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Merge CASE .. WHEN and ELSE clauses
Applies to ✅ Open Source Edition ✅ Express Edition ✅ Professional Edition ✅ Enterprise Edition
When a searched CASE expression's last WHEN clause returns the same value as the ELSE clause, then the WHEN clause is redundant. If it's the only WHEN clause, then the entire CASE exression is redundant.
Using Settings.transformPatternsCaseMergeWhenElse, the following transformations can be achieved:
-- With Settings.transformPatternsCaseMergeWhenElse active, this: SELECT CASE WHEN a = b THEN x WHEN c = d THEN y ELSE y END, CASE WHEN a = b THEN x ELSE x END FROM tab; -- ... is transformed into the equivalent expression: SELECT CASE WHEN a = b THEN x ELSE y END, x FROM tab;
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