Fix to #28648 - Json/Query: translate element access of a json array #29656
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maumar
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maumar
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src/EFCore.Relational/Query/Internal/CollectionIndexerToElementAtConvertingExpressionVisitor.cs
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src/EFCore.SqlServer/Query/Internal/SqlServerQuerySqlGenerator.cs
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smitpatel
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...EFCore.Relational/Query/Internal/CollectionIndexerToElementAtNormalizingExpressionVisitor.cs
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new version up @roji |
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| var subquery = mcne.Subquery; | ||
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| if (subquery is MethodCallExpression selectMethodCall | ||
| && selectMethodCall.Method.IsGenericMethod |
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Can integrate into pattern above (also block below)
| // MCNE(JSON_QUERY($[0].Collection)) | ||
| // MCNE(JSON_QUERY($[0].Collection).AsQueryable()) | ||
| // MCNE(JSON_QUERY($[0].Collection).Select(xx => xx.Includes()) | ||
| // MCNE(JSON_QUERY($[0].Collection).AsQueryable().Select(xx => xx.Includes()) |
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Can we also have AsQueryable after the Select? If so that's not handled below (can just do a while loop to unwrap until nothing is left).
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we don't produce those kinds of expressions - we add asqueryable when the collection is List or other Enumerable. So its always either AsQueryable().Select() or just Select(). Of course customers could also write queries like that (but why?)
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OK, thanks for clarifying, no problem.
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Converting indexer over list/array into ElementAt, so that nav expansion understands it and can perform pushown and inject MaterializeCollectionNavigation expression where necessary. In translation phase (specifically in ExpandSharedTypeEntities) we recognize the pattern that nav expansion creates and if the root is JsonQueryExpression, we apply collection index over it. JsonQueryExpression path segment now consists of two components - string representing JSON property name and SqlExpression representing collection index (it can be constant, parameter or any arbitrary expression that resolves to int) Deduplication is heavily restricted currently - we only de-duplicate projections whose additional path consists of JSON property accesses only (no collection indexes allowed). All queries projecting entities that need JSON array access must be set to NoTracking (for now). This is because we don't flow those collection index values into shaper. Instead, the ordinal keys are filled with dummy values, which prohibits us from doing proper change tracking. Fixes #28648
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Converting indexer over list/array into ElementAt, so that nav expansion understands it and can perform pushown and inject MaterializeCollectionNavigation expression where necessary. In translation phase we recognize the pattern that nav expansion creates and if the root is JsonQueryExpression, we apply collection index over it. JsonQueryExpression path segment now consists of two components - string representing JSON property name and SqlExpression representing collection index (it can be constant, parameter or any arbitrary expression that resolves to int)
Deduplication is heavily restricted currently - we only de-duplicate projections whose additional path consists of JSON property accesses only (no collection indexes allowed). All queries projecting entities that need JSON array access must be set to NoTracking (for now). This is because we don't flow those collection index values into shaper. Instead, the ordinal keys are filled with dummy values, which prohibits us from doing proper change tracking.
Fixes #28648