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MDEV-19363 Assertion `select_lex' failed in LEX::pop_select

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This patch corrects the patch for MDEV-19324. The latter did not
work properly in the cases when the transformation
  (SELECT ... ORDER BY ...) LIMIT ... =>
   SELECT ... ORDER BY ... LIMIT ...
was applied to the operands of a set operation.
This commit is contained in:
Igor Babaev
2019-05-01 18:20:06 -07:00
parent ea679c88c3
commit 2b7e080fae
3 changed files with 79 additions and 3 deletions
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15
mysql-test/main/brackets.test
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@ -139,5 +139,20 @@ eval explain format=json $q2;
drop table t1;
--echo #
--echo # MDEV-19363: ((SELECT ...) ORDER BY col ) LIMIT n UNION ...
--echo #
create table t1 (pk int);
insert into t1 values (5),(4),(1),(2),(3);
let $q=
((select * from t1 order by pk) limit 2) union (select * from t1 where pk > 4);
eval $q;
eval explain extended $q;
eval explain format=json $q;
drop table t1;
--echo # End of 10.4 tests