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.

Simplify CASE abbreviations

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

The NVL or COALESCE CASE abbreviations may appear in expressions that have more simple counterparts using a simpler CASE abbreviation.

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

-- With Settings.transformPatternsSimplifyCaseAbbreviation active, this:
SELECT
  a IS NULL OR NVL(a = b, FALSE),
  COALESCE(a = b, a IS NULL),
  COALESCE(a, b) IS NOT DISTINCT FROM b,
  a IS NOT NULL AND NVL(a != b, TRUE),
  COALESCE(a != b, a IS NOT NULL),
  COALESCE(a, b) IS DISTINCT FROM b
FROM tab;

-- ... is transformed into the equivalent expression:
SELECT
  NULLIF(a, b) IS NULL,
  NULLIF(a, b) IS NULL,
  NULLIF(a, b) IS NULL,
  NULLIF(a, b) IS NOT NULL,
  NULLIF(a, b) IS NOT NULL,
  NULLIF(a, b) IS NOT NULL
FROM tab;

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