I'm running "PostgreSQL 9.5.1 on i686-pc-linux-gnu, compiled by gcc-4.4.real (Debian 4.4.5-8) 4.4.5, 32-bit"
I'm trying out json functions and stumbled on a problem with json_populate_record. To try out the function I decided to take records from table test convert them to json and immediately repopulate them back into records of type test, but it fails with this message:
Is it a bug or how am I supposed to use the populate function ?
Personally, I'd call it a bug - whether design or implementation doesn't matter to me.
What json_populate_record seems to be looking for when faced with a "text[]" typed field is something of the form:
{"key":"{\"abc\",\"def\",\"ghi\"}"}
IOW, this works:
select j, json_populate_record(null::test, j)
from
(
select '{"id":1,"txt":"jkl","txt_arr":"{\"abc\",\"def\",\"fgh\"}","f":3.14159}'::json AS j
) r
Namely a scalar literal that looks like a PostgreSQL array - as opposed to an actual JSON array.
The literal text is sent through the input function for text[] and gets parsed into a PostgreSQL text array.
Given that this presently errors I would suggest we fix this case so that both forms are acceptable to the parser. In other words, try harder in our effort to coerce between the two formats.
