Don't use same table in join when it is also primary target table (#3263)

Author: ChrisJollyAU

src/EFCore.PG/Query/Internal/NpgsqlQuerySqlGenerator.cs

@@ -341,7 +341,7 @@ protected override Expression VisitUpdate(UpdateExpression updateExpression)
                     var table = selectExpression.Tables[i];
                     var joinExpression = table as JoinExpressionBase;
 
-                    if (ReferenceEquals(updateExpression.Table, joinExpression?.Table ?? table))
+                    if (updateExpression.Table.Alias == (joinExpression?.Table.Alias ?? table.Alias))
                     {
                         LiftPredicate(table);
                         continue;

test/EFCore.PG.FunctionalTests/BulkUpdates/NonSharedModelBulkUpdatesNpgsqlTest.cs

@@ -50,12 +50,17 @@ DELETE FROM "Owner" AS o
 """);
     }
 
-    // TODO: #3253
     public override async Task Replace_ColumnExpression_in_column_setter(bool async)
     {
-        var exception = await Assert.ThrowsAsync<PostgresException>(() => base.Replace_ColumnExpression_in_column_setter(async));
+        await base.Replace_ColumnExpression_in_column_setter(async);
 
-        Assert.Equal("42712", exception.SqlState);
+        AssertSql(
+            """
+UPDATE "OwnedCollection" AS o0
+SET "Value" = 'SomeValue'
+FROM "Owner" AS o
+WHERE o."Id" = o0."OwnerId"
+""");
     }
 
     public override async Task Delete_aggregate_root_when_table_sharing_with_non_owned_throws(bool async)