DISTINCT FROM NULL
Applies to ✅ Open Source Edition ✅ Express Edition ✅ Professional Edition ✅ Enterprise Edition
The DISTINCT predicate is a verbose way of NULL safe comparisons. If one of the operands is NULL, then it can be simplified to the NULL predicate.
Using Settings.transformPatternsDistinctFromNull, the following transformations can be achieved:
-- With Settings.transformPatternsDistinctFromNull active, this: SELECT a IS NOT DISTINCT FROM NULL, a IS DISTINCT FROM NULL FROM tab; -- ... is transformed into the equivalent expression: SELECT a IS NULL, a IS NOT NULL FROM tab;
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