Re: Use read streams in pg_visibility

Hi,

On Tue, 3 Sept 2024 at 22:20, Noah Misch <noah@leadboat.com> wrote:
>
> On Tue, Sep 03, 2024 at 10:50:11AM -0700, Noah Misch wrote:
> > On Mon, Sep 02, 2024 at 03:20:12PM +0300, Nazir Bilal Yavuz wrote:
> > > Thanks, updated patches are attached.
> >
> > > +/*
> > > + * Ask the callback which block it would like us to read next, with a small
> > > + * buffer in front to allow read_stream_unget_block() to work and to allow the
> > > + * fast path to skip this function and work directly from the array.
> > >   */
> > >  static inline BlockNumber
> > >  read_stream_get_block(ReadStream *stream, void *per_buffer_data)
> >
> > v4-0001-Add-general-use-struct-and-callback-to-read-strea.patch introduced
> > this update to the read_stream_get_block() header comment, but we're not
> > changing read_stream_get_block() here.  I reverted this.

Sorry, it should be left from rebase. Thanks for reverting it.

> > Pushed with some other cosmetic changes.

Thanks!

> I see I pushed something unacceptable under ASAN.  I will look into that:
> https://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=grassquit&dt=2024-09-03%2017%3A47%3A20

I think it is related to the scope of BlockRangeReadStreamPrivate in
the collect_visibility_data() function. Attached a small fix for that.

-- 
Regards,
Nazir Bilal Yavuz
Microsoft