[facets] should remove groupby from base rqlst. Closes #1796196
as we search for values for a variable, there seems to be no case
where we would be interested in groups, though there are clearly
some were leaving groups cause errors.
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from yams.buildobjs import EntityType, RelationDefinition, String, SubjectRelation
class comments(RelationDefinition):
subject = 'Comment'
object = 'Card'
cardinality='1*'
composite='object'
class Tag(EntityType):
name = String(unique=True)
tags = SubjectRelation('CWUser')