Re: POC: Lock updated tuples in tuple_update() and tuple_delete() - Mailing list pgsql-hackers

Hi,

On 2023-04-02 03:37:19 +0300, Alexander Korotkov wrote:
> On Sat, Apr 1, 2023 at 8:21 AM Andres Freund <andres@anarazel.de> wrote:
> > Given that the in-tree state has been broken for a week, I think it probably
> > is time to revert the commits that already went in.
> 
> The revised patch is attached.  The most notable change is getting rid
> of LazyTupleTableSlot.  Also get rid of complex computations to detect
> how to initialize LazyTupleTableSlot.  Instead just pass the oldSlot
> as an argument of ExecUpdate() and ExecDelete().  The price for this
> is just preallocation of ri_oldTupleSlot before calling ExecDelete().
> The slot allocation is quite cheap.  After all wrappers it's
> table_slot_callbacks(), which is very cheap, single palloc() and few
> fields initialization.  It doesn't seem reasonable to introduce an
> infrastructure to evade this.
> 
> I think patch resolves all the major issues you've highlighted.  Even
> if there are some minor things missed, I'd prefer to push this rather
> than reverting the whole work.

Shrug. You're designing new APIs, days before the feature freeze. This just
doesn't seem ready in time for 16. I certainly won't have time to look at it
sufficiently in the next 5 days.

Greetings,

Andres Freund