Horton

Re: generated columns

Nico Williams <nico@cryptonector.com>

View thread View on postgr.es
From: Nico Williams <nico@cryptonector.com>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Adam Brusselback <adambrusselback@gmail.com>, pgsql-hackers <pgsql-hackers@postgresql.org>
Date: 2017-10-02T18:46:42Z
Lists: pgsql-hackers 
On Mon, Oct 02, 2017 at 02:30:38PM -0400, Tom Lane wrote:
> Nico Williams <nico@cryptonector.com> writes:
> > On Mon, Oct 02, 2017 at 12:50:14PM -0400, Adam Brusselback wrote:
> >> So for me, i'd rather default to compute on read, as long storing the
> >> pre-computed value is an option when necessary.
> 
> > Sure, I agree.  I was just wondering whether there might be any other
> > difference besides performance characteristics.  The answer to that is,
> > I think, "no".
> 
> What about non-immutable functions in the generation expression?

Aha, thanks!  Yes, that would be noticeable.

Nico
--

Commits

  1. Generated columns

  2. Add walreceiver API to get remote server version

  3. Add pg_partition_tree to display information about partitions

  4. pg_restore: Augment documentation for -N option

  5. Change delimiter used for display of NextXID