Github user hdiedrich commented on the pull request:
https://github.com/apache/couchdb-couch/pull/54#issuecomment-106030561
I mean the `#btree`'s `reduce` field that is used in `couch_btree.erl`
```Erlang
full_reduce(#btree{root=nil,reduce=Reduce}) ->
{ok, Reduce(reduce, [])};
full_reduce(#btree{root=Root}) ->
{ok, element(2, Root)}.
```
and ultimately produces the tuple `{AS, ES}` at the heart of this PR, which
could be in `SizeInfo0`, via
```Erlang
{ok, DbReduction} = couch_btree:full_reduce(IdBtree),
SizeInfo0 = element(3, DbReduction),
```
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