From f3457b227060940591ffb13868d218a4f4903ee6 Mon Sep 17 00:00:00 2001
From: Adam Kocoloski <adam@cloudant.com>
Date: Thu, 23 Dec 2010 00:07:41 -0500
Subject: Handle empty result set correctly in _stats

BugzID: 11498
---
 apps/couch/src/couch_query_servers.erl | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/apps/couch/src/couch_query_servers.erl b/apps/couch/src/couch_query_servers.erl
index 4e86dcf4..58540660 100644
--- a/apps/couch/src/couch_query_servers.erl
+++ b/apps/couch/src/couch_query_servers.erl
@@ -143,6 +143,9 @@ builtin_sum_rows(KVs) ->
             throw({invalid_value, <<"builtin _sum function requires map values to be numbers">>})
     end, 0, KVs).
 
+builtin_stats(_, []) ->
+    {[{sum,0}, {count,0}, {min,0}, {max,0}, {sumsqr,0}]};
+
 builtin_stats(reduce, [[_,First]|Rest]) when is_number(First) ->
     Stats = lists:foldl(fun([_K,V], {S,C,Mi,Ma,Sq}) when is_number(V) ->
         {S+V, C+1, erlang:min(Mi,V), erlang:max(Ma,V), Sq+(V*V)};
-- 
cgit v1.2.3