1select @@global.pseudo_thread_id;
2ERROR HY000: Variable 'pseudo_thread_id' is a SESSION variable
3select @@session.pseudo_thread_id between 1 and 10000;
4@@session.pseudo_thread_id between 1 and 10000
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6should be empty
7show global variables like 'pseudo_thread_id';
8Variable_name	Value
9show session variables like 'pseudo_thread_id';
10Variable_name	Value
11pseudo_thread_id	#
12should be empty
13select * from information_schema.global_variables where variable_name='pseudo_thread_id';
14VARIABLE_NAME	VARIABLE_VALUE
15select @@session.pseudo_thread_id = variable_value from information_schema.session_variables where variable_name='pseudo_thread_id';
16@@session.pseudo_thread_id = variable_value
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18set session pseudo_thread_id=42;
19select @@session.pseudo_thread_id;
20@@session.pseudo_thread_id
2142
22select * from information_schema.global_variables where variable_name='pseudo_thread_id';
23VARIABLE_NAME	VARIABLE_VALUE
24select variable_value from information_schema.session_variables where variable_name='pseudo_thread_id';
25variable_value
2642
27set global pseudo_thread_id=1;
28ERROR HY000: Variable 'pseudo_thread_id' is a SESSION variable and can't be used with SET GLOBAL
29set session pseudo_thread_id=1.1;
30ERROR 42000: Incorrect argument type to variable 'pseudo_thread_id'
31set session pseudo_thread_id=1e1;
32ERROR 42000: Incorrect argument type to variable 'pseudo_thread_id'
33set session pseudo_thread_id="foo";
34ERROR 42000: Incorrect argument type to variable 'pseudo_thread_id'
35