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module Arel
class Aggregation < Compound
include Recursion::BaseCase
def initialize(relation)
@relation = relation
end
def wheres
[]
end
def table_sql(formatter = Sql::TableReference.new(relation))
formatter.select relation.select_sql, self
end
def attributes
@attributes ||= relation.attributes.collect(&:to_attribute).collect { |a| a.bind(self) }
end
def name
relation.name + '_aggregation'
end
def ==(other)
Aggregation === other and
self.relation == other.relation
end
end
class Relation
def externalize
@externalized ||= aggregation?? Aggregation.new(self) : self
end
def aggregation?
false
end
end
end
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