Igor Babaev b44171428a MDEV-19956 Queries with subqueries containing UNION are not parsed ...

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.

2019-09-23 09:57:37 -07:00

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