Re: Wanted: jsonb on-disk representation documentation

From: Michael Paquier <michael(dot)paquier(at)gmail(dot)com>
To: Heikki Linnakangas <hlinnakangas(at)vmware(dot)com>
Cc: Peter Geoghegan <pg(at)heroku(dot)com>, Andres Freund <andres(at)anarazel(dot)de>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Wanted: jsonb on-disk representation documentation
Date: 2014-05-07 11:32:37
Message-ID: CAB7nPqQBJHUpebuLTD4kkaPazkGk2o1k4V9hiaop8EW43sEB2A@mail.gmail.com
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On Wed, May 7, 2014 at 8:20 PM, Heikki Linnakangas
<hlinnakangas(at)vmware(dot)com> wrote:
> So, apart from cleaning up the code, we really need to take a close look at
> the on-disk format now. The code can be cleaned up later, too, but we're
> going to be stuck with the on-disk format forever, so it's critical to get
> that right.
>
> First, a few observations:
>
> * JENTRY_ISFIRST is redundant. Whenever you deal with the Jentry struct, you
> know from the context which element in the array it is.
>
> * JENTRY_ISNEST is set but never used.
>
> * JENTRY_ISBOOL is defined as (JENTRY_ISNUMERIC | JENTRY_ISNEST), which
> seems confusing.
>
> I'm going to proceed refactoring those things, which will change the on-disk
> format. It's late in the release cycle - these things really should've been
> cleaned up earlier - but it's important to get the on-disk format right.
> Shout if you have any objections.
+1. It is saner to do that now than never.
--
Michael

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