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Merge IN predicates
Applies to ✅ Open Source Edition ✅ Express Edition ✅ Professional Edition ✅ Enterprise Edition
An AND predicate combining IN predicates that share the same operands can often be merged into a single IN predicate comparing the left operand with the intersection of the right IN lists.
Using Settings.transformPatternsMergeInPredicates, the following transformations can be achieved:
-- With Settings.transformPatternsMergeInPredicates active, this: SELECT * FROM tab WHERE x IN (a, b, c) AND x IN (b, c, d); -- ... is transformed into the equivalent expression: SELECT * FROM tab WHERE x IN (b, c);
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