From 92421cdf1a6da2cbd34af66869b9ab809a4140c6 Mon Sep 17 00:00:00 2001
From: Sergei Pavlov <spavlov@servicetitan.com>
Date: Tue, 12 May 2026 12:14:55 -0700
Subject: [PATCH] Optimize `GenericExpressionVisitor.VisitUnknown()`

---
 .../Linq/Expressions/Visitors/GenericExpressionVisitor.cs  | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/Orm/Xtensive.Orm/Orm/Linq/Expressions/Visitors/GenericExpressionVisitor.cs b/Orm/Xtensive.Orm/Orm/Linq/Expressions/Visitors/GenericExpressionVisitor.cs
index 015f7200b6..6d28d2afa5 100644
--- a/Orm/Xtensive.Orm/Orm/Linq/Expressions/Visitors/GenericExpressionVisitor.cs
+++ b/Orm/Xtensive.Orm/Orm/Linq/Expressions/Visitors/GenericExpressionVisitor.cs
@@ -29,10 +29,9 @@ protected override Expression VisitUnknown(Expression e)
     if (e is T mapped)
       return VisitGenericExpression(mapped);
 
-    if (e is ExtendedExpression extendedExpression && extendedExpression.ExtendedType == ExtendedExpressionType.Marker) {
-      var marker = (MarkerExpression) e;
-      var result = Visit(marker.Target);
-      if (result == marker.Target)
+    if (e is MarkerExpression { Target: var target } marker) {
+      var result = Visit(target);
+      if (result == target)
         return result;
       return new MarkerExpression(result, marker.MarkerType);
     }