Add test for conditional experssion in partial indexes

index filter builder uses Expression processor, just in case we should have
such test case

Author: alex-kulakov

Orm/Xtensive.Orm.Tests/Storage/PartialIndexTest.cs

@@ -1,4 +1,4 @@
-// Copyright (C) 2011-2021 Xtensive LLC.
+// Copyright (C) 2011-2024 Xtensive LLC.
 // This code is distributed under MIT license terms.
 // See the License.txt file in the project root for more information.
 // Created by: Denis Krjuchkov
@@ -164,6 +164,16 @@ public class ContainsOperatorSupport : TestBase
     public string TestField { get; set; }
   }
 
+  [HierarchyRoot, Index(nameof(TestField), Filter = nameof(Index))]
+  public class ConditionalExpressionSuport : TestBase
+  {
+    public static Expression<Func<ConditionalExpressionSuport, bool>> Index =>
+      test => test.Id == ((test.TestField == null) ? 100 : 200) ? test.TestField.Contains("hello") : false;
+
+    [Field]
+    public string TestField { get; set; }
+  }
+
   [HierarchyRoot,
     Index(nameof(TestField), Filter = nameof(More), Name = "MoreIndex"),
     Index(nameof(TestField), Filter = nameof(Less), Name = "LessIndex")]
@@ -543,6 +553,9 @@ private void AssertBuildFailure(params Type[] entities)
     [Test]
     public void ContainsOperatorSupportTest() => AssertBuildSuccess(typeof(ContainsOperatorSupport));
 
+    [Test]
+    public void ConditionalOperationSupportTest() => AssertBuildSuccess(typeof(ConditionalExpressionSuport));
+
     [Test]
     public void DoubleIndexWithNameTest() => AssertBuildSuccess(typeof(DoubleIndexWithName));