一、拆分为多行
测试数据：
huangbo a,1:b,2:c,3
xuzheng a,4:b,5:c,6
wangbaoqiang a,7:b,8:c,9
---创建表的语句：
create table testMap(name string,info map) row format delimited fields terminated by '\t' collection items terminated by ':' map keys terminated by ',';
load data local inpath '/opt/hive_test.txt' into table testMap;
展示效果：
---实现行转列---使用lateral view exlode（）
case1----数据为map
select m.name, tf.key, tf.value from testMap m lateral view explode(m.info) tf as key,value;
case2----数据为Array
数据源：
1 子宫病损切除术，经宫腔镜|扩张和刮宫术，诊断性
2 胫骨内固定装置去除术|腓骨内固定装置去除术
3 腰椎穿刺术|腰椎穿刺术|腰椎穿刺术
--创建语句
Create table testArray(name string, ssmc array ) row format delimited fields terminated by '\t' collection items terminated by '|'; --展示结果
--拆分为多行：
select name,ss.ssmc from testArray lateral view explode(testArray.ssmc) ss as ssmc;--拆分结果：
case3--数据为String
--拆分为多行：
select name,ss.ssmc from testStr lateral view explode(split(ssmc,"\\|")) ss as ssmc;--拆分结果
二、拆分为多列
二、拆分为多列
case1---字段数据为Array
select name,ssmc[0] as ssmc1,ssmc[1] as ssmc2,ssmc[2] as ssmc3 from testArray;
case2---字段数据为String
select t.name,t.ssmcs[0] as ssmc1,t.ssmcs[1] as ssmc2,t.ssmcs[2] as ssmc3 from (
select name,split(ssmc,"\\|") as ssmcs from testArray) t