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MDEV-22191: Range access is not picked when index_merge_sort_union is turned off

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When index_merge_sort_union is turned off only ror scans were considered for range
scans, which is wrong.
To fix the problem ensure both ror scans and non ror scans are considered for range
access
This commit is contained in:
Varun Gupta
2020-04-08 17:39:27 +05:30
parent 64b70b09e6
commit c1394ab6b5
4 changed files with 62 additions and 6 deletions
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14
mysql-test/t/range.test
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@ -1718,3 +1718,17 @@ where (key1varchar='value1' AND (key2int <=1 OR key2int > 1));
--echo # The following must show col1=12345 for all rows:
select * from t1;
drop table t1;
--echo #
--echo # MDEV-22191: Range access is not picked when index_merge_sort_union is turned off
--echo #
set @save_optimizer_switch=@@optimizer_switch;
set @save_optimizer_switch="index_merge_sort_union=OFF";
CREATE TABLE t1 (a INT, INDEX(a));
INSERT INTO t1 VALUES (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
explain
SELECT * FROM t1 WHERE a > 5;
SELECT * FROM t1 WHERE a > 5;
set @@optimizer_switch=@save_optimizer_switch;
drop table t1;