drop table dim_campaign_tags;
create external table dim_campaign_tags(
  campaign_id string comment '头条campain_id,与本公司内部campain_id无关',
  platform string comment 'ios or android',
  tag string comment 'tag name',
  `comment` string comment '中文注释'
)
ROW FORMAT DELIMITED FIELDS TERMINATED BY '\t'
location 's3://mob-emr-test/dataplatform/DataWareHouse/schema/dwh/dim_campaign_tags/2018/04/24';