Re: JSONB - JSONB operator feature request

Hi,

hstore have only key-value pairs, but in json can have same behavior -
only equal objects are removed:

SELECT '{"a": 1, "b": {"c": 2}}'::JSONB - '{"a": 1, "b": {"c": 3}}'::JSONB

'{"b": {"c": 2}}'

SELECT '{"a": 1, "b": {"c": 2}}'::JSONB - '{"a": 2, "b": {"c": 2}}'::JSONB

'{"a": 1}'

David

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Od: David Fetter <david(at)fetter(dot)org>
Komu: david(dot)turon(at)linuxbox(dot)cz
Kopie: pgsql-hackers(at)postgresql(dot)org
Datum: 18. 07. 2017 18:24
Předmět: Re: [HACKERS] JSONB - JSONB operator feature request

On Tue, Jul 18, 2017 at 01:36:32PM +0200, david(dot)turon(at)linuxbox(dot)cz wrote:
> Hi,
>
> some users and me used hstore - hstore for example storing only changed
> rows in trigger like:
>
> hstore(NEW) - hstore(OLD)
>
> There isn't same operator/function in JSON/JSONB. We can only remove
keys
> from JSONB, but not equal key-value pairs. Is there any chance to have
> same feature with JSON/JSONB in postgres core?

What would - mean precisely for JSON[B]?

For example, what would you expect

SELECT '{"a": 1, "b": {"c": 2}}'::JSONB - '{"b": 1, "b": {"c": 3}}'::JSONB

to yield?

Best,
David.
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