visit_Arel_Nodes_IsDistinctFrom

# File activerecord/lib/arel/visitors/mssql.rb, line 30
        def visit_Arel_Nodes_IsDistinctFrom(o, collector)
          if o.right.nil?
            collector = visit o.left, collector
            collector << " IS NOT NULL"
          else
            collector << "NOT "
            visit_Arel_Nodes_IsNotDistinctFrom o, collector
          end
        end