Horton

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

Sutou Kouhei <kou@clear-code.com>

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From: Sutou Kouhei <kou@clear-code.com>
To: sawada.mshk@gmail.com
Cc: tomas@vondra.me, andres@anarazel.de, michael@paquier.xyz, david.g.johnston@gmail.com, tgl@sss.pgh.pa.us, zhjwpku@gmail.com, pgsql-hackers@postgresql.org
Date: 2026-03-27T01:36:40Z
Lists: pgsql-hackers 
Hi,

In <CAD21AoCLxUhQ0uBjDKXvCEtJBCfF13Ru_7u-Qrrsu+0PPUqcPQ@mail.gmail.com>
  "Re: Make COPY format extendable: Extract COPY TO format implementations" on Thu, 18 Dec 2025 15:43:07 -0800,
  Masahiko Sawada <sawada.mshk@gmail.com> wrote:

> Looking at these results, it seems that 0001-from-binary cases and
> 0006-to-binary cases are slower throughout the six results?

Good point. I didn't notice them. But I feel that it's not
related to the patch set. Because 0001 doesn't change COPY
FROM related code. 0001 just changes COPY TO related
code. And 0006 just adds tests. 0006 doesn't change
implementations.


BTW, how to proceed this proposal? It seems that we can't
proceed this proposal without PostgreSQL committers'
attentions but it seems that it's difficult.


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.