Index optimization error on expression of the form (boolean expression) not
When a an index is on a Boolean variable, query optimization does not handle the legel grammatical construction '(each.booleanVar) not'. For example, this expression results in an invalid query operator error:
'(each.emailed) not'
Workaround
Change the path term that will resolve into a boolean to be a comparision, for example:
'(each.emailed == false) not'
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