visit_Arel_Nodes_UpdateStatement

# File activerecord/lib/arel/visitors/postgresql.rb, line 7
        def visit_Arel_Nodes_UpdateStatement(o, collector)
          collector.retryable = false
          o = prepare_update_statement(o)

          collector << "UPDATE "

          # UPDATE with JOIN is in the form of:
          #
          #   UPDATE t1 AS __active_record_update_alias
          #   SET ..
          #   FROM t1 JOIN t2 ON t2.join_id = t1.join_id ..
          #   WHERE t1.id = __active_record_update_alias.id AND ..
          if has_join_sources?(o)
            collector = visit o.relation.left, collector
            collect_nodes_for o.values, collector, " SET "
            collector << " FROM "
            collector = inject_join o.relation.right, collector, " "
          else
            collector = visit o.relation, collector
            collect_nodes_for o.values, collector, " SET "
          end

          collect_nodes_for o.wheres, collector, " WHERE ", " AND "
          collect_nodes_for o.orders, collector, " ORDER BY "
          maybe_visit o.limit, collector
          maybe_visit o.comment, collector
        end