Fixed bug: incompatible coalesce types

src/EFCore.Ydb/CHANGELOG.md

@@ -1,3 +1,4 @@
+- Fixed bug: incompatible coalesce types ([#531](https://github.com/ydb-platform/ydb-dotnet-sdk/issues/531)).
 - Upgraded ADO.NET provider version: `0.17.0` → `0.24.0`.
 - Fixed Decimal precision/scale mapping in EF provider.
 - Supported Guid (Uuid YDB type).

src/EFCore.Ydb/src/Query/Internal/Translators/YdbQueryableAggregateMethodTranslator.cs

@@ -133,7 +133,7 @@ public class YdbQueryableAggregateMethodTranslator(
                             [sumSqlExpression],
                             nullable: true,
                             argumentsPropagateNullability: ArrayUtil.FalseArrays[1],
-                            typeof(decimal)),
+                            typeof(long)),
                         sumInputType,
                         sumSqlExpression.TypeMapping);
                 }

src/EFCore.Ydb/src/Storage/Internal/Mapping/YdbDecimalTypeMapping.cs

@@ -10,7 +10,7 @@ public class YdbDecimalTypeMapping : DecimalTypeMapping
 
     public new static YdbDecimalTypeMapping Default => new();
 
-    public YdbDecimalTypeMapping() : this(
+    private YdbDecimalTypeMapping() : this(
         new RelationalTypeMappingParameters(
             new CoreTypeMappingParameters(typeof(decimal)),
             storeType: "Decimal",
@@ -41,4 +41,7 @@ protected override void ConfigureParameter(DbParameter parameter)
         if (Scale is { } s)
             parameter.Scale = (byte)s;
     }
+
+    protected override string GenerateNonNullSqlLiteral(object value) =>
+        $"Decimal('{base.GenerateNonNullSqlLiteral(value)}', {Precision ?? DefaultPrecision}, {Scale ?? DefaultScale})";
 }

src/EFCore.Ydb/src/Storage/Internal/YdbTypeMappingSource.cs

@@ -125,12 +125,7 @@ RelationalTypeMappingSourceDependencies relationalDependencies
         var clrType = mappingInfo.ClrType;
         var storeTypeName = mappingInfo.StoreTypeName;
 
-        if (storeTypeName is null)
-        {
-            return clrType is null ? null : ClrTypeMapping.GetValueOrDefault(clrType);
-        }
-
-        if (!StoreTypeMapping.TryGetValue(storeTypeName, out var mappings))
+        if (storeTypeName is null || !StoreTypeMapping.TryGetValue(storeTypeName, out var mappings))
         {
             return clrType is null ? null : ClrTypeMapping.GetValueOrDefault(clrType);
         }

src/EFCore.Ydb/test/EntityFrameworkCore.Ydb.FunctionalTests/Query/DecimalParameterizedYdbTest.cs

@@ -0,0 +1,143 @@
+using EntityFrameworkCore.Ydb.Extensions;
+using EntityFrameworkCore.Ydb.FunctionalTests.TestUtilities;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Infrastructure;
+using Microsoft.EntityFrameworkCore.Storage;
+using Xunit;
+
+namespace EntityFrameworkCore.Ydb.FunctionalTests.Query;
+
+public class DecimalParameterizedYdbTest
+{
+    private static DbContextOptions<ParametricDecimalContext> BuildOptions() =>
+        new DbContextOptionsBuilder<ParametricDecimalContext>()
+            .UseYdb("Host=localhost;Port=2136")
+            .EnableServiceProviderCaching(false)
+            .LogTo(Console.WriteLine)
+            .Options;
+
+    public static TheoryData<int, int, decimal> SuccessCases => new()
+    {
+        { 22, 9, 1.23456789m },
+        { 30, 10, 123.4567890123m },
+        { 18, 2, 12345678.91m },
+        { 10, 0, 9999999999m },
+        { 22, 9, -0.123456789m },
+        { 5, 2, 12.34m },
+        { 30, 10, 0.0000000001m }
+    };
+
+    public static TheoryData<int, int, decimal> OverflowCases => new()
+    {
+        { 15, 2, 123456789012345.67m },
+        { 10, 0, 12345678901m },
+        { 22, 9, 1.0000000001m },
+        { 18, 2, 1.239m },
+        { 18, 2, 100000000000000000m },
+        { 22, 9, 12345678901234567890.123456789m },
+        { 22, 9, -12345678901234567890.123456789m },
+        { 4, 2, 123.456m },
+        { 1, 0, 10m },
+        { 5, 0, 100000m }
+    };
+
+    private static ParametricDecimalContext NewCtx(int p, int s) => new(BuildOptions(), p, s);
+
+    [Theory]
+    [MemberData(nameof(SuccessCases))]
+    public async Task Should_RoundtripDecimal_When_ValueFitsPrecisionAndScale(int p, int s, decimal value)
+    {
+        await using var testStore = YdbTestStoreFactory.Instance.Create("DecimalParameterizedYdb");
+
+        await using var ctx = NewCtx(p, s);
+        await testStore.CleanAsync(ctx);
+        await ctx.Database.EnsureCreatedAsync();
+        try
+        {
+            var e = new ParamItem { Price = value };
+            ctx.Add(e);
+            await ctx.SaveChangesAsync();
+            var got = await ctx.Items.SingleAsync(x => x.Id == e.Id);
+            Assert.Equal(value, got.Price);
+            var tms = ctx.GetService<IRelationalTypeMappingSource>();
+            var et = ctx.Model.FindEntityType(typeof(ParamItem))!;
+            var prop = et.FindProperty(nameof(ParamItem.Price))!;
+            var mapping = tms.FindMapping(prop)!;
+            Assert.Equal($"Decimal({p}, {s})", mapping.StoreType);
+        }
+        finally
+        {
+            await ctx.Database.EnsureDeletedAsync();
+        }
+    }
+
+    [Theory]
+    [MemberData(nameof(OverflowCases))]
+    public async Task Should_ThrowOverflow_When_ValueExceedsPrecisionOrScale(int p, int s, decimal value)
+    {
+        await using var testStore = YdbTestStoreFactory.Instance.Create("DecimalParameterizedYdb");
+
+        await using var ctx = NewCtx(p, s);
+        await testStore.CleanAsync(ctx);
+        await ctx.Database.EnsureCreatedAsync();
+        try
+        {
+            ctx.Add(new ParamItem { Price = value });
+            await Assert.ThrowsAsync<DbUpdateException>(() => ctx.SaveChangesAsync());
+        }
+        finally
+        {
+            await ctx.Database.EnsureDeletedAsync();
+        }
+    }
+
+    [Theory]
+    [MemberData(nameof(SuccessCases))]
+    public async Task Should_SumDecimal_When_ValueFitsPrecisionAndScale(int p, int s, decimal value)
+    {
+        await using var testStore = YdbTestStoreFactory.Instance.Create("DecimalParameterizedYdb");
+
+        const int multiplier = 5;
+        await using var ctx = NewCtx(p, s);
+        await testStore.CleanAsync(ctx);
+        await ctx.Database.EnsureCreatedAsync();
+        try
+        {
+            for (var i = 0; i < multiplier; i++)
+                ctx.Add(new ParamItem { Price = value });
+            await ctx.SaveChangesAsync();
+            var got = await ctx.Items.Select(x => x.Price).SumAsync();
+
+            Assert.Equal(value * multiplier, got);
+
+            var tms = ctx.GetService<IRelationalTypeMappingSource>();
+            var et = ctx.Model.FindEntityType(typeof(ParamItem))!;
+            var prop = et.FindProperty(nameof(ParamItem.Price))!;
+            var mapping = tms.FindMapping(prop)!;
+            Assert.Equal($"Decimal({p}, {s})", mapping.StoreType);
+        }
+        finally
+        {
+            await ctx.Database.EnsureDeletedAsync();
+        }
+    }
+
+    public sealed class ParametricDecimalContext(DbContextOptions<ParametricDecimalContext> options, int p, int s)
+        : DbContext(options)
+    {
+        public DbSet<ParamItem> Items => Set<ParamItem>();
+
+        protected override void OnModelCreating(ModelBuilder modelBuilder) => modelBuilder.Entity<ParamItem>(b =>
+        {
+            b.ToTable($"Items_{p}_{s}");
+            b.HasKey(x => x.Id);
+            b.Property(x => x.Price).HasPrecision(p, s);
+        });
+    }
+
+    public sealed class ParamItem
+    {
+        public int Id { get; init; }
+        public decimal Price { get; init; }
+    }
+}