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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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