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This is experimental functionality, and as such subject to change. Use at your own risk!
This documentation is for the unreleased development version of jOOQ. Click on the above version links to get this documentation for a supported version of jOOQ.
Merge NOT with DISTINCT predicate
Applies to ✅ Open Source Edition ✅ Express Edition ✅ Professional Edition ✅ Enterprise Edition
The NOT predicate inverts its argument predicate. If the argument predicate is a DISTINCT predicate, we can simply merge the two operators to invert the argument into the inverse DISTINCT predicate.
Using Settings.transformPatternsNotNotDistinct, the following transformations can be achieved:
-- With Settings.transformPatternsNotNotDistinct active, this: SELECT NOT (a IS NOT DISTINCT FROM b), NOT (a IS DISTINCT FROM b) FROM tab; -- ... is transformed into the equivalent expression: SELECT a IS DISTINCT FROM b, -- NOT (a IS NOT DISTINCT FROM b) a IS NOT DISTINCT FROM b -- NOT (a IS DISTINCT FROM b) FROM tab;
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