ClickHouse/tests/queries/0_stateless/02035_isNull_isNotNull_format.sql

-- { echo }
explain syntax select null is null;
explain syntax select null is not null;
explain syntax select isNull(null);
explain syntax select isNotNull(null);
Transform isNull/isNotNull to IS NULL/IS NOT NULL (for external dbs) This is required to support queries (like `foo IS NULL`) to external databases (i.e. MySQL). This patch had been submitted separately, due to: - avoid mixing patches - run CI (and update tests references) 2021-09-27 18:04:12 +00:00			`-- { echo }`
			`explain syntax select null is null;`
			`explain syntax select null is not null;`
			`explain syntax select isNull(null);`
			`explain syntax select isNotNull(null);`