This question is in reference to Atlassian Documentation: JIRA Core 7.0.x release notes
I think there's a missing question here, but I suspect the question is either
1) Does JQL have a "group by" clause? To which the answer is "no", because JQL is for finding issues, not displaying the results of the search
2) For internal users, the SQL for groups is simply "have a look at the membership_base table"
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