Do not suppress old revisions from _changes

Requests to '_changes?style=all_docs' with a 'since' parameter would
suppress revisions of a document generated before the start of the
feed.  The assumption may have been that those revisions were seen by
the client in a previous request to _changes, but this is not
necessarily true if the client is resuming the feed after a partial
download.

The safe thing to do is to include all leaf revisions for each document
in the feed.

Thanks Bob Dionne for the test code.

Closes COUCHDB-1256

git-svn-id: https://svn.apache.org/repos/asf/couchdb/branches/1.1.x@1161702 13f79535-47bb-0310-9956-ffa450edef68

1 files changed, 2 insertions, 14 deletions

diff --git a/src/couchdb/couch_db.erl b/src/couchdb/couch_db.erl
index f919c72c..3d8395f4 100644
--- a/src/couchdb/couch_db.erl
+++ b/src/couchdb/couch_db.erl
@@ -947,20 +947,8 @@ enum_docs_reduce_to_count(Reds) ->
 changes_since(Db, Style, StartSeq, Fun, Acc) ->
     changes_since(Db, Style, StartSeq, Fun, [], Acc).
     
-changes_since(Db, Style, StartSeq, Fun, Options, Acc) ->
-    Wrapper = fun(DocInfo, _Offset, Acc2) ->
-            #doc_info{revs=Revs} = DocInfo,
-            DocInfo2 =
-            case Style of
-            main_only ->
-                DocInfo;
-            all_docs ->
-                % remove revs before the seq
-                DocInfo#doc_info{revs=[RevInfo ||
-                    #rev_info{seq=RevSeq}=RevInfo <- Revs, StartSeq < RevSeq]}
-            end,
-            Fun(DocInfo2, Acc2)
-        end,
+changes_since(Db, _Style, StartSeq, Fun, Options, Acc) ->
+    Wrapper = fun(DocInfo, _Offset, Acc2) -> Fun(DocInfo, Acc2) end,
     {ok, _LastReduction, AccOut} = couch_btree:fold(Db#db.docinfo_by_seq_btree,
         Wrapper, Acc, [{start_key, StartSeq + 1}] ++ Options),
     {ok, AccOut}.