:/home/bk/mysql-5.0-opt

Browse source 
into  magare.gmz:/home/kgeorge/mysql/autopush/B27786-5.0-opt
This commit is contained in:
gkodinov/kgeorge@magare.gmz 2007-04-20 12:01:54 +03:00
commit bcde01f6ff
4 changed files with 66 additions and 2 deletions
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35
mysql-test/r/view.result
View file

@ -3319,4 +3319,39 @@ lgid clid
2 YES
DROP VIEW v1;
DROP table t1,t2;
CREATE TABLE t1 (a INT);
INSERT INTO t1 VALUES (1),(2),(3);
CREATE VIEW v1 AS SELECT a FROM t1 ORDER BY a;
SELECT * FROM t1 UNION SELECT * FROM v1;
a
1
2
3
EXPLAIN SELECT * FROM t1 UNION SELECT * FROM v1;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 3
2 UNION t1 ALL NULL NULL NULL NULL 3
NULL UNION RESULT <union1,2> ALL NULL NULL NULL NULL NULL
SELECT * FROM v1 UNION SELECT * FROM t1;
a
1
2
3
EXPLAIN SELECT * FROM v1 UNION SELECT * FROM t1;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 3
2 UNION t1 ALL NULL NULL NULL NULL 3
NULL UNION RESULT <union1,2> ALL NULL NULL NULL NULL NULL
SELECT * FROM t1 UNION SELECT * FROM v1 ORDER BY a;
a
1
2
3
EXPLAIN SELECT * FROM t1 UNION SELECT * FROM v1 ORDER BY a;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 3
2 UNION t1 ALL NULL NULL NULL NULL 3
NULL UNION RESULT <union1,2> ALL NULL NULL NULL NULL NULL Using filesort
DROP VIEW v1;
DROP TABLE t1;
End of 5.0 tests.

16
mysql-test/t/view.test
View file

@ -3205,4 +3205,20 @@ SELECT * FROM v1;
DROP VIEW v1;
DROP table t1,t2;
#
# Bug#27786: Inconsistent Operation Performing UNION On View With ORDER BY
#
CREATE TABLE t1 (a INT); INSERT INTO t1 VALUES (1),(2),(3);
CREATE VIEW v1 AS SELECT a FROM t1 ORDER BY a;
SELECT * FROM t1 UNION SELECT * FROM v1;
EXPLAIN SELECT * FROM t1 UNION SELECT * FROM v1;
SELECT * FROM v1 UNION SELECT * FROM t1;
EXPLAIN SELECT * FROM v1 UNION SELECT * FROM t1;
SELECT * FROM t1 UNION SELECT * FROM v1 ORDER BY a;
EXPLAIN SELECT * FROM t1 UNION SELECT * FROM v1 ORDER BY a;
DROP VIEW v1;
DROP TABLE t1;
--echo End of 5.0 tests.

8
sql/sql_lex.h
View file

@ -468,6 +468,7 @@ public:
bool change_result(select_subselect *result, select_subselect *old_result);
void set_limit(st_select_lex *values);
void set_thd(THD *thd_arg) { thd= thd_arg; }
inline bool is_union ();
friend void lex_start(THD *thd, uchar *buf, uint length);
friend int subselect_union_engine::exec();
@ -700,6 +701,13 @@ public:
};
typedef class st_select_lex SELECT_LEX;
inline bool st_select_lex_unit::is_union ()
{
return first_select()->next_select() &&
first_select()->next_select()->linkage == UNION_TYPE;
}
#define ALTER_ADD_COLUMN 1
#define ALTER_DROP_COLUMN 2
#define ALTER_CHANGE_COLUMN 4

9
sql/sql_view.cc
View file

@ -1263,13 +1263,18 @@ bool mysql_make_view(THD *thd, File_parser *parser, TABLE_LIST *table,
unit->slave= save_slave; // fix include_down initialisation
}
/*
We can safely ignore the VIEW's ORDER BY if we merge into union
branch, as order is not important there.
*/
if (!table->select_lex->master_unit()->is_union())
table->select_lex->order_list.push_back(&lex->select_lex.order_list);
/*
This SELECT_LEX will be linked in global SELECT_LEX list
to make it processed by mysql_handle_derived(),
but it will not be included to SELECT_LEX tree, because it
will not be executed
*/
table->select_lex->order_list.push_back(&lex->select_lex.order_list);
*/
goto ok;
}