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CREATE FUNCTION get_key(key text, json_data jsonb) RETURNS jsonb
LANGUAGE pljs IMMUTABLE STRICT
AS $$
var val = json_data[key];
var ret = {};
ret[key] = val;
return JSON.stringify(ret);
$$;
CREATE TABLE jsonbonly (
data jsonb
);
COPY jsonbonly (data) FROM stdin;
-- Call twice to test the function cache.
SELECT get_key('ok', data) FROM jsonbonly;
get_key
-----------------
"{\"ok\":true}"
(1 row)
SELECT get_key('ok', data) FROM jsonbonly;
get_key
-----------------
"{\"ok\":true}"
(1 row)
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