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/usr/share/mysql/uninstall_rewriter.sql is in percona-xtradb-cluster-server-5.7 5.7.20-29.24-0ubuntu2.

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/* Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; version 2 of the License.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software Foundation,
   51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA */

DROP DATABASE IF EXISTS query_rewrite;
DROP FUNCTION load_rewrite_rules;
UNINSTALL PLUGIN rewriter;