test for #3847

Tests/Linq/UserTests/Issue3847Tests.cs

@@ -0,0 +1,56 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.ComponentModel.DataAnnotations;
+using System.Linq;
+using System.Runtime.Serialization;
+using LinqToDB;
+using LinqToDB.Data;
+using LinqToDB.Mapping;
+using Newtonsoft.Json;
+using NUnit.Framework;
+
+namespace Tests.UserTests.Test3847
+{
+	public class OutfeedTransportOrderDTO
+	{
+		public virtual Guid Id { get; set; }
+	}
+
+	[TestFixture]
+	public class Issue3847Tests : TestBase
+	{
+		[Test]
+		public void Test3847([IncludeDataSources(TestProvName.AllSQLite, TestProvName.AllSqlServer, TestProvName.AllPostgreSQL)] string configuration)
+		{
+			using (var db = GetDataContext(
+				configuration,
+				new FluentMappingBuilder()
+					.Entity<OutfeedTransportOrderDTO>()
+						.HasTableName("Test3847_OutfeedTransportOrder")
+					.Build()
+					.MappingSchema))
+			{
+				using (db.CreateLocalTable<OutfeedTransportOrderDTO>())
+				{
+					var _lastCheck = new Dictionary<Guid, DateTime>();
+					var _nextCheck = new Dictionary<Guid, DateTime>();
+					IQueryable<KeyValuePair<Guid, DateTime>> lastcheckquery = _lastCheck.AsQueryable();
+					IQueryable<KeyValuePair<Guid, DateTime>> nextcheckquery = _nextCheck.AsQueryable();
+
+					var qry = from outfeed in db.GetTable<OutfeedTransportOrderDTO>()
+							  select new
+							  {
+								  OutfeedTransportOrder = outfeed,
+								  LastCheck = lastcheckquery.Where(x => x.Key == outfeed.Id).Select(x => (DateTime?)x.Value).FirstOrDefault(),
+								  NextCheck = nextcheckquery.Where(x => x.Key == outfeed.Id).Select(x => (DateTime?)x.Value).FirstOrDefault(),
+
+							  };
+
+					var d = qry.ToList();
+					var sql = ((DataConnection)db).LastQuery;
+				}
+			}
+		}
+	}
+}