From 63ef337475a266379c7208f52f827980e69d1d1b Mon Sep 17 00:00:00 2001
From: Nick Vatamaniuc <vatamane@apache.org>
Date: Thu, 2 Mar 2017 21:24:52 -0500
Subject: [PATCH] Fix `badarith` error in couch_db:get_db_info call

When folding we account for a previous `null`, `undefined`, or a number. However
btree:size/1 returns 0, `nil` or a number.

Switched `undefined` to `nil`. Couldn't find where btree:size would ever return
`undefined`, it seems we meant to use `nil` instead.

COUCHDB-3316
---
 src/couch_db.erl | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/couch_db.erl b/src/couch_db.erl
index 8005e6d6..d01a3e0c 100644
--- a/src/couch_db.erl
+++ b/src/couch_db.erl
@@ -391,7 +391,7 @@ active_size(#db{}=Db, #size_info{}=SI) ->
         case couch_btree:size(T) of
             _ when Acc == null ->
                 null;
-            undefined ->
+            nil ->
                 null;
             Size ->
                 Acc + Size