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module Arel
class Aggregation < Compound
include Recursion::BaseCase
def initialize(relation)
@relation = relation
end
def selects
[]
end
def table_sql(formatter = Sql::TableReference.new(relation))
relation.to_sql(formatter)
end
def attributes
@attributes ||= relation.attributes.collect(&:to_attribute)
end
def ==(other)
self.class == other.class and self.relation == other.relation
end
end
end
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