patch: very simply optimalization of string_agg

Pavel Stehule <pavel.stehule@gmail.com>

From: Pavel Stehule <pavel.stehule@gmail.com>
To: PostgreSQL Hackers <pgsql-hackers@postgresql.org>
Date: 2011-12-21T10:12:33Z
Lists: pgsql-hackers

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Hello

This remove a not necessary string to text overhead

Regards

Pavel Stehule