Marios Trivyzas 36da6e1671
SQL: Introduce IsNull node to simplify expressions (#35206)
Add `IsNull` node in parser to simplify expressions so that `<value> IS NULL` is
no longer translated internally to `NOT(<value> IS NOT NULL)`

Replace `IsNotNullProcessor` with `CheckNullProcessor` to encapsulate both
isNull and isNotNull functionality.

Closes: #34876
Fixes: #35171
2018-11-09 11:32:38 +01:00
..
2018-11-06 18:42:57 +02:00