diff --git a/Examples/base_entity/Program.cs b/Examples/base_entity/Program.cs
index ab4f15a69..6e06396d5 100644
--- a/Examples/base_entity/Program.cs
+++ b/Examples/base_entity/Program.cs
@@ -13,6 +13,7 @@ using NetTopologySuite.Geometries;
 using Newtonsoft.Json;
 using Newtonsoft.Json.Linq;
 using Npgsql;
+using Org.BouncyCastle.Tls;
 using System;
 using System.Collections;
 using System.Collections.Concurrent;
@@ -620,6 +621,18 @@ namespace base_entity
             BaseEntity.Initialization(fsql, () => _asyncUow.Value);
             #endregion
 
+            var sql20250205 = fsql.Select<OrderLine, Product>()
+                .InnerJoin((l, p) => l.ProductId == p.ID)
+                .GroupBy((l, p) => new { p.ID, ShopType = l.ShopType ?? 0 })
+                .ToSql(x => new
+                {
+                    TradeId = x.Key.ID,
+                    ShopType = x.Key.ShopType,
+                    FieldCount = x.CountDistinct(x.Value.Item2.ID),
+                    Count = x.Count(x.Value.Item1.Id),
+                    Kb = (long)x.Sum(x.Value.Item1.Amount)
+                });
+
             var res = fsql.Select<MemberActionDayCountModel>()
                 .Where(x => x.Date >= 20230101 && x.Date < 20240101 && x.ScanCode > 0)
                 .Where(x =>
@@ -3510,4 +3523,14 @@ public sealed class MemberActionDayCountModel
     /// </summary>
     public decimal ScanCodeAmount { get; set; }
     #endregion
+}
+[ExpressionCall]
+public static class ExpressionCallExtesions
+{
+    static ThreadLocal<ExpressionCallContext> context = new ThreadLocal<ExpressionCallContext>();
+    public static int CountDistinct<TKey, TValue>(this ISelectGroupingAggregate<TKey, TValue> that, object column)
+    {
+        context.Value.Result = $"count(distinct {context.Value.ParsedContent["column"]})";
+        return 0;
+    }
 }
\ No newline at end of file
diff --git a/FreeSql/Internal/CommonExpression.cs b/FreeSql/Internal/CommonExpression.cs
index 3f2e98b40..d193663b2 100644
--- a/FreeSql/Internal/CommonExpression.cs
+++ b/FreeSql/Internal/CommonExpression.cs
@@ -2055,6 +2055,7 @@ namespace FreeSql.Internal
                         {
                             var expStackFirst = expStack.First() as ParameterExpression;
                             var bidx = expStackFirst.Type.FullName.StartsWith("FreeSql.ISelectGroupingAggregate`") ? 2 : 1; //.Key .Value
+                            if (bidx == 2 && expStack.Count == 1) return ""; //不解析
                             var diyexpMembers = expStack.Where((a, b) => b >= bidx).ToArray();
                             if (diyexpMembers.Any() == false && diymemexp != null && diymemexp is Select0Provider.WithTempQueryParser tempQueryParser && tempQueryParser.GetOutsideSelectTable(expStackFirst) != null)
                                 diyexpMembers = expStack.ToArray();