Re: Setting pd_lower in GIN metapage

Amit Langote <langote_amit_f8@lab.ntt.co.jp>

From: Amit Langote <Langote_Amit_f8@lab.ntt.co.jp>
To: Michael Paquier <michael.paquier@gmail.com>
Cc: Amit Kapila <amit.kapila16@gmail.com>, Tom Lane <tgl@sss.pgh.pa.us>, Masahiko Sawada <sawada.mshk@gmail.com>, Pg Hackers <pgsql-hackers@postgresql.org>
Date: 2017-09-12T10:21:23Z
Lists: pgsql-hackers

Attachments

On 2017/09/11 18:13, Michael Paquier wrote:
> On Mon, Sep 11, 2017 at 5:40 PM, Amit Langote wrote:
>> On 2017/09/10 15:22, Michael Paquier wrote:
>>> Coordinating efforts here would be nice. If you, Amit K, are taking
>>> care of a patch for btree and hash, would you, Amit L, write the part
>>> for GIN, BRIN and SpGist? This needs a careful lookup as many code
>>> paths need a lookup so it may take time. Please note that I don't mind
>>> double-checking this part if you don't have enough room to do so.
>>
>> Sorry, I didn't have time today to carefully go through the recent
>> discussion on this thread (starting with Tom's email wherein he said he
>> set the status of the patch to Waiting on Author).  I will try tomorrow.
> 
> Thanks for the update! Once you get to this point, please let me know
> if you would like to work on a more complete patch for brin, gin and
> spgist. If you don't have enough room, I am fine to produce something.

I updated the patches for GIN, BRIN, and SP-GiST to include the following
changes:

1. Pass REGBUF_STNADARD flag when registering the metapage buffer

2. Pass true for page_std argument of log_newpage() or
   log_newpage_buffer() when using it to log the metapage

3. Update comment near where pd_lower is set in the respective metapages,
   similar to what Amit K did in his patches for btree and hash metapages.

Did I miss something from the discussion?

Thanks,
Amit

Commits

  1. Flag index metapages as standard-format in xlog.c calls.

  2. Set the metapage's pd_lower correctly in brin, gin, and spgist indexes.