Now I get it, its about operators precedence. Thanks once again!
2015-10-15 14:31 GMT+03:00 Michael Paquier <michael.paquier@gmail.com>:
> On Thu, Oct 15, 2015 at 7:07 PM, boyko yordanov wrote:
> > sravni_hstore=# select ('{"3": {"9703": {"c": 1}}}'::jsonb->'3') ||
> ('{"3":
> > {"8309": {"c": 1}}}'::jsonb->'3');
> > -[ RECORD 1 ]----------------------------------
> > ?column? | {"8309": {"c": 1}, "9703": {"c": 1}}
> >
> > sravni_hstore=# select '{"3": {"9703": {"c": 1}}}'::jsonb->'3' || '{"3":
> > {"8309": {"c": 1}}}'::jsonb->'3';
> > -[ RECORD 1 ]----------------
> > ?column? | {"8309": {"c": 1}}
> >
> > What I expect is that there should be no difference in the output of the
> > last two queries. Not sure if I should submit this as a separate bug?
>
> The last one looks correct to me, the concat operator is using on the
> right side '{"3": {"8309": {"c": 1}}}'::jsonb in your last query, and
> not '{"3": {"8309": {"c": 1}}}'::jsonb->'3', so || takes precedence on
> ->. When applying the parenthesis, ('{"3": {"8309": {"c":
> 1}}}'::jsonb->'3') is completely taken into account.
> --
> Michael
>
