Available in versions: Dev (3.18) | Latest (3.17)

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

Repeated negation

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

The negation unary operator reverses itself, when called repeatedly, meaning that redundant NEG() operators can be removed.

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

-- With Settings.transformPatternsNegNeg active, this:
SELECT
  -(-(x)), 
  -(-(-(x)))
FROM tab;

-- ... is transformed into the equivalent expression:
SELECT 
  x,  -- -(-(x)) 
  -x, -- -(-(-(x)))
FROM tab;

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