Available in versions: Dev (3.18) | Latest (3.17)

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.

Empty scalar subquery

Applies to ✅ Open Source Edition   ✅ Express Edition   ✅ Professional Edition   ✅ Enterprise Edition

When a scalar subquery is provably empty, we can replace it with NULL.

Using Settings.transformPatternsEmptyScalarSubquery, the following transformations can be achieved:

-- With Settings.transformPatternsEmptyScalarSubquery active, this:
SELECT
  (SELECT c FROM tab WHERE FALSE)
;

-- ... is transformed into the equivalent expression:
SELECT
  NULL -- (SELECT c FROM tab WHERE FALSE)
;

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