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# MDEV-4029 SELECT on information_schema using a subquery locks up the information_schema table due to incorrect mutexes handling
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select variable_name from information_schema.session_status where variable_name =
(select variable_name from information_schema.session_status where variable_name = 'uptime');
select variable_name from information_schema.session_variables where variable_name =
(select variable_name from information_schema.session_variables where variable_name = 'basedir');
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