Hive中常用函数 wm_concat & concat_ws & collect_set & sort_array总结concat_ws & collect_set:wm_concat sort_array & collect_set & concat_ws（等同wm_concat ）
concat_ws & collect_set:应用1:user each_id user_id1 id1 user_id1 id2 user_id2 id1 user_id2 id2 user_id2 id3 user_id3 id1 user ids user_id1 id1,id2 user_id2 id1,id2,id3 user_id3 id1 select dt,
