# Tests for various concurrency-related aspects of CREATE TABLE ... SELECT
# and CREATE TABLE like implementation.
#
# Note that we don't test general CREATE TABLE ... SELECT/LIKE functionality
# here as it is already covered by create.test. We are more interested in
# extreme cases.
#
# 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
# Some of tests below also use binlog to check that statements are
# executed and logged in correct order
--source include/have_binlog_format_mixed_or_statement.inc

# Create auxilliary connections
connect (addconroot1, localhost, root,,);
connect (addconroot2, localhost, root,,);
connect (addconroot3, localhost, root,,);
connection default;

--disable_warnings
drop table if exists t1,t2,t3,t4,t5;
--enable_warnings


#
# Tests for concurrency problems in CREATE TABLE ... SELECT
#
# We introduce delays between various stages of table creation
# and check that other statements dealing with this table cannot
# interfere during those delays.
#
# What happens in situation when other statement messes with
# table to be created before it is created ?
# Concurrent CREATE TABLE
set session debug="+d,sleep_create_select_before_create";
--send create table t1 select 1 as i;
connection addconroot1;
--sleep 2
--error ER_TABLE_EXISTS_ERROR
create table t1 (j char(5));
connection default;
--reap
show create table t1;
drop table t1;
# Concurrent CREATE TABLE ... SELECT
--send create table t1 select 1 as i;
connection addconroot1;
--sleep 2
--error ER_TABLE_EXISTS_ERROR
create table t1 select "Test" as j;
connection default;
--reap
show create table t1;
drop table t1;
# Concurrent CREATE TABLE LIKE
create table t3 (j char(5));
--send create table t1 select 1 as i;
connection addconroot1;
--sleep 2
--error ER_TABLE_EXISTS_ERROR
create table t1 like t3;
connection default;
--reap
show create table t1;
drop table t1;
# Concurrent RENAME TABLE
--send create table t1 select 1 as i;
connection addconroot1;
--sleep 2
--error ER_TABLE_EXISTS_ERROR
rename table t3 to t1;
connection default;
--reap
show create table t1;
drop table t1;
# Concurrent ALTER TABLE RENAME
--send create table t1 select 1 as i;
connection addconroot1;
--sleep 2
--error ER_TABLE_EXISTS_ERROR
alter table t3 rename to t1;
connection default;
--reap
show create table t1;
drop table t1;
# Concurrent ALTER TABLE RENAME which also adds column
--send create table t1 select 1 as i;
connection addconroot1;
--sleep 2
--error ER_TABLE_EXISTS_ERROR
alter table t3 rename to t1, add k int;
connection default;
--reap
show create table t1;
drop table t1, t3;
# What happens if other statement sneaks in after the table
# creation but before its opening ?
set session debug="-d,sleep_create_select_before_create:+d,sleep_create_select_before_open";
# Concurrent DROP TABLE
--send create table t1 select 1 as i;
connection addconroot1;
--sleep 2
drop table t1;
connection default;
--reap
# Concurrent RENAME TABLE
--send create table t1 select 1 as i;
connection addconroot1;
--sleep 2
rename table t1 to t2;
connection default;
--reap
drop table t2;
# Concurrent SELECT
--send create table t1 select 1 as i;
connection addconroot1;
--sleep 2
select * from t1;
connection default;
--reap
drop table t1;
# Concurrent INSERT
--send create table t1 select 1 as i;
connection addconroot1;
--sleep 2
insert into t1 values (2);
connection default;
--reap
select * from t1;
drop table t1;
# Concurrent CREATE TRIGGER 
set @a:=0;
--send create table t1 select 1 as i;
connection addconroot1;
--sleep 2
create trigger t1_bi before insert on t1 for each row set @a:=1;
connection default;
--reap
select @a;
drop table t1;
# Okay, now the same tests for the potential gap between open and lock
set session debug="-d,sleep_create_select_before_open:+d,sleep_create_select_before_lock";
# Concurrent DROP TABLE
--send create table t1 select 1 as i;
connection addconroot1;
--sleep 2
drop table t1;
connection default;
--reap
# Concurrent RENAME TABLE
--send create table t1 select 1 as i;
connection addconroot1;
--sleep 2
rename table t1 to t2;
connection default;
--reap
drop table t2;
# Concurrent SELECT
--send create table t1 select 1 as i;
connection addconroot1;
--sleep 2
select * from t1;
connection default;
--reap
drop table t1;
# Concurrent INSERT
--send create table t1 select 1 as i;
connection addconroot1;
--sleep 2
insert into t1 values (2);
connection default;
--reap
select * from t1;
drop table t1;
# Concurrent CREATE TRIGGER 
set @a:=0;
--send create table t1 select 1 as i;
connection addconroot1;
--sleep 2
create trigger t1_bi before insert on t1 for each row set @a:=1;
connection default;
--reap
select @a;
drop table t1;
# Some tests for case with existing table
set session debug="-d,sleep_create_select_before_lock:+d,sleep_create_select_before_check_if_exists";
create table t1 (i int);
# Concurrent DROP TABLE
--send create table if not exists t1 select 1 as i;
connection addconroot1;
--sleep 2
drop table t1;
connection default;
--reap
# Concurrent CREATE TRIGGER 
create table t1 (i int);
set @a:=0;
--send create table if not exists t1 select 1 as i;
connection addconroot1;
--sleep 2
create trigger t1_bi before insert on t1 for each row set @a:=1;
connection default;
--reap
select @a;
select * from t1;
drop table t1;
set session debug="-d,sleep_create_select_before_check_if_exists";


# Test for some details of CREATE TABLE ... SELECT implementation.
#
# We check that create placeholder is handled properly if we have
# to reopen tables in open_tables().
# This test heavily relies on current implementation of name-locking/
# table cache so it may stop working if it changes. OTOH it such problem
# will serve as warning that such changes should not be done lightly.
create table t2 (a int);
create table t4 (b int);
connection addconroot2;
lock table t4 write;
select 1;
connection addconroot1;
# Create placeholder/name-lock for t3
--send create table t3 as select * from t4;
--sleep 2
connection default;
# This statement creates placeholder for t1, then opens t2,
# then meets name-lock for t3 and then reopens all tables
--send create table t1 select * from t2, t3;
--sleep 2
connection addconroot2;
unlock tables;
connection addconroot1;
--reap
connection default;
--reap
select * from t1;
show create table t1;
drop table t1, t3;
# Now similar test which proves that we really temporarily
# remove placeholder when we reopen tables.
connection addconroot2;
lock table t4 read;
select 1;
connection addconroot1;
# Create name-lock for t3 
--send rename table t4 to t3;
--sleep 2
connection default;
# This statement creates placeholder for t1, then opens t2,
# then meets name-lock for t3 and then reopens all tables
--send create table if not exists t1 select 1 as i from t2, t3;
--sleep 2
connection addconroot3;
# We should be able to take name-lock on table t1 as we should not have
# open placeholder for it at this point (otherwise it is possible to
# come-up with situation which will lead to deadlock, e.g. think of
# concurrent CREATE TABLE t1 SELECT * FROM t2 and RENAME TABLE t2 TO t1)
create table t5 (j int);
# This statement takes name-lock on t1 and therefore proves 
# that there is no active open placeholder for it.
rename table t5 to t1;
connection addconroot2;
unlock tables;
connection addconroot1;
--reap
connection default;
--reap
select * from t1;
show create table t1;
drop table t1, t2, t3;


# Tests for possible concurrency issues with CREATE TABLE ... LIKE
#
# Bug #18950 "create table like does not obtain LOCK_open"
# Bug #23667 "CREATE TABLE LIKE is not isolated from alteration by other
#             connections"
#
# Again the idea of this test is that we introduce artificial delays on
# various stages of table creation and check that concurrent statements
# for tables from CREATE TABLE ... LIKE are not interfering.

--disable_warnings
drop table if exists t1,t2;
--enable_warnings

# What happens if some statements sneak in right after we have
# opened source table ?
create table t1 (i int);
set session debug="+d,sleep_create_like_before_check_if_exists";
# Reset binlog to have clear start
reset master;
--send create table t2 like t1;
connection addconroot1;
--sleep 2
# DML on source table should be allowed to run concurrently
insert into t1 values (1);
# And DDL should wait
drop table t1;
connection default;
--reap
show create table t2;
drop table t2;
# Let us check that statements were executed/binlogged in correct order
source include/show_binlog_events.inc;

# Now let us check the gap between check for target table
# existance and copying of .frm file. 
create table t1 (i int);
set session debug="-d,sleep_create_like_before_check_if_exists:+d,sleep_create_like_before_copy";
# It should be impossible to create target table concurrently
--send create table t2 like t1;
connection addconroot1;
--sleep 2
create table if not exists t2 (j int);
connection default;
--reap
show create table t2;
drop table t2;
# And concurrent DDL on the source table should be still disallowed 
reset master;
--send create table t2 like t1;
connection addconroot1;
--sleep 2
drop table t1;
connection default;
--reap
drop table t2;
source include/show_binlog_events.inc;

# And now he gap between copying of .frm file and ha_create_table() call. 
create table t1 (i int);
set session debug="-d,sleep_create_like_before_copy:+d,sleep_create_like_before_ha_create";
# Both DML and DDL on target table should wait till operation completes
reset master;
--send create table t2 like t1;
connection addconroot1;
--sleep 2
insert into t2 values (1);
connection default;
--reap
drop table t2;
--send create table t2 like t1;
connection addconroot1;
--sleep 2
drop table t2;
connection default;
--reap
# Concurrent DDL on the source table still waits 
--send create table t2 like t1;
connection addconroot1;
--sleep 2
drop table t1;
connection default;
--reap
drop table t2;
source include/show_binlog_events.inc;

# Finally we check the gap between ha_create_table() and binlogging
create table t1 (i int);
set session debug="-d,sleep_create_like_before_ha_create:+d,sleep_create_like_before_binlogging";
reset master;
--send create table t2 like t1;
connection addconroot1;
--sleep 2
insert into t2 values (1);
connection default;
--reap
drop table t2;
--send create table t2 like t1;
connection addconroot1;
--sleep 2
drop table t2;
connection default;
--reap
--send create table t2 like t1;
connection addconroot1;
--sleep 2
drop table t1;
connection default;
--reap
drop table t2;
source include/show_binlog_events.inc;

set session debug="-d,sleep_create_like_before_binlogging";