set @innodb_stats_persistent_save= @@innodb_stats_persistent;
set @innodb_stats_persistent_sample_pages_save=
      @@innodb_stats_persistent_sample_pages;

set global innodb_stats_persistent= 1;
set global innodb_stats_persistent_sample_pages=100;

--source include/have_innodb.inc
--source include/no_valgrind_without_big.inc

SET SESSION DEFAULT_STORAGE_ENGINE='InnoDB';

select @@global.use_stat_tables;
select @@session.use_stat_tables;

set @save_use_stat_tables=@@use_stat_tables;

set use_stat_tables='preferably';

--disable_warnings
DROP DATABASE IF EXISTS dbt3_s001;
--enable_warnings

CREATE DATABASE dbt3_s001;

use dbt3_s001;

set @save_optimizer_switch=@@optimizer_switch;
set optimizer_switch='extended_keys=off';
set optimizer_switch='rowid_filter=off';
 
--disable_query_log
--disable_result_log
--disable_warnings
--source include/dbt3_s001.inc
delete from mysql.table_stats;
delete from mysql.column_stats;
delete from mysql.index_stats;
ANALYZE TABLE
customer, lineitem, nation, orders, part, partsupp, region, supplier;
--enable_warnings
--enable_result_log
--enable_query_log

--echo #
--echo # Bug mdev-503: optimizer ignores setting use_stat_tables='preferably'
--echo # 

flush tables 
customer, lineitem, nation, orders, part, partsupp, region, supplier;

let $Q3S=
select sql_calc_found_rows straight_join
       l_orderkey, sum(l_extendedprice*(1-l_discount)) as revenue,
       o_orderdate, o_shippriority
from orders, customer, lineitem
where c_mktsegment = 'BUILDING' and c_custkey = o_custkey
      and l_orderkey = o_orderkey and o_orderdate < date '1995-03-15'
      and l_shipdate > date '1995-03-15'
group by l_orderkey, o_orderdate, o_shippriority
order by revenue desc, o_orderdate
limit 10;

set use_stat_tables='never';
--replace_column 9 #
eval EXPLAIN $Q3S;

set use_stat_tables='preferably';
--replace_result 2 1
eval EXPLAIN $Q3S;

flush tables customer, orders, lineitem;
eval EXPLAIN $Q3S;

--echo # End of the test case for mdev-503

set optimizer_switch=@save_optimizer_switch;


DROP DATABASE dbt3_s001;

use test;

set use_stat_tables=@save_use_stat_tables;


SET SESSION DEFAULT_STORAGE_ENGINE=DEFAULT;

set global innodb_stats_persistent= @innodb_stats_persistent_save;
set global innodb_stats_persistent_sample_pages=
             @innodb_stats_persistent_sample_pages_save;