Repeated arithmetic 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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