License

This software, plan_filter module for PostgreSQL, is released under 
the terms of the PostgreSQL License.

Copyright (c) 2012-2015, PostgreSQL Experts Inc. and Andrew Dunstan, Licensors
Portions (c) 2015 additional contributors

Permission to use, copy, modify, and distribute this software and its 
documentation for any purpose, without fee, and without a written agreement 
is hereby granted, provided that the above copyright notice and this paragraph 
and the following two paragraphs appear in all copies.

IN NO EVENT SHALL LICENSORS BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT, 
SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING LOST PROFITS, ARISING 
OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF LICENSORS 
HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

LICENSORS SPECIFICALLY DISCLAIM ANY WARRANTIES, INCLUDING, BUT NOT 
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A 
PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS ON AN "AS IS" BASIS,
AND LICENSORS HAVE NO OBLIGATIONS TO PROVIDE MAINTENANCE, SUPPORT, 
UPDATES, ENHANCEMENTS, OR MODIFICATIONS.