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

This is experimental functionality, and as such subject to change. Use at your own risk!

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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