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Repeated NOT

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

The NOT unary operator reverses itself, when called repeatedly, meaning that redundant NOT operators can be removed.

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

-- With Settings.transformPatternsNotNot active, this:
  NOT (NOT (x = 1)),
  NOT (NOT (NOT (x = 1)))
FROM tab;

-- ... is transformed into the equivalent expression:
  x = 1,       -- NOT (NOT (x = 1))
  NOT (x = 1), -- NOT (NOT (NOT (x = 1)))
FROM tab;


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