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Add Std Dev and Variance using EF.Functions (#269)
* Add Std Dev and Variance using EF.Functions
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30 changes: 30 additions & 0 deletions
30
...Core.Jet/Query/ExpressionTranslators/Internal/JetAggregateMethodCallTranslatorProvider.cs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,30 @@ | ||
| using Microsoft.EntityFrameworkCore.Query; | ||
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| namespace EntityFrameworkCore.Jet.Query.ExpressionTranslators.Internal; | ||
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| /// <summary> | ||
| /// This is an internal API that supports the Entity Framework Core infrastructure and not subject to | ||
| /// the same compatibility standards as public APIs. It may be changed or removed without notice in | ||
| /// any release. You should only use it directly in your code with extreme caution and knowing that | ||
| /// doing so can result in application failures when updating to a new Entity Framework Core release. | ||
| /// </summary> | ||
| public class JetAggregateMethodCallTranslatorProvider : RelationalAggregateMethodCallTranslatorProvider | ||
| { | ||
| /// <summary> | ||
| /// This is an internal API that supports the Entity Framework Core infrastructure and not subject to | ||
| /// the same compatibility standards as public APIs. It may be changed or removed without notice in | ||
| /// any release. You should only use it directly in your code with extreme caution and knowing that | ||
| /// doing so can result in application failures when updating to a new Entity Framework Core release. | ||
| /// </summary> | ||
| public JetAggregateMethodCallTranslatorProvider(RelationalAggregateMethodCallTranslatorProviderDependencies dependencies) | ||
| : base(dependencies) | ||
| { | ||
| var sqlExpressionFactory = dependencies.SqlExpressionFactory; | ||
| var typeMappingSource = dependencies.RelationalTypeMappingSource; | ||
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| AddTranslators( | ||
| [ | ||
| new JetStatisticsAggregateMethodTranslator(sqlExpressionFactory, typeMappingSource) | ||
| ]); | ||
| } | ||
| } |
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72 changes: 72 additions & 0 deletions
72
...EFCore.Jet/Query/ExpressionTranslators/Internal/JetStatisticsAggregateMethodTranslator.cs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,72 @@ | ||
| using System.Collections.Generic; | ||
| using System.Reflection; | ||
| using Microsoft.EntityFrameworkCore; | ||
| using Microsoft.EntityFrameworkCore.Diagnostics; | ||
| using Microsoft.EntityFrameworkCore.Query; | ||
| using Microsoft.EntityFrameworkCore.Query.SqlExpressions; | ||
| using Microsoft.EntityFrameworkCore.Storage; | ||
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| namespace EntityFrameworkCore.Jet.Query.ExpressionTranslators.Internal; | ||
|
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| /// <summary> | ||
| /// This is an internal API that supports the Entity Framework Core infrastructure and not subject to | ||
| /// the same compatibility standards as public APIs. It may be changed or removed without notice in | ||
| /// any release. You should only use it directly in your code with extreme caution and knowing that | ||
| /// doing so can result in application failures when updating to a new Entity Framework Core release. | ||
| /// </summary> | ||
| public class JetStatisticsAggregateMethodTranslator : IAggregateMethodCallTranslator | ||
| { | ||
| private readonly ISqlExpressionFactory _sqlExpressionFactory; | ||
| private readonly RelationalTypeMapping _doubleTypeMapping; | ||
|
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| /// <summary> | ||
| /// This is an internal API that supports the Entity Framework Core infrastructure and not subject to | ||
| /// the same compatibility standards as public APIs. It may be changed or removed without notice in | ||
| /// any release. You should only use it directly in your code with extreme caution and knowing that | ||
| /// doing so can result in application failures when updating to a new Entity Framework Core release. | ||
| /// </summary> | ||
| public JetStatisticsAggregateMethodTranslator( | ||
| ISqlExpressionFactory sqlExpressionFactory, | ||
| IRelationalTypeMappingSource typeMappingSource) | ||
| { | ||
| _sqlExpressionFactory = sqlExpressionFactory; | ||
| _doubleTypeMapping = typeMappingSource.FindMapping(typeof(double))!; | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// This is an internal API that supports the Entity Framework Core infrastructure and not subject to | ||
| /// the same compatibility standards as public APIs. It may be changed or removed without notice in | ||
| /// any release. You should only use it directly in your code with extreme caution and knowing that | ||
| /// doing so can result in application failures when updating to a new Entity Framework Core release. | ||
| /// </summary> | ||
| public virtual SqlExpression? Translate( | ||
| MethodInfo method, | ||
| EnumerableExpression source, | ||
| IReadOnlyList<SqlExpression> arguments, | ||
| IDiagnosticsLogger<DbLoggerCategory.Query> logger) | ||
| { | ||
| // Docs: https://docs.microsoft.com/sql/t-sql/functions/aggregate-functions-transact-sql | ||
|
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| if (method.DeclaringType != typeof(JetDbFunctionsExtensions) | ||
| || source.Selector is not SqlExpression sqlExpression) | ||
| { | ||
| return null; | ||
| } | ||
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| var functionName = method.Name switch | ||
| { | ||
| nameof(JetDbFunctionsExtensions.StandardDeviationSample) => "StDev", | ||
| nameof(JetDbFunctionsExtensions.StandardDeviationPopulation) => "StDevP", | ||
| nameof(JetDbFunctionsExtensions.VarianceSample) => "Var", | ||
| nameof(JetDbFunctionsExtensions.VariancePopulation) => "VarP", | ||
| _ => null | ||
| }; | ||
|
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| if (functionName is null) | ||
| { | ||
| return null; | ||
| } | ||
|
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| return _sqlExpressionFactory.Function(functionName, [sqlExpression], nullable: true, argumentsPropagateNullability: [false], typeof(double), _doubleTypeMapping); | ||
| } | ||
| } |
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