| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Robert Haas <robertmhaas(at)gmail(dot)com> |
| Cc: | Jim Nasby <decibel(at)decibel(dot)org>, Greg Sabino Mullane <greg(at)turnstep(dot)com>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: global temporary tables |
| Date: | 2010-04-25 03:02:42 |
| Message-ID: | 19874.1272164562@sss.pgh.pa.us |
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| Lists: | pgsql-hackers |
Robert Haas <robertmhaas(at)gmail(dot)com> writes:
> Pushing it into the RelFileNode has some advantages in terms of being
> able to get at the information from everywhere, but one thing that
> makes me think that's probably not a good decision is that we somtimes
> WAL-log relfilenodes. And WAL-logging the value of the isTemp flag is
> a waste, because if we're WAL-logging, it's zero.
Yeah. I think we also use RelFileNode as a hash tag in places, and
so adding a bool to it would be problematic for a couple of reasons:
possibly uninitialized pad bytes, and uselessly incorporating more bytes
into the hash calculation.
regards, tom lane
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