Available in versions: Dev (3.18)

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

This documentation is for the unreleased development version of jOOQ. Click on the above version links to get this documentation for a supported version of jOOQ.

Flatten CASE abbreviations

Applies to ✅ Open Source Edition   ✅ Express Edition   ✅ Professional Edition   ✅ Enterprise Edition

The NVL or COALESCE CASE abbreviations can be nested, but this doesn't add any value or clarity to the query. Hence, we flatten them.

Using Settings.transformPatternsFlattenCaseAbbreviation, the following transformations can be achieved:

-- With Settings.transformPatternsFlattenCaseAbbreviation active, this:
SELECT
  NVL(NVL(a, b), c),
  COALESCE(NVL(a, b), c, NVL(d, e))
  COALESCE(a, COALESCE(b, c, d), e)
FROM tab;

-- ... is transformed into the equivalent expression:
SELECT
  COALESCE(a, b, c),
  COALESCE(a, b, c, d, e),
  COALESCE(a, b, c, d, e)
FROM tab;

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