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Fix to #19499 - Query: null semantics not applied on subquery.Contain…
…s(null) We used to translate this into `NULL IN subquery` pattern, but this doesn't work because it doesn't match if the subquery also contains null. Fix is to convert this into subquery.Any(e => e == NULL), which translates to EXISTS with predicate and we can correctly apply null semantics. Also it allows us to translate contains on entities with composite keys. Also made several small fixes: - marked EXISTS and IN expressions as never nullable for purpose of null semantics, - optimized EXISITS (subquery) with predicate that resolves to false, directly into false, since empty subquery never exisits, - improves expression printer output for IN expression in the subquery scenario.
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