fix: Error if child _group selected without parent groupBy #781
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Relevant issue(s)
Resolves #702
Description
Error pleasantly if child _group selected without parent groupBy. Proposed fix is the simple solution, however there was talk about adding a query validation package/stage (possibly between mapper and planner), however that would take a fair amount more effort, and currently this might be the only item requiring it - if there are others I would suggest noting them all in a refactor ticket and moving them (including this simple fix) to that system in a dedicated ticket - but let me know as we did mention this in standup I think.
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