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MDEV-19956 Queries with subqueries containing UNION are not parsed

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Shift-Reduce conflicts prevented parsing some queries with subqueries that
used set operations when the subqueries occurred in expressions or in IN
predicands.
The grammar rules for query expression were transformed in order to avoid
these conflicts. New grammar rules employ an idea taken from MySQL 8.0.
This commit is contained in:
Igor Babaev
2019-09-20 09:03:38 -07:00
parent e3da362c03
commit b44171428a
21 changed files with 7212 additions and 593 deletions
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mysql-test/main/parser.test
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@ -1544,7 +1544,6 @@ SELECT @@GLOBAL.role;
--echo #
create table t1 (a int);
--error ER_WRONG_USAGE
(select * from t1) for update;
--error ER_WRONG_USAGE
(select * from t1) union (select * from t1) for update;