EVOLUTION-MANAGER

Edit File: innodb_bug57252.test

--source include/have_innodb.inc
#
# Bug#57252 disabling innobase_stats_on_metadata disables ANALYZE
# http://bugs.mysql.com/57252
#

-- disable_query_log
-- disable_result_log

SET @innodb_stats_on_metadata_orig = @@innodb_stats_on_metadata;

CREATE TABLE bug57252 (a INT, KEY akey (a)) ENGINE=INNODB;

BEGIN;
let $i = 10;
while ($i) {
	eval INSERT INTO bug57252 VALUES ($i);
	dec $i;
}
COMMIT;

-- enable_result_log

SET GLOBAL innodb_stats_on_metadata=0;

# this calls ::info() without HA_STATUS_CONST and so
# index->stat_n_diff_key_vals[] is not copied to the mysql-visible
# rec_per_key
SELECT cardinality FROM information_schema.statistics
WHERE table_name='bug57252' AND index_name='akey';

# this calls ::info() with HA_STATUS_CONST and so
# index->stat_n_diff_key_vals[] is copied to the mysql-visible
# rec_per_key at the end; when the bug is present dict_update_statistics()
# is not called beforehand and so index->stat_n_diff_key_vals[] contains
# an outdated data and thus we get an outdated data in the result when the
# bug is present
ANALYZE TABLE bug57252;

SELECT cardinality FROM information_schema.statistics
WHERE table_name='bug57252' AND index_name='akey';

DROP TABLE bug57252;

SET GLOBAL innodb_stats_on_metadata = @innodb_stats_on_metadata_orig;