From 49d9d92a4cec9c3983118ab6e9d298311edf7940 Mon Sep 17 00:00:00 2001
From: David Lebee <david@poweredsoft.com>
Date: Sun, 21 Oct 2018 16:15:59 -0500
Subject: [PATCH] Empty group to create easy totals

---
 .../Extensions/QueryableExtensions.cs                 | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/PoweredSoft.DynamicLinq/Extensions/QueryableExtensions.cs b/PoweredSoft.DynamicLinq/Extensions/QueryableExtensions.cs
index 1780a6e..b824143 100644
--- a/PoweredSoft.DynamicLinq/Extensions/QueryableExtensions.cs
+++ b/PoweredSoft.DynamicLinq/Extensions/QueryableExtensions.cs
@@ -157,5 +157,16 @@ namespace PoweredSoft.DynamicLinq
             var result = method.Invoke(null, new object[] {query});
             return (long) result;
         }
+
+        public static IQueryable EmptyGroupBy(this IQueryable queryable, Type underlyingType)
+        {
+            var parameter = Expression.Parameter(underlyingType);
+            var genericMethod = Constants.GroupByMethod.MakeGenericMethod(underlyingType, typeof(bool));
+            var trueConstant = Expression.Constant(true);
+            var lambda = Expression.Lambda(trueConstant, parameter);
+            var groupByExpression = Expression.Call(genericMethod, queryable.Expression, lambda);
+            var result = queryable.Provider.CreateQuery(groupByExpression);
+            return result;
+        }
     }
 }