Re: [PATCH] Compression dictionaries for JSONB

Hi hackers,

> OK, I see your point now. And I think this is a very good point.
> Basing "Compression dictionaries" on the API provided by "pluggable
> TOASTer" can also be less hacky than what I'm currently doing with
> `typmod` argument. I'm going to switch the implementation at some
> point, unless anyone will object to the idea.

Here is the rebased patch. I reworked the memory management a bit but
other than that there are no new changes.

So far we seem to have a consensus to:

1. Use bytea instead of NameData to store dictionary entries;

2. Assign monotonically ascending IDs to the entries instead of using
Oids, as it is done with pg_class.relnatts. In order to do this we
should either add a corresponding column to pg_type, or add a new
catalog table, e.g. pg_dict_meta. Personally I don't have a strong
opinion on what is better. Thoughts?

Both changes should be straightforward to implement and also are a
good exercise to newcomers.

I invite anyone interested to join this effort as a co-author! (since,
honestly, rewriting the same feature over and over again alone is
quite boring :D).

--
Best regards,
Aleksander Alekseev