ALTER TABLE "mailbox"."mail"
    ADD COLUMN "first_distribute_comment" varchar(2000),
  ADD COLUMN "second_distribute_comment" varchar(2000);

COMMENT ON COLUMN "mailbox"."mail"."first_distribute_comment" IS '市局下发意见';

COMMENT ON COLUMN "mailbox"."mail"."second_distribute_comment" IS '二级机构下发意见';