On 09/28/2012 08:22 AM, Peter Eisentraut wrote:
(3) Invent an auxiliary type along the lines of "json_value" and say
that you create a cast from foo to json_value when you want one
interpretation, or directly to json if you want the other. Then
things like record_to_json would look for the appropriate type of cast.
This is a bit ugly because the auxiliary type has no reason to live
other than to separate the two kinds of cast, but it avoids creating
any new JSON-specific mechanisms in the type system.
What if some wanted to create a yaml type as an extension. How would
they associate yaml and yaml_value?
Well, of course it wouldn't be a problem if the code could know the OID
of yaml_value ... :-)
cheers
andrew
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