test: add issue test case

test/Gridify.Tests/IssueTests/Issue155Tests.cs

@@ -0,0 +1,34 @@
+using System.Collections.Generic;
+using System.Linq;
+using Xunit;
+
+namespace Gridify.Tests.IssueTests;
+
+public class Issue155Tests
+{
+   [Fact]
+   public void ComparingFiledAWithFieldB_ShouldReturnTheCorrectResult()
+   {
+      // arrange
+      List<Item> items =
+      [
+         new Item("Item1", [new TimeSchedule(1, 2), new TimeSchedule(2, 3)]),
+         new Item("Item2", [new TimeSchedule(1, 4), new TimeSchedule(4, 3)]),
+         new Item("Item3", [new TimeSchedule(3, 2), new TimeSchedule(2, 3)]),
+      ];
+      var expected = items.AsQueryable().Where(x => x.Schedules.Any(s => s.End < s.Start));
+
+      // act
+      var actual = new QueryBuilder<Item>()
+         .AddMap("start", p => p.Schedules.Select(x => x.Start))
+         .AddMap("end", p => p.Schedules.Select(x => x.End))
+         .AddCondition("end < (start)")
+         .Build(items.AsQueryable());
+
+      // assert
+      Assert.Equal(expected.ToString(), actual.ToString());
+   }
+
+   private record Item(string Name, List<TimeSchedule> Schedules);
+   private record TimeSchedule(int Start, int End);
+}