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: zhjwpku@gmail.com
Cc: sawada.mshk@gmail.com, michael@paquier.xyz, andrew@dunslane.net, nathandbossart@gmail.com, pgsql-hackers@postgresql.org
Date: 2024-01-15T06:23:50Z
Lists: pgsql-hackers 
Hi,

In <CAEG8a3J02NzGBxG1rP9C4u7qRLOqUjSOdy3q5_5v__fydS3XcA@mail.gmail.com>
  "Re: Make COPY format extendable: Extract COPY TO format implementations" on Fri, 12 Jan 2024 14:40:41 +0800,
  Junwang Zhao <zhjwpku@gmail.com> wrote:

>> Could you clarify what should we discuss? We should require
>> that COPY TO/FROM handlers should use PostgreSQL's memory
>> context for all internal memory allocations?
> 
> Yes, handlers should use PostgreSQL's memory context, and I think
> creating other memory context under CopyToStateData.copycontext
> should be suggested for handler creators, so I proposed exporting
> CopyToStateData to public header.

I see.

We can provide a getter for CopyToStateData::copycontext if
we don't want to export CopyToStateData. Note that I don't
have a strong opinion whether we should export
CopyToStateData or not.


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.