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module Arel
module Expressions
def count distinct = false
Nodes::Count.new [self], distinct
end
def sum
Nodes::Sum.new [self]
end
def maximum
Nodes::Max.new [self]
end
def minimum
Nodes::Min.new [self]
end
def average
Nodes::Avg.new [self]
end
def extract field
Nodes::Extract.new [self], field
end
end
end
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