Horton

Re: Should we add xid_current() or a int8->xid cast?

Andres Freund <andres@anarazel.de>

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From: Andres Freund <andres@anarazel.de>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Thomas Munro <thomas.munro@gmail.com>, pgsql-hackers <pgsql-hackers@postgresql.org>
Date: 2019-07-25T00:40:14Z
Lists: pgsql-hackers 
Hi,

On 2019-07-24 20:34:39 -0400, Tom Lane wrote:
> Yeah, I would absolutely NOT recommend that you open that can of worms
> right now.  We have looked at adding unsigned integer types in the past
> and it looked like a mess.

I assume Thomas was thinking more of another bespoke type like xid, just
wider.  There's some notational advantage in not being able to
immediately do math etc on xids.

- Andres

Commits

  1. Introduce xid8-based functions to replace txid_XXX.

  2. Add SQL type xid8 to expose FullTransactionId to users.

  3. Replace the former method of determining snapshot xmax --- to wit, calling