Re: COPY TO STDOUT Apache Arrow support

Hi,

There is also a new Arrow C library (one .h and one .c file) which makes it easier to use it from the postgresql codebase.

https://arrow.apache.org/blog/2023/03/07/nanoarrow-0.1.0-release/

https://github.com/apache/arrow-nanoarrow/tree/main/dist

Best regards,

Adam Lippai

On Thu, Apr 13, 2023 at 2:35 PM Adam Lippai <adam@rigo.sk> wrote:

Hi,

There are two bigger developments in this topic:

1. Pandas 2.0 is released and it can use Apache Arrow as a backend
2. Apache Arrow ADBC is released which standardizes the client API. Currently it uses the postgresql wire protocol underneath

Best regards,

Adam Lippai

On Thu, Apr 21, 2022 at 10:41 AM Adam Lippai <adam@rigo.sk> wrote:

Hi,

would it be possible to add Apache Arrow streaming format to the copy backend + frontend?

The use case is fetching (or storing) tens or hundreds of millions of rows for client side data science purposes (Pandas, Apache Arrow compute kernels, Parquet conversion etc). It looks like the serialization overhead when using the postgresql wire format can be significant.

Best regards,

Adam Lippai