visit_Arel_Nodes_Grouping

# File activerecord/lib/arel/visitors/to_sql.rb, line 315
        def visit_Arel_Nodes_Grouping(o, collector)
          if o.expr.is_a? Nodes::Grouping
            visit(o.expr, collector)
          else
            collector << "("
            visit(o.expr, collector) << ")"
          end
        end