Re: Emitting JSON to file using COPY TO

Dean Rasheed <dean.a.rasheed@gmail.com>

From: Dean Rasheed <dean.a.rasheed@gmail.com>

To: Joe Conway <mail@joeconway.com>

Cc: Daniel Verite <daniel@manitou-mail.org>, Andrew Dunstan <andrew@dunslane.net>, Davin Shearer <davin@apache.org>, PostgreSQL-development <pgsql-hackers@postgresql.org>

Date: 2024-01-08T19:36:34Z

Lists: pgsql-hackers

Commits

Same data as JSON: GET /api/v1/messages/:b64id/commits the thread's linked commits as JSON, with link sources. API reference →

Add option force_array for COPY JSON FORMAT
- 4c0390ac53b7 19 (unreleased) landed
json format for COPY TO
- 7dadd38cda95 19 (unreleased) landed
introduce CopyFormat, refactor CopyFormatOptions
- a2145605ee3d 19 (unreleased) landed
Doc: add IDs to copy.sgml's <varlistentry> and <refsect1>
- e4018f891dec 19 (unreleased) cited

On Thu, 7 Dec 2023 at 01:10, Joe Conway <mail@joeconway.com> wrote:
>
> The attached should fix the CopyOut response to say one column.
>

Playing around with this, I found a couple of cases that generate an error:

COPY (SELECT 1 UNION ALL SELECT 2) TO stdout WITH (format json);

COPY (VALUES (1), (2)) TO stdout WITH (format json);

both of those generate the following:

ERROR:  record type has not been registered

Regards,
Dean