Adjust creation/destruction of TupleDesc data structure to reduce the

Tom Lane <tgl@sss.pgh.pa.us>

Commit: a52b4fb1313cbd367d765a2a8704a63709cbbd5d
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2005-03-07T04:42:17Z
Releases: 8.1.0
Adjust creation/destruction of TupleDesc data structure to reduce the
number of palloc calls.  This has a salutory impact on plpgsql operations
with record variables (which create and destroy tupdescs constantly)
and probably helps a bit in some other cases too.

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