This file is indexed.

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

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#
# Some tests uses LOAD DATA with a relative path
# and need to see for example ../std_data
#
# Also if an absolute path was used, the server might be started
# with --secure-file-priv and wouldn't be allowed to LOAD a file
# outside of it's vardir anyway
#


if (`select LOCATE('$MYSQLTEST_VARDIR', REPLACE(@@datadir, '\\\\', '/')) != 1`)
{
  skip Need mysqld in MYSQLTEST_VARDIR;
}