# File lib/meta_search/builder.rb, line 305
    def get_join_type(opt_join)
      # Allow "inner"/:inner and "upper"/:upper
      if opt_join.to_s.upcase == 'INNER'
        opt_join = Arel::Nodes::InnerJoin
      elsif opt_join.to_s.upcase == 'OUTER'
        opt_join = Arel::Nodes::OuterJoin
      end
      # Default to trusting what the user gave us
      opt_join
    end