Horton

Re: Make COPY format extendable: Extract COPY TO format implementations

Sutou Kouhei <kou@clear-code.com>

View thread View on postgr.es
From: Sutou Kouhei <kou@clear-code.com>
To: sawada.mshk@gmail.com
Cc: michael@paquier.xyz, david.g.johnston@gmail.com, tgl@sss.pgh.pa.us, zhjwpku@gmail.com, pgsql-hackers@postgresql.org
Date: 2025-06-16T23:50:37Z
Lists: pgsql-hackers 
Hi,

In <CAD21AoBwxgfkMYxgPWyrLG-r8-ptVKjd=jhncY_QAaVJYhQQdw@mail.gmail.com>
  "Re: Make COPY format extendable: Extract COPY TO format implementations" on Thu, 12 Jun 2025 10:00:12 -0700,
  Masahiko Sawada <sawada.mshk@gmail.com> wrote:

>> So, my opinion is to rely on _PG_init(), with a shared ID if you want
>> to expose the method used somewhere for monitoring tools.  You could
>> as well implement the simpler set of APIs that allocates IDs local to
>> each backend, like EXPLAIN, then consider later if shared IDs are
>> really needed.  The registration APIs don't have to be fixed in time
>> across releases, they can be always improved in steps as required.
>> What matters is ABI compatibility in the same major version once it is
>> released.
> 
> +1 to start with a simpler set of APIs.

OK. I'll implement the initial version with this
design. (Allocating IDs local not shared.)


Thanks,
-- 
kou

Commits

  1. Refactor Copy{From|To}GetRoutine() to use pass-by-reference argument.

  2. Refactor COPY FROM to use format callback functions.

  3. Refactor COPY TO to use format callback functions.

  4. Another try to fix BF failure introduced in commit ddd5f4f54a.

  5. Revert "Refactor CopyReadAttributes{CSV,Text}() to use a callback in COPY FROM"

  6. Improve COPY TO performance when server and client encodings match

  7. Simplify signature of CopyAttributeOutCSV() in copyto.c

  8. Revert "Refactor CopyAttributeOut{CSV,Text}() to use a callback in COPY TO"

  9. Refactor CopyAttributeOut{CSV,Text}() to use a callback in COPY TO

  10. Refactor CopyReadAttributes{CSV,Text}() to use a callback in COPY FROM

  11. Add progress reporting of skipped tuples during COPY FROM.

  12. pgbench: Add \syncpipeline

  13. meson: Make gzip and tar optional

  14. Export the external file reader used in COPY FROM as APIs.