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["Davanum Srinivas \(DIMS\)" <davanum@xxxxxxxxx>]

** Changed in: nova/icehouse
       Status: New => Won't Fix

** Changed in: nova
       Status: Confirmed => Won't Fix

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https://bugs.launchpad.net/bugs/1298690

Title:
  sqlite regexp() function doesn't behave like mysql

Status in OpenStack Compute (nova):
  Won't Fix
Status in OpenStack Compute (nova) icehouse series:
  Won't Fix

Bug description:
  In bug 1298494 I recently saw a case where the unit tests (using
  sqlite) behaved differently than devstack with mysql.

  The issue seems to be when we do

  filters = {'uuid': group.members, 'deleted_at': None}
  instances = instance_obj.InstanceList.get_by_filters(
                  context, filters=filters)

  
  Eventually down in db/sqlalchemy/api.py we end up calling

  query = query.filter(column_attr.op(db_regexp_op)(
                                   str(filters[filter_name])))

  where str(filters[filter_name]) is the string 'None'.

  When using mysql, a regexp comparison of the string 'None' against a
  NULL field fails to match.

  Since sqlite doesn't have its own regexp function we provide one in
  openstack/common/db/sqlalchemy/session.py.  In the buggy case we end
  up calling it as regexp('None', None), where the types are "unicode"
  and "NoneType".  However, we end up converting the second arg to text
  type before calling reg.search() on it, so it matches.

  This is a bug, we want the unit tests to behave like the real system.

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