It doesn't matter what values the fields have. I am interested in the fact of the existence of a subtask inside.
2 Answers
You could try the following JQL:
issueFunction in hasSubtasks()
it filters for such issues which satisfy condition hasSubtasks() which is a function for identifying issues with subtasks (but not other types of links).
It seems there are no special operators in JQL for such cases but I've found the solution:
using obviously non-existent task names in combination with issueFunction in parentsOf()
like this issueFunction in parentsOf("issue != BLABLA-100")
It works! And if you wanna get issues without subtasks you can put NOT before the request described above
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