From: | Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org> |
---|---|
To: | Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> |
Cc: | Justin Pryzby <pryzby(at)telsasoft(dot)com>, Tomas Vondra <tomas(dot)vondra(at)enterprisedb(dot)com>, Peter Eisentraut <peter(dot)eisentraut(at)enterprisedb(dot)com>, "houzj(dot)fnst(at)fujitsu(dot)com" <houzj(dot)fnst(at)fujitsu(dot)com>, Rahila Syed <rahilasyed90(at)gmail(dot)com>, Peter Smith <smithpb2250(at)gmail(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: Column Filtering in Logical Replication |
Date: | 2022-01-06 12:22:54 |
Message-ID: | 202201061222.2xphgufwsf23@alvherre.pgsql |
Views: | Raw Message | Whole Thread | Download mbox | Resend email |
Thread: | |
Lists: | pgsql-hackers |
On 2022-Jan-06, Amit Kapila wrote:
> On Mon, Jan 3, 2022 at 8:01 PM Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org> wrote:
> >
>
> fetch_remote_table_info()
> {
> ..
> + appendStringInfo(&cmd,
> + " SELECT pg_catalog.unnest(prattrs)\n"
> + " FROM pg_catalog.pg_publication p JOIN\n"
> + " pg_catalog.pg_publication_rel pr ON (p.oid = pr.prpubid)\n"
> + " WHERE p.pubname IN (%s) AND\n",
> + publications.data);
> + if (!am_partition)
> + appendStringInfo(&cmd, "prrelid = %u", lrel->remoteid);
> + else
> + appendStringInfo(&cmd,
> + "prrelid IN (SELECT relid\n"
> + " FROM pg_catalog.pg_partition_tree(pg_catalog.pg_partition_root(%u)))",
> + lrel->remoteid);
>
> IIUC, this doesn't deal with cases when some publication has not
> specified table attrs. In those cases, I think it should return all
> attrs?
Hmm, no, the idea here is that the list of columns should be null; the
code that uses this result is supposed to handle a null result to mean
hat all columns are included.
> Also, it is not very clear to me what exactly we want to do
> with partitions?
... Hmm, maybe there is a gap in testing here, I'll check; but the idea
is that we would use the column list of the most immediate ancestor that
has one, if the partition itself doesn't have one. (I see we're missing
a check for "pubviaroot", which should represent an override. Need more
tests here.)
--
Álvaro Herrera PostgreSQL Developer — https://www.EnterpriseDB.com/
"Uno puede defenderse de los ataques; contra los elogios se esta indefenso"
From | Date | Subject | |
---|---|---|---|
Next Message | Alvaro Herrera | 2022-01-06 12:29:31 | Re: Column Filtering in Logical Replication |
Previous Message | Peter Smith | 2022-01-06 12:10:07 | Re: row filtering for logical replication |