latral view
latral view 如果这个字段为null,则过滤掉,加上outer则不会过滤掉 https://data.bytedance.net/aeolus/#/queryEditor/query/653d49344bb79ca8?appId=36&blockId=2578040&group=default&taskId=15774548 https://stackoverflow.com/questions/40715815/hive-how-to-include-null-rows-in-lateral-view-explode