Example of ALTER COLUMN TYPE with USING

Folks,

This patch adds an example of ALTER COLUMN TYPE with a USING clause.

Thanks to Tom Lane both for writing the feature and making sure I got
it documented right :)

Cheers,
D
--
David Fetter david@fetter.org http://fetter.org/
phone: +1 510 893 6100 mobile: +1 415 235 3778

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