From 83dc4a433c2256314906ba484f87d7d0581e3195 Mon Sep 17 00:00:00 2001
From: Danny B <danny.b.eml@gmail.com>
Date: Wed, 7 Aug 2013 15:27:29 +1100
Subject: [PATCH] Make max_, min_ and sum_ less general.

---
 src/Database/Esqueleto/Internal/Language.hs | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/Database/Esqueleto/Internal/Language.hs b/src/Database/Esqueleto/Internal/Language.hs
index f0d0c1a..72e33fa 100644
--- a/src/Database/Esqueleto/Internal/Language.hs
+++ b/src/Database/Esqueleto/Internal/Language.hs
@@ -236,9 +236,9 @@ class (Functor query, Applicative query, Monad query) =>
   round_   :: (PersistField a, PersistField b) => expr (Value a) -> expr (Value b)
   ceiling_ :: (PersistField a, PersistField b) => expr (Value a) -> expr (Value b)
   floor_   :: (PersistField a, PersistField b) => expr (Value a) -> expr (Value b)
-  sum_     :: (PersistField a, PersistField b) => expr (Value a) -> expr (Value b)
-  min_     :: (PersistField a, PersistField b) => expr (Value a) -> expr (Value b)
-  max_     :: (PersistField a, PersistField b) => expr (Value a) -> expr (Value b)
+  sum_     :: (PersistField a) => expr (Value a) -> expr (Value a)
+  min_     :: (PersistField a) => expr (Value a) -> expr (Value a)
+  max_     :: (PersistField a) => expr (Value a) -> expr (Value a)
   avg_     :: (PersistField a, PersistField b) => expr (Value a) -> expr (Value b)
 
   -- | @LIKE@ operator.