This is the documentation I was able to find:
In all the examples the parent value is specified. I want to search for a child value across all parent values. Specifically, I want to get a list of all records that have a any parent value but no child value.
It doesn't look like that is currently supported, so there doesn't seem to be an easy way to accomplish this.
I can think of 3 alternatives at the moment:
1. Build a jql query where you AND together a bunch of cascadeOptions (one for every possible first level value of the field).
2. Develop, or have someone else develop, a new searcher for the cascading select field type.
3. Create a hidden text field which will store some value, maybe "TRUE", if the cascading field on that issue has both values, and "FALSE" if it only has the parent issue. Then you can just query this hidden field. You'd probably need to use either a listener or a Scripted Field to keep everything up to date.
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