I added a new custom field "Deferred to Date". Because custom fields are optional, none of the existing issues have it.
Now I want a JQL search query for all issues where the deferred date is null (doable) or the deferred date field doesn't exist for the record (this is what I can't find).
I looked at the JQL instructions at http://confluence.atlassian.com/display/JIRA/Advanced+Searching but I don't see anything for checking whether or not a field exists.
Hope this is clear.