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module Arel
module Nodes
class Sum
attr_accessor :expressions, :alias
def initialize expr, aliaz = nil
@expressions = expr
@alias = aliaz
end
def as aliaz
self.alias = SqlLiteral.new(aliaz)
self
end
def to_sql
viz = Visitors::ToSql.new Table.engine
viz.accept self
end
end
end
end
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