Re: Proposition for autoname columns

On Mon, Nov 2, 2020 at 05:05:29PM +0200, Eugen Konkov wrote:
> Hello Pgsql-hackers,
>
> When selecting data from json column it named as '?column?'
> tucha=# select info->>'suma', docn from document order by id desc limit 5;
> ?column? | docn
> ----------+------
> 665.97 | 695
> 513.51 | 632
> 665.97 | 4804
> 492.12 | 4315
> 332.98 | 1302
> (5 rows)
>
> It would be useful if the name of column will be autoassigned based on
> name of json key. Like at next query:
>
> tucha=# select info->>'suma' as suma, docn from document order by id desc limit 5;
> suma | docn
> --------+------
> 665.97 | 695
> 513.51 | 632
> 665.97 | 4804
> 492.12 | 4315
> 332.98 | 1302
> (5 rows)
>
>
> Would it be useful this auto assigned name for column from json?

I think we could do it, but it would only work if the column was output
as a single json value, and not a multi-key/value field. I am afraid if
we tried to do it, the result would be too inconsistent to be useful.

--
Bruce Momjian <bruce(at)momjian(dot)us> https://momjian.us
EnterpriseDB https://enterprisedb.com

The usefulness of a cup is in its emptiness, Bruce Lee