案例时 - 喜欢 - 在Hadoop Hive中的REGEXP

Question

我想使用CASE WHEN，LIKE和正则表达式在hive表中编写查询。我使用过regexp和rlike，但我没有得到预期的结果。到目前为止，我的尝试如下

    select distinct ending from
(select date, ending, name, count(distinct id) 
from (select CONCAT_WS("/",year,month,day,hour) as date, id, name,
case when type = 'TRAN' then 'tran'
when events regexp '%[:]no_reply[:]%[^o][^n][:]incomplete[:]%' and type rlike '%HUP' then 'con'
when events not regexp '%[:]no_reply[:]%[^o][^n][:]incomplete[:]%' and type rlike '%HUP'  then 'aban'
else 'other'
end as ending
from data_struct1) tmp
group by date, ending, name) tmp2;

并且

select distinct ending from
    (select date, ending, name, count(distinct id) 
    from (select CONCAT_WS("/",year,month,day,hour) as date, id, name,
    case when type = 'TRAN' then 'tran'
    when events rlike '%[:]no_reply[:]%[^o][^n][:]incomplete[:]%' and type rlike '%HUP' then 'con'
    when events not rlike '%[:]no_reply[:]%[^o][^n][:]incomplete[:]%' and type rlike '%HUP'  then 'aban'
    else 'other'
    end as ending
    from data_struct1) tmp
    group by date, ending, name) tmp2;

两个查询都返回不正确的结果（语法不错，只是结果不正确）。

Answer 1

关于正则表达式量词的文档很多，例如：https://docs.microsoft.com/en-us/dotnet/standard/base-types/quantifiers-in-regular-expressions

select 'opencase_2,initial_state:inquiry,inquiry:no_reply:initial_state:incomplete::,inquiry:reask:secondary_state:complete::' regexp 'no_reply:[^:]+:incomplete';

OK
true

这也错了：rlike '%HUP'。它应该像这个'.*HUP$'（在字符串的末尾）或简单地'HUP'如果HUP所在的位置无关紧要：在字符串的中间或结尾或开头

rlike和regexp在你的查询中工作相同，最好使用相同的运算符：regexp或rlike only。这两个是同义词。

测试：https://regex101.com/r/ksG67v/1