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/usr/lib/mysql-testsuite/include/have_firstmatch.inc is in percona-server-test-5.6 5.6.22-rel71.0-0ubuntu4.

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-- require r/have_optimizer_switch.require
--disable_query_log
select locate('firstmatch', @@optimizer_switch) > 0 AS OPTIMIZER_SWITCH;
--enable_query_log