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Available in versions: Dev (3.20) | Latest (3.19) | 3.18 | 3.17

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

Merge BIT_NOT with BIT_XNOR

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

The BIT_NOT function bitwise inverts its argument value. If the argument value is a BIT_XNOR function, we can simply merge the two functions.

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

-- With Settings.transformPatternsBitNotXNor active, this:
SELECT
  ~(bitxnor(a, b)),
  ~(bitxor(a, b))
FROM tab;

-- ... is transformed into the equivalent expression:
SELECT
  bitxor(a, b), -- ~(bitxnor(a, b))
  bitxnor(a, b) -- ~(bitxor(a, b))
FROM tab;

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