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 <da...@fetter.org>
Komu: david.tu...@linuxbox.cz
Kopie: pgsql-hackers@postgresql.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.tu...@linuxbox.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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