Fix to #16078 - Query/Null semantics: when checking if expression is null, just check it's constituents rather than entire expression #18560
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src/EFCore.Relational/Query/Internal/NullSemanticsRewritingExpressionVisitor.cs
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...onalShapedQueryCompilingExpressionVisitor.ParameterNullabilityOptimizingExpressionVisitor.cs
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new version up, made some changes, please take a final peek @smitpatel @roji |
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…null, just check it's constituents rather than entire expression Problem was that during null semantics rewrite we create IS NULL calls on the operands of the comparison. If the operands themselves are complicated, we were simply comparing the entire complex expression to null. In some cases, we only need to look at constituents, e.g. a + b == null <=> a == null || b == null. Also added other minor optimizations around null semantics: - non_nullable_column IS NULL resolves to false, - try to simplify expression after applying de Morgan transformations Also fixed a bug exposed by these changes, where column nullability would be incorrect for scenarios with owned types.
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Problem was that during null semantics rewrite we create IS NULL calls on the operands of the comparison. If the operands themselves are complicated, we were simply comparing the entire complex expression to null. In some cases, we only need to look at constituents, e.g. a + b == null <=> a == null || b == null.
Also added other minor optimizations around null semantics:
Also fixed a bug exposed by these changes, where column nullability would be incorrect for scenarios with owned types.