Looking at this patch, I don't see what we actually gain much here except a decoder plugin that speaks a special protocol for a special background worker that has not been presented yet. What actually is the value of that defined as a contrib/ module in-core. Note that we have already test_decoding to basically test the logical decoding facility, used at least at the SQL level to get logical changes decoded.
Based on those reasons I am planning to mark this as rejected (it has no documentation as well). So please speak up if you think the contrary, but it seems to me that this could live happily out of core.
I think you are missing point of this, it's not meant to be committed in this form at all and even less as contrib module. It was meant as basis for in-core logical replication discussion, but sadly I didn't really have time to pursue it in this CF in the end.
That being said and looking at the size of February CF, I think I am fine with dropping this in 9.5 cycle, it does not seem likely that there will be anything useful done with this fast enough to get to 9.5 so there is no point in spending committer resources on it in final CF.
I will pick it up again after the CF is done.
OK, thanks for the clarifications. Note that I am marking it as "rejected" in CF 2014-12 not because it is something that is not wanted, but just not to re-add it to CF 2015-02 which is what "returned with feedback" actually does... --