Schrödinger's Cat #22123
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Schrödinger's Cat #22123
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Let A be the set of properties which are not sharing column with any principal. B be the subset of A where property is required. C be subset of A where property is optional. (hence A = B + C) The necessary condition for materialization without anything else be C1 - all required properties (excluding PK) must have a value (with or without sharing). - If A is empty, then C1 will be sufficient condition as it will be required dependent. - If B is non-empty, then C1 will cover those properties and be sufficient condition. - If B is empty and then C is non-empty, then materialize if there is at least 1 non-null value in C along with C1 being true. - Otherwise null. If there are no required properties other than PK (essentially C1 does not exist). B is by definition empty. - If A is empty then always materialize. - If A is non-empty implies C is non-empty, then materialize if there is at least 1 non-null value in C. Resolves #22054
src/EFCore.Relational/Query/RelationalEntityShaperExpression.cs
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src/EFCore.Relational/Query/RelationalEntityShaperExpression.cs
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AndriySvyryd
approved these changes
Aug 19, 2020
Co-authored-by: Andriy Svyryd <AndriySvyryd@users.noreply.github.com>
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Query: New set of conditions to materialize optional dependents
Let A be the set of properties which are not sharing column with any principal.
B be the subset of A where property is required.
C be subset of A where property is optional. (hence A = B + C)
The necessary condition for materialization without anything else be C1 - all required properties (excluding PK) must have a value (with or without sharing).
If there are no required properties other than PK (essentially C1 does not exist). B is by definition empty.
Resolves #22054