pgsql: Add: > > * Add the ability to automatically create materialized

Log Message:
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Add:

* Add the ability to automatically create materialized views

Right now materialized views require the user to create triggers on the
main table to keep the summary table current. SQL syntax should be able
to manager the triggers and summary table automatically. A more
sophisticated implementation would automatically retrieve from the
summary table when the main table is referenced, if possible.

Modified Files:
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pgsql/doc:
TODO (r1.2237 -> r1.2238)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/TODO?r1=1.2237&r2=1.2238)
pgsql/doc/src/FAQ:
TODO.html (r1.746 -> r1.747)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/FAQ/TODO.html?r1=1.746&r2=1.747)