The " row_filter " filters the rows and I don’t want to filter the row but only
one (or several) column(s).
Actually, I want a column value on the provider to be filtered on subcribers
when replicating.
For example, on provider :
a | b | c | d
-+--++--
123 | 45.6 | 15 | abc
111 | 55.5 | 66 | def
on subscriber :
a | b | c | d
-+--++--
123 | 45.6 | 15 | abc
111 | | 66 | def
-> b NULL on subscriber but the others columns are replicated.
De: "Fabrízio de Royes Mello"
À: "PALAYRET Jacques"
Cc: "Postgres General"
Envoyé: Vendredi 23 Octobre 2020 16:23:19
Objet: Re: Conditional column filtering with pglogical replication
Em sex., 23 de out. de 2020 às 10:35, PALAYRET Jacques < [
mailto:jacques.palay...@meteo.fr | jacques.palay...@meteo.fr ] > escreveu:
>
> With PgLogical extension, I have tested the possibility of column filtering
> (columns) and row filtering (row_filter).
> But is there a way to do a conditional column filtering ?
> I mean a way to filter a column based on a predicate, with pglogical (so the
> filtered values won’t arrive on subscribers).
> For example, with a replicated table t(a integer as Primary Key, b numeric, c
> integer, d text), I would like to filter the column b when c between 10 and
> 20.
>
Hello,
According to the documentation [1] the row_filter is a normal PostgreSQL
expression with the same limitations of CHECK constraints, so you can do
something like: row_filter := 'c between 10 and 20 and b = ?'
Regards,
[1] [ https://github.com/2ndQuadrant/pglogical#row-filtering |
https://github.com/2ndQuadrant/pglogical#row-filtering ]
--
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http://www.timbira.com.br/ ]
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