CREATE FOREIGN TABLE ( ... LIKE ... )

Folks,

Please find attached a patch implementing and documenting, to some
extent, $subject. I did this in aid of being able to import SQL
standard catalogs and other entities where a known example could
provide a template for a foreign table.

Should there be errhint()s, too? Should we pile up all such errors
and mention them at the end rather than simply bailing on the first
one?

TBD: regression tests.

Cheers,
David.
--
David Fetter <david(at)fetter(dot)org> http://fetter.org/
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