年轻人常用网站网优工程师前景和待遇
presto的行列转换和spark、hive一样也是通过外链语句实现的，只不过语法和关键子有点不同，如下
with tmp1 as (select '1,2,3' as a1,'4,5,6' as a2
)
select * from tmp1 cross join unnest(split(tmp1.a1, ','),split(tmp1.a2, ',')
) as b(a1s,a2s)
结果如下
presto的行列转换和spark、hive一样也是通过外链语句实现的，只不过语法和关键子有点不同，如下
with tmp1 as (select '1,2,3' as a1,'4,5,6' as a2
)
select * from tmp1 cross join unnest(split(tmp1.a1, ','),split(tmp1.a2, ',')
) as b(a1s,a2s)
结果如下