add test thread_pool_min_basic

mysql-test/suite/sys_vars/r/thread_pool_min_threads_basic.result

+SET @start_global_value = @@global.thread_pool_min_threads;
+select @@global.thread_pool_min_threads;
+@@global.thread_pool_min_threads
+1
+select @@session.thread_pool_min_threads;
+ERROR HY000: Variable 'thread_pool_min_threads' is a GLOBAL variable
+show global variables like 'thread_pool_min_threads';
+Variable_name	Value
+thread_pool_min_threads	1
+show session variables like 'thread_pool_min_threads';
+Variable_name	Value
+thread_pool_min_threads	1
+select * from information_schema.global_variables where variable_name='thread_pool_min_threads';
+VARIABLE_NAME	VARIABLE_VALUE
+THREAD_POOL_MIN_THREADS	1
+select * from information_schema.session_variables where variable_name='thread_pool_min_threads';
+VARIABLE_NAME	VARIABLE_VALUE
+THREAD_POOL_MIN_THREADS	1
+set global thread_pool_min_threads=1;
+select @@global.thread_pool_min_threads;
+@@global.thread_pool_min_threads
+1
+set global thread_pool_min_threads=65536;
+Warnings:
+Warning	1292	Truncated incorrect thread_pool_min_threads value: '65536'
+select @@global.thread_pool_min_threads;
+@@global.thread_pool_min_threads
+256
+set session thread_pool_min_threads=1;
+ERROR HY000: Variable 'thread_pool_min_threads' is a GLOBAL variable and should be set with SET GLOBAL
+set global thread_pool_min_threads=1.1;
+ERROR 42000: Incorrect argument type to variable 'thread_pool_min_threads'
+set global thread_pool_min_threads=1e1;
+ERROR 42000: Incorrect argument type to variable 'thread_pool_min_threads'
+set global thread_pool_min_threads="foo";
+ERROR 42000: Incorrect argument type to variable 'thread_pool_min_threads'
+set global thread_pool_min_threads=0;
+Warnings:
+Warning	1292	Truncated incorrect thread_pool_min_threads value: '0'
+select @@global.thread_pool_min_threads;
+@@global.thread_pool_min_threads
+1
+set global thread_pool_min_threads=10000000000;
+Warnings:
+Warning	1292	Truncated incorrect thread_pool_min_threads value: '10000000000'
+select @@global.thread_pool_min_threads;
+@@global.thread_pool_min_threads
+256
+SET @@global.thread_pool_min_threads = @start_global_value;

mysql-test/suite/sys_vars/t/thread_pool_min_threads_basic.test

+# uint global
+--source include/not_embedded.inc
+--source include/windows.inc
+SET @start_global_value = @@global.thread_pool_min_threads;
+
+#
+# exists as global only
+#
+select @@global.thread_pool_min_threads;
+--error ER_INCORRECT_GLOBAL_LOCAL_VAR
+select @@session.thread_pool_min_threads;
+show global variables like 'thread_pool_min_threads';
+show session variables like 'thread_pool_min_threads';
+select * from information_schema.global_variables where variable_name='thread_pool_min_threads';
+select * from information_schema.session_variables where variable_name='thread_pool_min_threads';
+
+#
+# show that it's writable
+#
+set global thread_pool_min_threads=1;
+select @@global.thread_pool_min_threads;
+set global thread_pool_min_threads=65536;
+select @@global.thread_pool_min_threads;
+--error ER_GLOBAL_VARIABLE
+set session thread_pool_min_threads=1;
+
+#
+# incorrect types
+#
+--error ER_WRONG_TYPE_FOR_VAR
+set global thread_pool_min_threads=1.1;
+--error ER_WRONG_TYPE_FOR_VAR
+set global thread_pool_min_threads=1e1;
+--error ER_WRONG_TYPE_FOR_VAR
+set global thread_pool_min_threads="foo";
+
+
+set global thread_pool_min_threads=0;
+select @@global.thread_pool_min_threads;
+set global thread_pool_min_threads=10000000000;
+select @@global.thread_pool_min_threads;
+
+SET @@global.thread_pool_min_threads = @start_global_value;