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: andres@anarazel.de, michael@paquier.xyz, david.g.johnston@gmail.com, tgl@sss.pgh.pa.us, zhjwpku@gmail.com, pgsql-hackers@postgresql.org
Date: 2025-10-14T02:15:24Z
Lists: pgsql-hackers

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Hi,

In <CAD21AoBkA=g=PN17r_iieru+vLyLtGZ8WvohgANa2vzsMfMogQ@mail.gmail.com>
  "Re: Make COPY format extendable: Extract COPY TO format implementations" on Mon, 13 Oct 2025 14:40:31 -0700,
  Masahiko Sawada <sawada.mshk@gmail.com> wrote:

> The patch refactors the CopyToStateData so that we can both hide
> internal-use-only fields from extensions and extension can use its own
> state data, while not adding extra indirection layers. TBH I'm really
> not sure we must fully hide internal fields from extensions. Other
> extendable components seem not to strictly hide internal information
> from extensions. I'd suggest starting with only the latter point. That
> is, we merge fields in CopyToStateInternalData to CopyToStateData.
> What do you think?

OK. Let's follow the existing style. How about the attached
patch? It merges CopyToStateInternalData to CopyToStateData.


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.