[release/9.0-staging] Fix to #35239 - EF9: SaveChanges() is significantly slower in .NET9 vs. .NET8 when using .ToJson() Mapping vs. PostgreSQL Legacy POCO mapping #35360
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maumar
changed the title
…s. .NET8 when using .ToJson() Mapping vs. PostgreSQL Legacy POCO mapping
AndriySvyryd
approved these changes
Dec 20, 2024
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Less risky version of the #35326 for patch. If the type TElement type arguments match between element comparer and list comparer, we pass the Equals/Snapshot/Hashcode lambas from element to the list comparer method. Otherwise we fallback to the legacy code, which we know works but constructs redundant comparer objects (perf problem). This is not a real issue however - in reality the legacy code would only be invoked for nested collection scenarios and these are not supported (outside of InMemory). All we really need to do is to construct some Equals, Snapshot and Hashcode expressions (and not throw in the process)
Fixes #35239