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MDEV-4925 Wrong result - count(distinct), Using index for group-by (scanning)

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added the test case
This commit is contained in:
Sergei Golubchik
2014-05-12 12:56:13 +02:00
parent 124428a9e2
commit f6524e4963
2 changed files with 27 additions and 0 deletions
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12
mysql-test/suite/innodb/r/count_distinct.result Normal file
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CREATE TABLE t1 (
id int NOT NULL AUTO_INCREMENT,
a int NOT NULL,
b int NOT NULL,
PRIMARY KEY (id),
UNIQUE KEY ba (b, a)
) ENGINE=InnoDB;
INSERT INTO t1 (a, b) VALUES(1,101),(1,102),(1,103),(1,104),(1,105),(1,106),(1,107),(1,108),(1,109),(1,110);
SELECT COUNT(DISTINCT b) FROM t1 WHERE a = 1;
COUNT(DISTINCT b)
10
DROP TABLE t1;

15
mysql-test/suite/innodb/t/count_distinct.test Normal file
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--source include/have_innodb.inc
#
# MDEV-4925 Wrong result - count(distinct), Using index for group-by (scanning)
#
CREATE TABLE t1 (
id int NOT NULL AUTO_INCREMENT,
a int NOT NULL,
b int NOT NULL,
PRIMARY KEY (id),
UNIQUE KEY ba (b, a)
) ENGINE=InnoDB;
INSERT INTO t1 (a, b) VALUES(1,101),(1,102),(1,103),(1,104),(1,105),(1,106),(1,107),(1,108),(1,109),(1,110);
SELECT COUNT(DISTINCT b) FROM t1 WHERE a = 1;
DROP TABLE t1;