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Merge branch '10.0' into 10.1

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Vicențiu Ciorbaru
2018-06-12 18:55:27 +03:00
parent 7bbe324fc1 170bec36c0
commit aa59ecec89
78 changed files with 653 additions and 218 deletions
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18
mysql-test/t/selectivity.test
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@ -1045,6 +1045,24 @@ SELECT * FROM (SELECT t FROM t1 WHERE d IS NULL) sq;
DROP TABLE t1;
--echo #
--echo # MDEV-16374: filtered shows 0 for materilization scan for a semi join, which makes optimizer
--echo # always pick materialization scan over materialization lookup
--echo #
create table t0(a int);
insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
create table t1 (a int, b int);
insert into t1 values (0,0),(1,1),(2,2),(3,3),(4,4),(5,5),(6,6),(7,7),(8,8),(9,9),(10,10),
(11,11),(12,12),(13,13),(14,14),(15,15);
set @@optimizer_use_condition_selectivity=2;
explain extended select * from t1 where a in (select max(a) from t1 group by b);
select * from t1 where a in (select max(a) from t1 group by b);
set @@optimizer_use_condition_selectivity=1;
explain extended select * from t1 where a in (select max(a) from t1 group by b);
select * from t1 where a in (select max(a) from t1 group by b);
drop table t1,t0;
set histogram_size=@save_histogram_size;
set optimizer_use_condition_selectivity=@save_optimizer_use_condition_selectivity;
set use_stat_tables=@save_use_stat_tables;