RedundantColumnRemover no longer removes StoreProvider's columns for groupings

Orm/Xtensive.Orm.Tests/Issues/IssueJira0801_ReduntandColumnRemoverRemovesPartOfTempTableColumns.cs

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+// Copyright (C) 2020 Xtensive LLC.
+// This code is distributed under MIT license terms.
+// See the License.txt file in the project root for more information.
+// Created by: Alexey Kulakov
+// Created:    2020.11.16
+
+using NUnit.Framework;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using Xtensive.Orm.Configuration;
+using Xtensive.Orm.Tests.Issues.IssueJira0801_ReduntandColumnRemoverRemovesPartOfTempTableColumnsModel;
+
+namespace Xtensive.Orm.Tests.Issues.IssueJira0801_ReduntandColumnRemoverRemovesPartOfTempTableColumnsModel
+{
+  [HierarchyRoot]
+  public class EquipmentStateRecord : Entity
+  {
+    [Field, Key]
+    public long Id { get; private set; }
+
+    [Field]
+    public DateTime StartDate { get; set; }
+
+    [Field]
+    public DateTime? EndDate { get; set; }
+
+    [Field]
+    public Equipment Equipment { get; set; }
+
+    [Field]
+    public MachineStateType Type { get; set; }
+  }
+
+  [HierarchyRoot]
+  public class Equipment : Entity
+  {
+    [Field, Key]
+    public long Id { get; private set; }
+  }
+
+  public enum MachineStateType
+  {
+    Undefined = 0,
+    Production = 1,
+    EmergencyStop = 2,
+    Adjustment = 3,
+    SwitchedOn = 4,
+    SwitchedOff = 5
+  }
+
+  public class Segment
+  {
+    public long EquipmentId { get; set; }
+
+    public DateTime StartDate { get; set; }
+
+    public DateTime EndDate { get; set; }
+  }
+}
+
+namespace Xtensive.Orm.Tests.Issues
+{
+  public class IssueJira0801_ReduntandColumnRemoverRemovesPartOfTempTableColumns : AutoBuildTest
+  {
+    private long equipmentId;
+
+    protected override void CheckRequirements() =>
+      Require.AllFeaturesSupported(Providers.ProviderFeatures.TemporaryTables);
+
+    protected override DomainConfiguration BuildConfiguration()
+    {
+      var config = base.BuildConfiguration();
+      config.Types.Register(typeof(EquipmentStateRecord).Assembly, typeof(EquipmentStateRecord).Namespace);
+      return config;
+    }
+
+    protected override void PopulateData()
+    {
+      using (var session = Domain.OpenSession())
+      using (var tx = session.OpenTransaction()) {
+        var equipment = new Equipment();
+        equipmentId = equipment.Id;
+
+        foreach (var item in Enum.GetValues(typeof(MachineStateType)).Cast<MachineStateType>()) {
+          _ = new EquipmentStateRecord() {
+            Equipment = equipment,
+            Type = item,
+            StartDate = DateTime.Now.AddDays(-1),
+            EndDate = DateTime.Now.AddHours(-1)
+          };
+
+          _ = new EquipmentStateRecord() {
+            Equipment = equipment,
+            Type = item,
+            StartDate = DateTime.Now.AddDays(-2),
+            EndDate = DateTime.Now.AddHours(-2)
+          };
+
+          _ = new EquipmentStateRecord() {
+            Equipment = equipment,
+            Type = item,
+            StartDate = DateTime.Now.AddDays(-3),
+            EndDate = DateTime.Now.AddHours(-3)
+          };
+        }
+
+        tx.Complete();
+      }
+    }
+
+    [Test]
+    public void MainTest()
+    {
+      using (var session = Domain.OpenSession())
+      using (var tx = session.OpenTransaction()) {
+        var segments = GetSegments().Select(x => new { x.EquipmentId, x.StartDate, x.EndDate }).ToArray();
+        var remoteSegments = session.Query.Store(segments);
+
+        var testQuery = session.Query.All<EquipmentStateRecord>()
+          .Where(x => x.EndDate.HasValue)
+          .Join(remoteSegments,
+                record => record.Equipment.Id,
+                segment => segment.EquipmentId,
+                (record, segment) => new {
+                  EquipmentId = record.Equipment.Id,
+                  Type = record.Type,
+                  StateStartDate = record.StartDate,
+                  StateEndDate = record.EndDate.Value,
+                  SegmentStartDate = segment.StartDate,
+                  SegmentEndDate = segment.EndDate,
+                  StartTime = record.StartDate < segment.StartDate ? segment.StartDate : record.StartDate,
+                  EndTime = record.EndDate.Value > segment.EndDate ? segment.EndDate : record.EndDate.Value
+                })
+          .Where(x => x.StateStartDate < x.SegmentEndDate)
+          .GroupBy(x => new { x.EquipmentId, x.Type }, x => x.EndTime - x.StartTime)
+          .ToArray();
+      }
+    }
+
+    private IEnumerable<Segment> GetSegments()
+    {
+      yield return new Segment { EquipmentId = equipmentId, StartDate = DateTime.Now.AddDays(-1), EndDate = DateTime.Now };
+      yield return new Segment { EquipmentId = equipmentId, StartDate = DateTime.Now.AddDays(-2), EndDate = DateTime.Now };
+      yield return new Segment { EquipmentId = equipmentId, StartDate = DateTime.Now.AddDays(-3), EndDate = DateTime.Now };
+    }
+  }
+}