Database name was set incorrectly for any show command
  that used sunqueries in its where condition.
information_schema.test, information_schema.result:
  Added a test case for bug #12636.


mysql-test/r/information_schema.result:
  Added a test case for bug #12636.
mysql-test/t/information_schema.test:
  Added a test case for bug #12636.
sql/sql_show.cc:
  Database name was set incorrectly for any show command
  that used sunqueries in its where condition.