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15 lines
436 B
Text
15 lines
436 B
Text
--source include/have_innodb.inc
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#
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# MDEV-4925 Wrong result - count(distinct), Using index for group-by (scanning)
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#
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CREATE TABLE t1 (
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id int NOT NULL AUTO_INCREMENT,
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a int NOT NULL,
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b int NOT NULL,
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PRIMARY KEY (id),
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UNIQUE KEY ba (b, a)
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) ENGINE=InnoDB;
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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);
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SELECT COUNT(DISTINCT b) FROM t1 WHERE a = 1;
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DROP TABLE t1;
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