test for issue #4390

Author: jogibear9988

Tests/Linq/UserTests/Issue4390Tests.cs

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+using System.Linq;
+using FluentAssertions;
+using LinqToDB;
+using LinqToDB.Mapping;
+using NUnit.Framework;
+using System.Linq.Dynamic.Core;
+using System.Linq.Dynamic.Core.CustomTypeProviders;
+using System.Collections.Generic;
+using System;
+
+namespace Tests.UserTests
+{
+	[TestFixture]
+	public class Issue4390Tests : TestBase
+	{
+		[Table]
+		public class InfeedAdviceDTO
+		{
+			[Column] public int Id { get; set; }
+		}
+
+		[Table]
+		public class InventoryResourceDTO
+		{
+			[Column] public int InfeedAdviceID { get; set; }
+		}
+		public class MlogCombined1
+		{
+			public InfeedAdviceDTO? InfeedAdvice { get; set; }
+
+			public int? Count { get; set; }
+		}
+
+		public class MlogCombined2
+		{
+			public MlogCombined1? MlogCombined1 { get; set; }
+		}
+
+		[Test]
+		public void Issue4390Test([IncludeDataSources(TestProvName.AllSQLite)] string context)
+		{
+			using (var db = GetDataContext(context))
+			using (db.CreateLocalTable<InfeedAdviceDTO>())
+			using (db.CreateLocalTable<InventoryResourceDTO>())
+			{
+				db.Insert(new InventoryResourceDTO() { InfeedAdviceID = 1 });
+				db.Insert(new InfeedAdviceDTO() { Id = 1 });
+
+				var irs = from ir in db.GetTable<InventoryResourceDTO>() select ir;
+
+				var qry = from infeed in db.GetTable<InfeedAdviceDTO>()
+								join inventory in db.GetTable<InventoryResourceDTO>() on infeed.Id equals inventory.InfeedAdviceID
+								select new MlogCombined2
+								{
+									MlogCombined1 = new MlogCombined1
+									{
+										InfeedAdvice = infeed,
+										Count = irs.Count(x => x.InfeedAdviceID == infeed.Id),
+									}
+								};
+
+				var l = qry.Where(x => x.MlogCombined1 != null).Count();
+			}
+		}
+	}
+}