Re: logical replication empty transactions

I've rebased the patch and made changes so that the patch supports "streaming in-progress transactions" and handling of logical decoding

messages (transactional and non-transactional).

I see that this patch not only makes sure that empty transactions are not sent but also does call OutputPluginUpdateProgress when an empty

transaction is not sent, as a result the confirmed_flush_lsn is kept moving. I also see no hangs when synchronous_standby is configured.

Do let me know your thoughts on this patch.