/usr/lib/mysql-testsuite/t/myisam_icp.test is in mysql-testsuite-5.6 5.6.16-1~exp1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# ICP/MyISAM tests (Index Condition Pushdown)
# (Turns off all other 6.0 optimizer switches)
#
--source include/have_index_condition_pushdown.inc
set optimizer_switch='index_condition_pushdown=on';
--disable_query_log
if (`select locate('semijoin', @@optimizer_switch) > 0`)
{
set optimizer_switch='semijoin=off';
}
if (`select locate('materialization', @@optimizer_switch) > 0`)
{
set optimizer_switch='materialization=off';
}
if (`select locate('mrr', @@optimizer_switch) > 0`)
{
set optimizer_switch='mrr=off';
}
--enable_query_log
--source include/icp_tests.inc
set optimizer_switch=default;
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