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: michael@paquier.xyz
Cc: andres@anarazel.de, sawada.mshk@gmail.com, zhjwpku@gmail.com, andrew@dunslane.net, nathandbossart@gmail.com, pgsql-hackers@postgresql.org
Date: 2024-02-15T06:34:21Z
Lists: pgsql-hackers

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Hi,

In <ZcxjNDtqNLvdz0f5@paquier.xyz>
  "Re: Make COPY format extendable: Extract COPY TO format implementations" on Wed, 14 Feb 2024 15:52:36 +0900,
  Michael Paquier <michael@paquier.xyz> wrote:

>> How about InputFunctionCallSafeWithInfo(),
>> InputFunctionCallSafeInfo() or
>> InputFunctionCallInfoCallSafe()?
> 
> WithInfo() would not be a new thing.  There are a couple of APIs named
> like this when manipulating catalogs, so that sounds kind of a good
> choice from here.

Thanks for the info. Let's use InputFunctionCallSafeWithInfo().
See that attached patch:
v2-0001-Reuse-fcinfo-used-in-COPY-FROM.patch

I also attach a patch for COPY TO:
v1-0001-Reuse-fcinfo-used-in-COPY-TO.patch

I measured the COPY TO patch on my environment with:
COPY (SELECT 1::int2,2::int2,3::int2,4::int2,5::int2,6::int2,7::int2,8::int2,9::int2,10::int2,11::int2,12::int2,13::int2,14::int2,15::int2,16::int2,17::int2,18::int2,19::int2,20::int2, generate_series(1, 1000000::int4)) TO '/dev/null' \watch c=5

master:
740.066ms
734.884ms
738.579ms
734.170ms
727.953ms

patched:
730.714ms
741.483ms
714.149ms
715.436ms
713.578ms

It seems that it improves performance a bit but my
environment isn't suitable for benchmark. So they may not
be valid numbers.


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.