I am trying to preform an unusual query. I em effectively thing to find all the 
records in a parent where the parent has children. Any suggestions other than 
build a collection of records primary keys and use an “in” conditional. Which 
feels dirty.


This this case I have a table “cases” with records and a Child table with 
records. There is a one to many relationship from child to parent with a return 
path of “childReference_return” I am looking for all the parents who have 
children. There is more to the query but I am only looking at this parent child 
element.



I have tried using something like.

$records:=ds.Parents.query (“childReference_return.length>0”)

But when I do this I get null back. 
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