Horton

Re: Speed up COPY FROM text/CSV parsing using SIMD

Nazir Bilal Yavuz <byavuz81@gmail.com>

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From: Nazir Bilal Yavuz <byavuz81@gmail.com>
To: Manni Wood <manni.wood@enterprisedb.com>
Cc: KAZAR Ayoub <ma_kazar@esi.dz>, Nathan Bossart <nathandbossart@gmail.com>, Andrew Dunstan <andrew@dunslane.net>, Shinya Kato <shinya11.kato@gmail.com>, PostgreSQL-development <pgsql-hackers@postgresql.org>
Date: 2025-12-10T11:59:41Z
Lists: pgsql-hackers

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Hi,

On Wed, 10 Dec 2025 at 01:13, Manni Wood <manni.wood@enterprisedb.com> wrote:
>
> Bilal Yavuz (Nazir Bilal Yavuz?),

It is Nazir Bilal Yavuz, I changed some settings on my phone and it
seems that it affected my mail account, hopefully it should be fixed
now.

> I did not get a chance to do any work on this today, but wanted to thank you for finding my logic errors in counting special chars for CSV, and hacking on my naive solution to make it faster. By attempting Andrew Dunstan's suggestion, I got a better feel for the reality that the "housekeeping" code produces a significant amount of overhead.

You are welcome! v4.1 has some problems with in_quote case in SIMD
handling code and counting cstate->chars_processed variable. I fixed
them in v4.2.

-- 
Regards,
Nazir Bilal Yavuz
Microsoft