Custom fields for sub-task issues to display parent issue summary in column views.
JIRA's sub-tasks could be used to provide great features for priority handling and progress monitoring. There have only been one drawback using the sub-tasks as users can't always figure out the parent issue from column views that only display parent issue key.
This add-on allows users to figure out the parent issue context easily without opening the parent issue. Two main custom fields are included: Parent Issue Summary and Extended Summary.