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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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Early evaluation of subqueries in the WHERE conditions on I_S.*_STATUS tables,
otherwise the subquery on this same table will try to acquire LOCK_status twice.

sql/item.h:
  remove unused method
This commit is contained in:
Sergei Golubchik 2013-01-20 00:46:51 +01:00
commit cc74bb3178
4 changed files with 29 additions and 7 deletions
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8
mysql-test/r/information_schema2.result Normal file
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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');
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');
variable_name
BASEDIR