Merge CASE .. WHEN clauses
Applies to ✅ Open Source Edition ✅ Express Edition ✅ Professional Edition ✅ Enterprise Edition
When a searched CASE expression contains consecutive WHEN clauses returning the same value, then those WHEN clauses can be merged.
Using Settings.transformPatternsCaseMergeWhenWhen, the following transformations can be achieved:
-- With Settings.transformPatternsCaseMergeWhenWhen active, this:
SELECT
CASE
WHEN a = b THEN 1
WHEN c = d THEN 1
END
FROM tab;
-- ... is transformed into the equivalent expression:
SELECT
CASE
WHEN a = b OR c = d THEN 1
END
FROM tab;
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