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SET @start_global_value = @@global.innodb_parallel_read_threads;
SELECT @start_global_value;
#
# exists as global and session
#
select @@global.innodb_parallel_read_threads in (2, 64);
select @@global.innodb_parallel_read_threads;
select @@session.innodb_parallel_read_threads;
show global variables like 'innodb_parallel_read_threads';
show session variables like 'innodb_parallel_read_threads';
--disable_warnings
select * from performance_schema.global_variables where variable_name='innodb_parallel_read_threads';
select * from performance_schema.session_variables where variable_name='innodb_parallel_read_threads';
--enable_warnings
#
# show that it's writable
#
set global innodb_parallel_read_threads=3;
select @@global.innodb_parallel_read_threads;
--disable_warnings
select * from performance_schema.global_variables where variable_name='innodb_parallel_read_threads';
select * from performance_schema.session_variables where variable_name='innodb_parallel_read_threads';
--enable_warnings
set @@global.innodb_parallel_read_threads=2;
select @@global.innodb_parallel_read_threads;
--disable_warnings
select * from performance_schema.global_variables where variable_name='innodb_parallel_read_threads';
select * from performance_schema.session_variables where variable_name='innodb_parallel_read_threads';
--enable_warnings
set global innodb_parallel_read_threads=0;
select @@global.innodb_parallel_read_threads;
--disable_warnings
select * from performance_schema.global_variables where variable_name='innodb_parallel_read_threads';
select * from performance_schema.session_variables where variable_name='innodb_parallel_read_threads';
--enable_warnings
set @@global.innodb_parallel_read_threads=3;
select @@global.innodb_parallel_read_threads;
--disable_warnings
select * from performance_schema.global_variables where variable_name='innodb_parallel_read_threads';
select * from performance_schema.session_variables where variable_name='innodb_parallel_read_threads';
--enable_warnings
set session innodb_parallel_read_threads=2;
set @@session.innodb_parallel_read_threads=3;
#
# incorrect types
#
--error ER_WRONG_TYPE_FOR_VAR
set global innodb_parallel_read_threads=1.1;
--error ER_WRONG_TYPE_FOR_VAR
set global innodb_parallel_read_threads=1e1;
--echo NOTE: The following should fail with ER_WRONG_VALUE_FOR_VAR (BUG#50643)
set global innodb_parallel_read_threads=-3;
select @@global.innodb_parallel_read_threads;
--disable_warnings
select * from performance_schema.global_variables where variable_name='innodb_parallel_read_threads';
select * from performance_schema.session_variables where variable_name='innodb_parallel_read_threads';
--enable_warnings
--error ER_WRONG_TYPE_FOR_VAR
set global innodb_parallel_read_threads='AUTO';
#
# Cleanup
#
SET @@global.innodb_parallel_read_threads = @start_global_value;
SELECT @@global.innodb_parallel_read_threads;
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