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Trivial predicates
Applies to ✅ Open Source Edition ✅ Express Edition ✅ Professional Edition ✅ Enterprise Edition
predicates can be trivial, in case of which the expression can be removed and replaced by a TRUE or FALSE condition.
Using Settings.transformPatternsTrivialPredicates, the following transformations can be achieved:
-- With Settings.transformPatternsTrivialPredicates active, this: SELECT a IS NOT DISTINCT FROM a, a IS DISTINCT FROM a, a >= a, a <= a, a > a, a < a, const IS NOT NULL, const IS NULL, TRUE AND FALSE, TRUE OR FALSE, NOT TRUE, NOT FALSE, p = TRUE, p <> TRUE, p = FALSE, p <> FALSE, p AND (q OR p), p OR (q AND p) -- and many more FROM tab; -- ... is transformed into the equivalent expression: SELECT TRUE, -- a IS NOT DISTINCT FROM a FALSE, -- a IS DISTINCT FROM a a = a, -- a >= a a = a, -- a <= a a != a, -- a > a a != a, -- a < a TRUE, -- const IS NOT NULL FALSE, -- const IS NULL FALSE, -- TRUE AND FALSE TRUE, -- TRUE OR FALSE FALSE, -- NOT TRUE TRUE, -- NOT FALSE p, -- p = TRUE NOT (p), -- p <> TRUE NOT (p), -- p = FALSE p, -- p <> FALSE, p, -- p AND (q OR p) p -- p OR (q AND p) -- and many more FROM tab;
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