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Flatten CASE
Applies to ✅ Open Source Edition ✅ Express Edition ✅ Professional Edition ✅ Enterprise Edition
When a searched CASE expression nests another CASE expression in its ELSE clause, that can be flattened into the top level CASE expression. This does not affect the simple CASE expression.
Using Settings.transformPatternsFlattenCase, the following transformations can be achieved:
-- With Settings.transformPatternsFlattenCase active, this:
SELECT
CASE
WHEN a = b THEN 1
ELSE CASE
WHEN c = d THEN 2
END
END
FROM tab;
-- ... is transformed into the equivalent expression:
SELECT
CASE
WHEN a = b THEN 1
WHEN c = d THEN 2
END
FROM tab;
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