# Bug 12902967: Creating self referencing fk on same index unhandled,
# confusing error
#
# Creating a self referencing foreign key on the same
# column/index is an unhandled exception, it should throw a sensible
# error but instead implies that your data dictionary may now be out
# of sync:

--source include/have_innodb.inc
--source include/not_embedded.inc

let error_log= $MYSQLTEST_VARDIR/log/mysqld.1.err;
--source include/restart_mysqld.inc

create table t1 (f1 integer primary key) engine innodb;

# The below statement should produce error message in error log.
# This error message should mention problem with foreign keys
# rather than with data dictionary.
--replace_regex /'\.\/test\/#sql-[0-9a-f_]*'/'#sql-temporary'/
--error ER_ERROR_ON_RENAME
alter table t1 add constraint c1 foreign key (f1) references t1(f1);
--source include/restart_mysqld.inc
perl;
$file = $ENV{error_log};
open (FILE, '<', $file) or die "can't open(< $file): $!\n";
print ((grep { /^InnoDB:/ and not /aio/i and not /io_setup\(\) attempt [0-9]+ failed/ } <FILE>)[-2..-1]);
EOF

drop table t1;