Github user iilyak commented on the issue:
https://github.com/apache/couchdb-fabric/pull/54
We pass Args as a whole to `handle_message/3` in `#collector.query_args`
field. We also pass Args to `fabric_rpc:reduce_view/3` earlier. So the
`direction` parameter get passed down the chain:
* `fabric_rpc:reduce_view/3`
* `couch_mrview:query_view/6`
* `couch_mrview:red_fold/5`
`couch_mrview:red_fold/5` uses
[`couch_mrview_util:key_opts/2`](https://github.com/apache/couchdb-couch-mrview/blob/master/src/couch_mrview.erl#L563).
Which reorders `start_key`/`end_key` depending on `direction`.
I think `direction=Dir` was added for debugging and was not removed before
submitting PR.
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