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Closes npgsql#2384
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...pressionTranslators/Internal/NpgsqlNetTopologySuiteAggregateMethodCallTranslatorPlugin.cs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,93 @@ | ||
| using NetTopologySuite.Algorithm; | ||
| using NetTopologySuite.Geometries.Utilities; | ||
| using NetTopologySuite.Operation.Union; | ||
|
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||
| // ReSharper disable once CheckNamespace | ||
| namespace Npgsql.EntityFrameworkCore.PostgreSQL.Query.ExpressionTranslators.Internal; | ||
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| public class NpgsqlNetTopologySuiteAggregateMethodCallTranslatorPlugin : IAggregateMethodCallTranslatorPlugin | ||
| { | ||
| public NpgsqlNetTopologySuiteAggregateMethodCallTranslatorPlugin( | ||
| IRelationalTypeMappingSource typeMappingSource, | ||
| ISqlExpressionFactory sqlExpressionFactory) | ||
| { | ||
| if (sqlExpressionFactory is not NpgsqlSqlExpressionFactory npgsqlSqlExpressionFactory) | ||
| { | ||
| throw new ArgumentException($"Must be an {nameof(NpgsqlSqlExpressionFactory)}", nameof(sqlExpressionFactory)); | ||
| } | ||
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| Translators = new IAggregateMethodCallTranslator[] | ||
| { | ||
| new NpgsqlNetTopologySuiteAggregateMethodTranslator(npgsqlSqlExpressionFactory, typeMappingSource) | ||
| }; | ||
| } | ||
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| public virtual IEnumerable<IAggregateMethodCallTranslator> Translators { get; } | ||
| } | ||
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| public class NpgsqlNetTopologySuiteAggregateMethodTranslator : IAggregateMethodCallTranslator | ||
| { | ||
| private static readonly MethodInfo GeometryCombineMethod | ||
| = typeof(GeometryCombiner).GetRuntimeMethod(nameof(GeometryCombiner.Combine), new[] { typeof(IEnumerable<Geometry>) })!; | ||
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| private static readonly MethodInfo ConvexHullMethod | ||
| = typeof(ConvexHull).GetRuntimeMethod(nameof(ConvexHull.Create), new[] { typeof(IEnumerable<Geometry>) })!; | ||
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| private static readonly MethodInfo UnionMethod | ||
| = typeof(UnaryUnionOp).GetRuntimeMethod(nameof(UnaryUnionOp.Union), new[] { typeof(IEnumerable<Geometry>) })!; | ||
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| private readonly NpgsqlSqlExpressionFactory _sqlExpressionFactory; | ||
| private readonly IRelationalTypeMappingSource _typeMappingSource; | ||
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| public NpgsqlNetTopologySuiteAggregateMethodTranslator( | ||
| NpgsqlSqlExpressionFactory sqlExpressionFactory, | ||
| IRelationalTypeMappingSource typeMappingSource) | ||
| { | ||
| _sqlExpressionFactory = sqlExpressionFactory; | ||
| _typeMappingSource = typeMappingSource; | ||
| } | ||
|
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| public virtual SqlExpression? Translate( | ||
| MethodInfo method, EnumerableExpression source, IReadOnlyList<SqlExpression> arguments, | ||
| IDiagnosticsLogger<DbLoggerCategory.Query> logger) | ||
| { | ||
| if (source.Selector is not SqlExpression sqlExpression | ||
| || (method != GeometryCombineMethod && method != UnionMethod && method != ConvexHullMethod)) | ||
| { | ||
| return null; | ||
| } | ||
|
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| var resultTypeMapping = _typeMappingSource.FindMapping(typeof(Geometry), sqlExpression.TypeMapping?.StoreType ?? "geometry"); | ||
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| if (method == GeometryCombineMethod || method == UnionMethod) | ||
| { | ||
| return _sqlExpressionFactory.AggregateFunction( | ||
| method == GeometryCombineMethod ? "ST_Collect" : "ST_Union", | ||
| new[] { sqlExpression }, | ||
| source, | ||
| nullable: true, | ||
| argumentsPropagateNullability: new[] { false }, | ||
| typeof(Geometry), | ||
| resultTypeMapping); | ||
| } | ||
|
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| // PostGIS has no built-in aggregate convex hull, but we can simply apply ST_Collect beforehand as recommended in the docs | ||
| // https://postgis.net/docs/ST_ConvexHull.html | ||
| return _sqlExpressionFactory.Function( | ||
| "ST_ConvexHull", | ||
| new[] | ||
| { | ||
| _sqlExpressionFactory.Function( | ||
| "ST_Collect", | ||
| new[] { sqlExpression }, | ||
| nullable: true, | ||
| argumentsPropagateNullability: new[] { false }, | ||
| typeof(Geometry), | ||
| resultTypeMapping) | ||
| }, | ||
| nullable: true, | ||
| argumentsPropagateNullability: new[] { true }, | ||
| typeof(Geometry), | ||
| resultTypeMapping); | ||
| } | ||
| } |
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