Horton

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

Junwang Zhao <zhjwpku@gmail.com>

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From: Junwang Zhao <zhjwpku@gmail.com>
To: Daniel Verite <daniel@manitou-mail.org>
Cc: Sutou Kouhei <kou@clear-code.com>, pgsql-hackers@postgresql.org
Date: 2023-12-06T14:32:14Z
Lists: pgsql-hackers 
On Wed, Dec 6, 2023 at 8:32 PM Daniel Verite <daniel@manitou-mail.org> wrote:
>
>         Sutou Kouhei wrote:
>
> > * 2022-04: Apache Arrow [2]
> > * 2018-02: Apache Avro, Apache Parquet and Apache ORC [3]
> >
> > (FYI: I want to add support for Apache Arrow.)
> >
> > There were discussions how to add support for more formats. [3][4]
> > In these discussions, we got a consensus about making COPY
> > format extendable.
>
>
> These formats seem all column-oriented whereas COPY is row-oriented
> at the protocol level [1].
> With regard to the procotol, how would it work to support these formats?
>

They have kind of *RowGroup* concepts, a bunch of rows goes to a RowBatch
and the data of the same column goes together.

I think they should fit the COPY semantics and there are some  FDW out there for
these modern formats, like [1]. If we support COPY to deal with the
format, it will
be easier to interact with them(without creating
server/usermapping/foreign table).

[1]: https://github.com/adjust/parquet_fdw

>
> [1] https://www.postgresql.org/docs/current/protocol-flow.html#PROTOCOL-COPY
>
>
> Best regards,
> --
> Daniel Vérité
> https://postgresql.verite.pro/
> Twitter: @DanielVerite
>
>


-- 
Regards
Junwang Zhao

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.