On Tue, Mar 21, 2006 at 10:39:03PM -0500, Tom Lane wrote: > AFAICS, the main part of the type system that isn't modular is the > support for type parameters (a/k/a typmod), such as the maximum length > for varchar or the precision/scale for numeric. We could certainly > invent an API for interpreting such parameters. But in the current state > of the system the types that have such parameters have to be hard-wired > into the SQL grammar, and I don't see how to get rid of that hard-wiring > without breaking a whole lot of stuff. Any bison gurus hanging about?
We've been here before: http://archives.postgresql.org/pgsql-hackers/2005-08/msg01142.php Turns out it isn't too hard, except there are a number of limitations. Unfortunatly I seem to have the deleted the patch I created then. :( Summerising the thread then: - It made some changes to what was and wasn't a reserved word. - Character sets for CHAR types still fall outside the system. - Some other changes in behaviour I'm not sure if much has changed since that discussion. Have a nice day, -- Martijn van Oosterhout <kleptog@svana.org> http://svana.org/kleptog/ > Patent. n. Genius is 5% inspiration and 95% perspiration. A patent is a > tool for doing 5% of the work and then sitting around waiting for someone > else to do the other 95% so you can sue them.
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