File: json_conv.out

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CREATE FUNCTION conv(o json) RETURNS json AS $$
if (o instanceof Array) {
	o[1] = 10;
} else if (typeof(o) == 'object') {
	o.i = 10;
}
return o;
$$ LANGUAGE pljs;
SELECT conv('{"i": 3, "b": 20}');
      conv       
-----------------
 {"i":10,"b":20}
(1 row)

SELECT conv('[1, 2, 3]');
   conv   
----------
 [1,10,3]
(1 row)