#
# Tests for various concurrency-related aspects of ALTER TABLE implemetation
#
# This test takes rather long time so let us run it only in --big-test mode
--source include/big_test.inc
# We are using some debug-only features in this test
--source include/have_debug.inc
# Also we are using SBR to check that statements are executed
# in proper order.
--source include/have_binlog_format_mixed_or_statement.inc


#
# Test for bug #25044 "ALTER TABLE ... ENABLE KEYS acquires global
# 'opening tables' lock".
#
# ALTER TABLE ... ENABLE KEYS should not acquire LOCK_open mutex for
# the whole its duration as it prevents other queries from execution.
--disable_warnings
drop table if exists t1, t2;
--enable_warnings
connect (addconroot, localhost, root,,);
connection default;
create table t1 (n1 int, n2 int, n3 int,
                key (n1, n2, n3),
                key (n2, n3, n1),
                key (n3, n1, n2));
create table t2 (i int);

# Starting from 5.1 we have runtime settable @@debug variable,
# which can be used for introducing delays at certain points of
# statement execution, so we don't need many rows in 't1' to make
# this test repeatable.
alter table t1 disable keys;
insert into t1 values (RAND()*1000, RAND()*1000, RAND()*1000);

# Later we use binlog to check the order in which statements are
# executed so let us reset it first.
reset master;
set session debug="+d,sleep_alter_enable_indexes";
--send alter table t1 enable keys;
connection addconroot;
--sleep 2
# This statement should not be blocked by in-flight ALTER and therefore
# should be executed and written to binlog before ALTER TABLE ... ENABLE KEYS
# finishes.
insert into t2 values (1);
# And this should wait until the end of ALTER TABLE ... ENABLE KEYS.
insert into t1 values (1, 1, 1);
connection default;
--reap
set session debug="-d,sleep_alter_enable_indexes";
# Check that statements were executed/binlogged in correct order.
--replace_column 2 # 5 #
show binlog events in 'master-bin.000001' from 106;

# Clean up
drop tables t1, t2;


--echo End of 5.0 tests

#
# Additional coverage for the main ALTER TABLE case
#
# We should be sure that table being altered is properly
# locked during statement execution and in particular that
# no DDL or DML statement can sneak in and get access to
# the table when real operation has already taken place
# but this fact has not been noted in binary log yet.
--disable_warnings
drop table if exists t1, t2, t3;
--enable_warnings
create table t1 (i int);
# We are going to check that statements are logged in correct order
reset master;
set session debug="+d,sleep_alter_before_main_binlog";
--send alter table t1 change i c char(10) default 'Test1';
connection addconroot;
--sleep 2
insert into t1 values ();
select * from t1;
connection default;
--reap
--send alter table t1 change c vc varchar(100) default 'Test2';
connection addconroot;
--sleep 2
rename table t1 to t2;
connection default;
--reap
drop table t2;
# And now tests for ALTER TABLE with RENAME clause. In this
# case target table name should be properly locked as well.
create table t1 (i int);
--send alter table t1 change i c char(10) default 'Test3', rename to t2;
connection addconroot;
--sleep 2
insert into t2 values ();
select * from t2;
connection default;
--reap
--send alter table t2 change c vc varchar(100) default 'Test2', rename to t1;
connection addconroot;
--sleep 2
rename table t1 to t3;
connection default;
--reap
drop table t3;
set session debug="-d,sleep_alter_before_main_binlog";

# Check that all statements were logged in correct order
--replace_column 2 # 5 #
show binlog events in 'master-bin.000001' from 106;


--echo End of 5.1 tests
