NOTE: This suggestion is for JIRA Server. Using JIRA Cloud? See the corresponding suggestion.

Hi everyone,

Thanks for voting and commenting on this issue. Your feedback is key to helping us understand how you use JIRA so we can continue improving your experience. We have reviewed this issue over the last few days; however there are not currently any plans to implement this suggestion.

Please remember that jira.atlassian.com is one of many inputs for the JIRA roadmap. You can learn more about our process here.

I understand that our decision may be disappointing. Please don't hesitate to contact me if you have any questions.

Regards,
Daniel Franz
dfranz@atlassian.com
Principal Product Manager, JIRA Platform

Here's the script:

import com.atlassian.jira.issue.Issue;

Issue parentIssue = issue.getParentObject();
def parentIssueKey, issueKey;

if (parentIssue != null) {
	parentIssueKey = parentIssue.getKey();
    return parentIssueKey;
}
else {
    issueKey = issue.getKey();
    return issueKey;
}

And here's the JQL operand you should append to filters for this ordering to be applied:

ORDER BY "Parent Issue Key" ASC, key ASC