Horton

Re: Emitting JSON to file using COPY TO

Joe Conway <mail@joeconway.com>

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From: Joe Conway <mail@joeconway.com>
To: Andrew Dunstan <andrew@dunslane.net>, Davin Shearer <davin@apache.org>, PostgreSQL-development <pgsql-hackers@postgresql.org>
Date: 2023-12-06T13:49:13Z
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 →

  1. Add option force_array for COPY JSON FORMAT

  2. json format for COPY TO

  3. introduce CopyFormat, refactor CopyFormatOptions

  4. Doc: add IDs to copy.sgml's <varlistentry> and <refsect1>

Attachments

On 12/6/23 07:36, Andrew Dunstan wrote:
> 
> On 2023-12-05 Tu 16:46, Joe Conway wrote:
>> On 12/5/23 16:20, Andrew Dunstan wrote:
>>> On 2023-12-05 Tu 16:09, Joe Conway wrote:
>>>> On 12/5/23 16:02, Joe Conway wrote:
>>>>> On 12/5/23 15:55, Andrew Dunstan wrote:
>>>>>> and in any other case (e.g. LINES) I can't see why you
>>>>>> would have them.
>>>>
>>>> Oh I didn't address this -- I saw examples in the interwebs of MSSQL 
>>>> server I think [1] which had the non-array with commas import and 
>>>> export style. It was not that tough to support and the code as 
>>>> written already does it, so why not?
>>>
>>> That seems quite absurd, TBH. I know we've catered for some absurdity in
>>> the CSV code (much of it down to me), so maybe we need to be liberal in
>>> what we accept here too. IMNSHO, we should produce either a single JSON
>>> document (the ARRAY case) or a series of JSON documents, one per row
>>> (the LINES case).
>>
>> So your preference would be to not allow the non-array-with-commas 
>> case but if/when we implement COPY FROM we would accept that format? 
>> As in Postel'a law ("be conservative in what you do, be liberal in 
>> what you accept from others")?
> 
> 
> Yes, I think so.

Awesome. The attached does it that way. I also ran pgindent.

I believe this is ready to commit unless there are further comments or 
objections.

-- 
Joe Conway
PostgreSQL Contributors Team
RDS Open Source Databases
Amazon Web Services: https://aws.amazon.com