Re: Calling json_* functions with JSONB data

On Mon, May 23, 2016 at 12:55 PM, Peter van Hardenberg <pvh@pvh.ca> wrote:

Hi there,

I noticed it was very easy to accidentally call the json_* form of JSON manipulation functions with jsonb data as input. This is pretty sub-optimal, since it involves rendering the jsonb then reparsing it and calling the json_* form of the function.

Fortunately, this seems quite easy to resolve by taking advantage of our ability to add json_*(jsonb) form of the functions.

I talked this over with Andrew who had no objections and suggested I float it on the list before writing a patch. Looks pretty straightforward, just a few new data rows in pg_proc.h.

Anyone have any concerns or suggestions?

Please provide an example of what you are talking about.

SELECT json_array_length('[1,2]'::jsonb)

ERROR: function json_array_length(jsonb) does not exist

-- The function name is "jsonb_array_length"; and there is no implicit cast between the two.