--echo #
--echo # Test of MyISAM MRG tables with corrupted children.
--echo # Run with --myisam-recover=force option.
--echo #
--echo # Preparation: we need to make sure that the merge parent
--echo # is never left in the table cache when closed, since this may
--echo # have effect on merge children.
--echo # For that, we set the table cache to minimal size and populate it
--echo # in a concurrent connection.
connect(con1,localhost,root,,test,,);
--echo #
--echo # Switching to connection con1
--echo #
connection con1;
--echo #
--echo # Minimal values.
--echo #
set global table_open_cache=256;
set global table_definition_cache=256;
--disable_warnings
drop procedure if exists p_create_and_lock;
--enable_warnings
delimiter |;
create procedure p_create()
begin
  declare i int default 1;
  set @lock_table_stmt="lock table ";
  set @drop_table_stmt="drop table ";
  while i < @@global.table_definition_cache + 1 do
    set @table_name=concat("t_", i);
    set @opt_comma=if(i=1, "", ", ");
    set @lock_table_stmt=concat(@lock_table_stmt, @opt_comma,
                                @table_name, " read");
    set @drop_table_stmt=concat(@drop_table_stmt, @opt_comma, @table_name);
    set @create_table_stmt=concat("create table if not exists ",
                                  @table_name, " (a int)");
    prepare stmt from @create_table_stmt;
    execute stmt;
    deallocate prepare stmt;
    set i= i+1;
  end while;
end|
delimiter ;|
call p_create();
drop procedure p_create;
--disable_query_log
let $lock=`select @lock_table_stmt`;
eval $lock;
--enable_query_log
--echo #
--echo # Switching to connection 'default'
--echo #
connection default;

--disable_warnings
drop table if exists t1, t1_mrg, t1_copy;
--enable_warnings
let $MYSQLD_DATADIR=`select @@datadir`;
--echo #
--echo # Prepare a MERGE engine table, that refers to a corrupted
--echo # child.
--echo # 
create table t1 (a int, key(a)) engine=myisam;
create table t1_mrg (a int) union (t1) engine=merge;
--echo #
--echo # Create a table with a corrupted index file:
--echo # save an old index file, insert more rows, 
--echo # overwrite the new index file with the old one.
--echo #
insert into  t1 (a) values (1), (2), (3);
flush table t1;
--copy_file $MYSQLD_DATADIR/test/t1.MYI $MYSQLD_DATADIR/test/t1_copy.MYI
insert into  t1 (a) values (4), (5), (6);
flush table t1;
--remove_file $MYSQLD_DATADIR/test/t1.MYI
--copy_file $MYSQLD_DATADIR/test/t1_copy.MYI $MYSQLD_DATADIR/test/t1.MYI
--remove_file $MYSQLD_DATADIR/test/t1_copy.MYI
--echo # check table is needed to mark the table as crashed.
check table t1;
--echo #
--echo # At this point we have a merge table t1_mrg pointing to t1,
--echo # and t1 is corrupted, and will be auto-repaired at open.
--echo # Check that this doesn't lead to memory corruption.
--echo #
select * from t1_mrg;
--echo #
--echo # Cleanup
--echo #
drop table t1, t1_mrg;
--echo #
--echo # Switching to connection con1
--echo #
connection con1;
unlock tables;
prepare stmt from @drop_table_stmt;
execute stmt;
deallocate prepare stmt;
set @@global.table_definition_cache=default;
set @@global.table_open_cache=default;
disconnect con1;
connection default;