- 优化 ToAggregate 执行时忽略已设置的 OrderBy；

FreeSql/Internal/CommonProvider/SelectProvider/Select0ProviderReader.cs

@@ -710,6 +710,10 @@ namespace FreeSql.Internal.CommonProvider
         }
 
         protected TReturn InternalToAggregate<TReturn>(Expression select)
+        {
+            var tmpOrderBy = _orderby;
+            _orderby = null; //解决 select count(1) from t order by id 这样的 SQL 错误
+            try
             {
                 var map = new ReadAnonymousTypeInfo();
                 var field = new StringBuilder();
@@ -718,6 +722,11 @@ namespace FreeSql.Internal.CommonProvider
                 _commonExpression.ReadAnonymousField(_tables, field, map, ref index, select, null, null, _whereCascadeExpression, null, false); //不走 DTO 映射，不处理 IncludeMany
                 return this.ToListMapReader<TReturn>(new ReadAnonymousTypeAfInfo(map, field.Length > 0 ? field.Remove(0, 2).ToString() : null)).FirstOrDefault();
             }
+            finally
+            {
+                _orderby = tmpOrderBy;
+            }
+        }
 
         public TSelect InternalWhere(Expression exp) => exp == null ? this as TSelect : this.Where(_commonExpression.ExpressionWhereLambda(_tables, exp, null, _whereCascadeExpression, _params));
 
@@ -966,6 +975,10 @@ namespace FreeSql.Internal.CommonProvider
         }
 
         async protected Task<TReturn> InternalToAggregateAsync<TReturn>(Expression select)
+        {
+            var tmpOrderBy = _orderby;
+            _orderby = null; //解决 select count(1) from t order by id 这样的 SQL 错误
+            try
             {
                 var map = new ReadAnonymousTypeInfo();
                 var field = new StringBuilder();
@@ -974,6 +987,11 @@ namespace FreeSql.Internal.CommonProvider
                 _commonExpression.ReadAnonymousField(_tables, field, map, ref index, select, null, null, _whereCascadeExpression, null, false); //不走 DTO 映射，不处理 IncludeMany
                 return (await this.ToListMapReaderAsync<TReturn>(new ReadAnonymousTypeAfInfo(map, field.Length > 0 ? field.Remove(0, 2).ToString() : null))).FirstOrDefault();
             }
+            finally
+            {
+                _orderby = tmpOrderBy;
+            }
+        }
 #endif
         #endregion
     }