- Add function Item_param::fix_fields which will update any subselect they are part of and indicate that the subsleect is not const during prepare phase, and thus should not be executed during prepare.


mysql-test/include/ps_query.inc:
  Adde new test case
mysql-test/r/ps_2myisam.result:
  Update test result
mysql-test/r/ps_3innodb.result:
  Update test result
mysql-test/r/ps_4heap.result:
  Update test result
mysql-test/r/ps_5merge.result:
  Update test result
mysql-test/r/ps_6bdb.result:
  Update test result
mysql-test/r/ps_7ndb.result:
  Update test result
sql/item.cc:
  Add function Item_param::fix_fields, which will mark any subselects they are part of as not being a constant expression unless the param value is specified, ie. it will be not be constant during prepare phase.
sql/item.h:
  Adde Item_param::fix_fields
sql/item_subselect.h:
  Make Item_param::fix_field friend of Item_subselect