| From: | Dilip Kumar <dilipbalaut(at)gmail(dot)com> |
|---|---|
| To: | Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> |
| Cc: | Tomas Vondra <tomas(dot)vondra(at)enterprisedb(dot)com>, Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org>, Greg Nancarrow <gregn4422(at)gmail(dot)com>, Euler Taveira <euler(at)eulerto(dot)com>, Peter Smith <smithpb2250(at)gmail(dot)com>, Rahila Syed <rahilasyed90(at)gmail(dot)com>, Peter Eisentraut <peter(dot)eisentraut(at)enterprisedb(dot)com>, Önder Kalacı <onderkalaci(at)gmail(dot)com>, japin <japinli(at)hotmail(dot)com>, Michael Paquier <michael(at)paquier(dot)xyz>, David Steele <david(at)pgmasters(dot)net>, Craig Ringer <craig(at)2ndquadrant(dot)com>, Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com>, Amit Langote <amitlangote09(at)gmail(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org> |
| Subject: | Re: row filtering for logical replication |
| Date: | 2021-07-20 09:48:53 |
| Message-ID: | CAFiTN-teMxRqxyDzi07nF9-QotMy-NuAUtkFAa0NrD_8DRLiyA@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Tue, Jul 20, 2021 at 3:12 PM Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> wrote:
>
> > > Why? I think it would just need similar restrictions as we are
> > > planning for Delete operation such that filter columns must be either
> > > present in primary or replica identity columns.
> > >
> >
> > How else would you turn UPDATE to INSERT? For UPDATE we only send the
> > identity columns and modified columns, and the decision happens on the
> > subscriber.
> >
>
> Hmm, we log the entire new tuple and replica identity columns for the
> old tuple in WAL for Update. And, we are going to use a new tuple for
> Insert, so we have everything we need.
>
But for making that decision we need to apply the filter on the old
rows as well right. So if we want to apply the filter on the old rows
then either the filter should only be on the replica identity key or
we need to use REPLICA IDENTITY FULL. I think that is what Tomas
wants to point out.
--
Regards,
Dilip Kumar
EnterpriseDB: http://www.enterprisedb.com
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