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

This is experimental functionality, and as such subject to change. Use at your own risk!

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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