/usr/lib/mysql-testsuite/t/subquery_all.test is in percona-server-test-5.6 5.6.22-rel71.0-0ubuntu4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 | #
# Run subquery.inc with all of the so-called 6.0 features.
#
--source include/have_semijoin.inc
--source include/have_materialization.inc
--source include/have_firstmatch.inc
--source include/have_loosescan.inc
--source include/have_index_condition_pushdown.inc
--source include/have_mrr.inc
set optimizer_switch='semijoin=on,materialization=on,firstmatch=on,loosescan=on,index_condition_pushdown=on,mrr=on,mrr_cost_based=off';
--source include/subquery.inc
set optimizer_switch=default;
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