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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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