[release/8.0] Contains nullability processing #32265
Merged
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Fixes #32208, backports #32214
Description
When doing SQL nullability processing for an non-subquery InExpression (e.g. Contains LINQ operator), the expression's item was visited but the results were discarded, not being taken into account.
Customer impact
This can cause bugs in any LINQ query containing
x.Contains(y)
, where y (the item) requires some sort of nullability processing. For example, this causes QueryBugsTest.Nested_contains_with_enum to fail when the SQL compatibility level is set to low (but that's just one example).How found
Customer reported on 8.0
Regression
Yes.
Testing
Added tests.
Risk
Very low; a quirk has been added.