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Merge rurik.mysql.com:/home/igor/dev/mysql-5.0-0

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into  rurik.mysql.com:/home/igor/dev/mysql-5.1-0
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igor@rurik.mysql.com
2006-01-06 23:26:20 -08:00
parent a4d7edbb0f d2cfad167b
commit aade22bad2
3 changed files with 58 additions and 5 deletions
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29
mysql-test/r/view.result
View File

@ -2475,3 +2475,32 @@ alias1 alias2
5 5 5 5
drop view v2, v1; drop view v2, v1;
drop table t1; drop table t1;
CREATE TABLE t1 (a int PRIMARY KEY, b int);
INSERT INTO t1 VALUES (2,20), (3,10), (1,10), (0,30), (5,10);
CREATE VIEW v1 AS SELECT * FROM t1;
SELECT MAX(a) FROM t1;
MAX(a)
5
SELECT MAX(a) FROM v1;
MAX(a)
5
EXPLAIN SELECT MAX(a) FROM t1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
EXPLAIN SELECT MAX(a) FROM v1;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
SELECT MIN(a) FROM t1;
MIN(a)
0
SELECT MIN(a) FROM v1;
MIN(a)
0
EXPLAIN SELECT MIN(a) FROM t1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
EXPLAIN SELECT MIN(a) FROM v1;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
DROP VIEW v1;
DROP TABLE t1;

24
mysql-test/t/view.test
View File

@ -2343,3 +2343,27 @@ order by v2.receipt_id;
drop view v2, v1; drop view v2, v1;
drop table t1; drop table t1;
#
# Bug#16016: MIN/MAX optimization for views
#
CREATE TABLE t1 (a int PRIMARY KEY, b int);
INSERT INTO t1 VALUES (2,20), (3,10), (1,10), (0,30), (5,10);
CREATE VIEW v1 AS SELECT * FROM t1;
SELECT MAX(a) FROM t1;
SELECT MAX(a) FROM v1;
EXPLAIN SELECT MAX(a) FROM t1;
EXPLAIN SELECT MAX(a) FROM v1;
SELECT MIN(a) FROM t1;
SELECT MIN(a) FROM v1;
EXPLAIN SELECT MIN(a) FROM t1;
EXPLAIN SELECT MIN(a) FROM v1;
DROP VIEW v1;
DROP TABLE t1;

8
sql/opt_sum.cc
View File

@ -180,14 +180,14 @@ int opt_sum_query(TABLE_LIST *tables, List<Item> &all_fields,COND *conds)
indexes to find the key. indexes to find the key.
*/ */
Item *expr=item_sum->args[0]; Item *expr=item_sum->args[0];
if (expr->type() == Item::FIELD_ITEM) if (expr->real_item()->type() == Item::FIELD_ITEM)
{ {
byte key_buff[MAX_KEY_LENGTH]; byte key_buff[MAX_KEY_LENGTH];
TABLE_REF ref; TABLE_REF ref;
uint range_fl, prefix_len; uint range_fl, prefix_len;
ref.key_buff= key_buff; ref.key_buff= key_buff;
Item_field *item_field= ((Item_field*) expr); Item_field *item_field= (Item_field*) (expr->real_item());
TABLE *table= item_field->field->table; TABLE *table= item_field->field->table;
/* /*
@ -267,14 +267,14 @@ int opt_sum_query(TABLE_LIST *tables, List<Item> &all_fields,COND *conds)
indexes to find the key. indexes to find the key.
*/ */
Item *expr=item_sum->args[0]; Item *expr=item_sum->args[0];
if (expr->type() == Item::FIELD_ITEM) if (expr->real_item()->type() == Item::FIELD_ITEM)
{ {
byte key_buff[MAX_KEY_LENGTH]; byte key_buff[MAX_KEY_LENGTH];
TABLE_REF ref; TABLE_REF ref;
uint range_fl, prefix_len; uint range_fl, prefix_len;
ref.key_buff= key_buff; ref.key_buff= key_buff;
Item_field *item_field= ((Item_field*) expr); Item_field *item_field= (Item_field*) (expr->real_item());
TABLE *table= item_field->field->table; TABLE *table= item_field->field->table;
/* /*