Available in versions: Dev (3.19) | Latest (3.18) | 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.

Normalise IN list with single element to comparison

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

When comparing an IN predicate with a single value, then it may be beneficial for other pattern replacement if that expression is normalised to a comparison predicate.

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

-- With Settings.transformPatternsNormaliseInListSingleElementToComparison active, this:
  x IN (a),
  x NOT IN (a) 
FROM tab;

-- ... is transformed into the equivalent expression:
  x = a, -- x IN (a),
  x != a -- x NOT IN (a) 
FROM tab;


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