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

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into  rakia.gmz:/home/kgeorge/mysql/autopush/B25551-5.0-opt


sql/sql_select.cc:
  Auto merged
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unknown
2007-02-01 10:50:41 +02:00
parent c15b2e4152 d01ec5e727
commit 6bddf2a01f
3 changed files with 52 additions and 10 deletions
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26
mysql-test/r/distinct.result
View File

@ -530,7 +530,8 @@ id select_type table type possible_keys key key_len ref rows Extra
EXPLAIN SELECT DISTINCT a,b FROM t1 GROUP BY a,b;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 3
CREATE TABLE t2(a INT, b INT, c INT, d INT, PRIMARY KEY (a,b));
CREATE TABLE t2(a INT, b INT NOT NULL, c INT NOT NULL, d INT,
PRIMARY KEY (a,b));
INSERT INTO t2 VALUES (1,1,1,50), (1,2,3,40), (2,1,3,4);
EXPLAIN SELECT DISTINCT a FROM t2;
id select_type table type possible_keys key key_len ref rows Extra
@ -644,3 +645,26 @@ SELECT COUNT(*) FROM
COUNT(*)
2
DROP TABLE t1, t2;
CREATE TABLE t1 (a INT, UNIQUE (a));
INSERT INTO t1 VALUES (4),(null),(2),(1),(null),(3);
EXPLAIN SELECT DISTINCT a FROM t1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index NULL a 5 NULL 6 Using index
SELECT DISTINCT a FROM t1;
a
NULL
1
2
3
4
EXPLAIN SELECT a FROM t1 GROUP BY a;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index NULL a 5 NULL 6 Using index
SELECT a FROM t1 GROUP BY a;
a
NULL
1
2
3
4
DROP TABLE t1;

17
mysql-test/t/distinct.test
View File

@ -364,7 +364,8 @@ EXPLAIN SELECT a FROM t1 GROUP BY a;
EXPLAIN SELECT a,b FROM t1 GROUP BY a,b;
EXPLAIN SELECT DISTINCT a,b FROM t1 GROUP BY a,b;
CREATE TABLE t2(a INT, b INT, c INT, d INT, PRIMARY KEY (a,b));
CREATE TABLE t2(a INT, b INT NOT NULL, c INT NOT NULL, d INT,
PRIMARY KEY (a,b));
INSERT INTO t2 VALUES (1,1,1,50), (1,2,3,40), (2,1,3,4);
EXPLAIN SELECT DISTINCT a FROM t2;
EXPLAIN SELECT DISTINCT a,a FROM t2;
@ -525,3 +526,17 @@ SELECT COUNT(*) FROM
(SELECT DISTINCT a FROM t2 WHERE a='oe' COLLATE latin1_german2_ci) dt;
DROP TABLE t1, t2;
#
# Bug #25551: inconsistent behaviour in grouping NULL, depending on index type
#
CREATE TABLE t1 (a INT, UNIQUE (a));
INSERT INTO t1 VALUES (4),(null),(2),(1),(null),(3);
EXPLAIN SELECT DISTINCT a FROM t1;
#result must have one row with NULL
SELECT DISTINCT a FROM t1;
EXPLAIN SELECT a FROM t1 GROUP BY a;
#result must have one row with NULL
SELECT a FROM t1 GROUP BY a;
DROP TABLE t1;