visit_Arel_Nodes_IsDistinctFrom

# File activerecord/lib/arel/visitors/to_sql.rb, line 673
        def visit_Arel_Nodes_IsDistinctFrom(o, collector)
          if o.right.nil?
            collector = visit o.left, collector
            collector << " IS NOT NULL"
          else
            collector = is_distinct_from(o, collector)
            collector << " = 1"
          end
        end