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help / color / mirror / Atom feedFrom: jian he <[email protected]>
To: Kirill Reshke <[email protected]>
Cc: PostgreSQL-development <[email protected]>
Cc: Tom Lane <[email protected]>
Cc: Michael Paquier <[email protected]>
Subject: Re: in BeginCopyTo make materialized view using COPY TO instead of COPY (query).
Date: Sat, 29 Mar 2025 14:46:37 +0800
Message-ID: <CACJufxE35HxSMqG6su0txZwOLpbnBsDBav5eigxt6L8Nk8bJwQ@mail.gmail.com> (raw)
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References: <CACJufxHVxnyRYy67hiPePNCPwVBMzhTQ6FaL9_Te5On9udG=yg@mail.gmail.com>
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On Thu, Mar 27, 2025 at 3:04 AM Kirill Reshke <[email protected]> wrote:
> >
> > hi.
> > patch attached.
> > also cc to Tom,
> > since at that time, you are against the idea of ``COPY matview TO``.
>
> Hi! With this patch it is possible to COPY matview TO, but not regular
> view, which is surprising. Let's fix that?
create view v1 as select 1;
copy v1 to stdout;
if you specifying table name, not query, then
{
cstate = BeginCopyTo(pstate, rel, query, relid,
stmt->filename, stmt->is_program,
NULL, stmt->attlist, stmt->options);
*processed = DoCopyTo(cstate); /* copy from database to file *
}
will use {table_beginscan, table_scan_getnextslot, table_endscan}
to output the data.
but views don't have storage, table_beginscan mechanism won't work.
so i don't think this is possible for view.
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To: [email protected]
Cc: [email protected], [email protected], [email protected], [email protected]
Subject: Re: in BeginCopyTo make materialized view using COPY TO instead of COPY (query).
In-Reply-To: <CACJufxE35HxSMqG6su0txZwOLpbnBsDBav5eigxt6L8Nk8bJwQ@mail.gmail.com>
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