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This is experimental functionality, and as such subject to change. Use at your own risk!
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: SELECT x IN (a), x NOT IN (a) FROM tab; -- ... is transformed into the equivalent expression: SELECT x = a, -- x IN (a), x != a -- x NOT IN (a) FROM tab;
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