initialize_copy

# File activerecord/lib/arel/nodes/select_core.rb, line 35
      def initialize_copy(other)
        super
        @source      = @source.clone if @source
        @projections = @projections.clone
        @wheres      = @wheres.clone
        @groups      = @groups.clone
        @havings     = @havings.clone
        @windows     = @windows.clone
      end