Gavin Henry <gavin.henry@gmail.com> writes:
> This is 9.6 with BDR in.
Um ... I bet not. Maybe you're confusing the version of psql with
that of the server? Because jsonb_build_object() is definitely
there in 9.6.
> ERROR: operator does not exist: jsonb @> json
This one you just need a cast for --- the server won't automatically
convert json to jsonb. (I don't remember why we didn't make that
cast implicit, but probably there was a good reason.)
> How can I check if that function does exist?
On a 9.6 server, you should get
=# \df jsonb_build_object
List of functions
Schema | Name | Result data type | Argument data types | Type
------------+--------------------+------------------+---------------------+--------
pg_catalog | jsonb_build_object | jsonb | | normal
pg_catalog | jsonb_build_object | jsonb | VARIADIC "any" | normal
(2 rows)
If, as I suspect, it's really 9.4, you could substitute
json_build_object(...)::jsonb
regards, tom lane
