From ecb067ba1a2b32a1d6a5a210d496664adedd55ce Mon Sep 17 00:00:00 2001
From: "Paul J. Davis" <paul.joseph.davis@gmail.com>
Date: Tue, 29 Sep 2020 09:56:19 -0500
Subject: Use JSON collation

---
 src/couch_views/src/couch_views_reduce_fdb.erl | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/couch_views/src/couch_views_reduce_fdb.erl b/src/couch_views/src/couch_views_reduce_fdb.erl
index a5cb90568..8ea206174 100644
--- a/src/couch_views/src/couch_views_reduce_fdb.erl
+++ b/src/couch_views/src/couch_views_reduce_fdb.erl
@@ -193,11 +193,18 @@ open_tree(TxDb, Sig, ViewId, ViewReduceFun) ->
 
     TreeOpts = [
         {reduce_fun, get_reducer(ViewReduceFun)},
+        {collate_fun, fun less_json_rows/2},
         {encode_fun, EncodeFun}
     ],
     ebtree:open(Tx, ReduceIdxPrefix, btree_order_size(), TreeOpts).
 
 
+less_json_rows({_, _} = A, {_, _} = B) ->
+    couch_ejson_compare:less_json_ids(A, B);
+less_json_rows(A, B) ->
+    couch_ejson_compare:less_json(A, B).
+
+
 delete_keys(Tx, Tree, DocId, Keys) ->
     lists:foreach(fun (Key) ->
         EK = create_key(Key, DocId),
-- 
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