如何在 hiveql 中的地图类型上使用 LIKE 运算符？

Question

我想 select 两列 students:

id_test         int
number  map<string,string>

我尝试使用 LIKE 运算符执行以下命令：

SELECT id_test ,number FROM students WHERE id_test = 123456 AND number LIKE %MOBILE%;

并得到这个错误：

FAILED: SemanticException [Error 10014]: Line 1:82 Wrong arguments ''%MOBILE%'': No 
matching method for class org.apache.hadoop.hive.ql.udf.UDFLike with 
(map<string,string>, string). Possible choices: _FUNC_(string, string)

复制代码：

CREATE TABLE students(id_test INT, number MAP<STRING, STRING>) ROW FORMAT DELIMITED FIELDS TERMINATED by
'|' COLLECTION ITEMS TERMINATED BY ',' MAP KEYS TERMINATED BY ':';

INSERT INTO TABLE students SELECT 123434, map('MOBILE','918-555-1162') FROM existingtable LIMIT 1;
INSERT INTO TABLE students SELECT 245678, map('WORK','806-555-4722') FROM existingtable LIMIT 1;

Answer 1

展开地图，然后您可以使用 LIKE 过滤键。如果您希望每个 id_test, number 获得单行，即使有许多键满足 LIKE 条件，请使用 GROUP BY 或 DISTINCT.

演示：

with students as (--one record has many MOBILE* keys in the map
SELECT 123434 id_test , map('MOBILE','918-555-1162', 'OFFICE', '123456', 'MOBILE2', '5678') number union all
SELECT 245678, map('WORK','806-555-4722')
)

select s.id_test, s.number 
  from students s
      lateral view explode(number) n as key,value
where n.key like '%MOBILE%'
group by s.id_test, s.number

结果：

123434 {"MOBILE":"918-555-1162","MOBILE2":"5678","OFFICE":"123456"}

如果您确切地知道密钥 'MOBILE' 那么最好像这样过滤：where number['MOBILE'] is not null，不要爆炸。

Answer 2

select *
from   students
where  concat_ws(' ',map_keys(number)) like '%MOBILE%'

下面贴在这里只是为了让你看看与 LIKE 一起使用的表达式是怎样的：

select concat_ws(' ',map_keys(number))
from   students

+-----------------------+
|          _c0          |
+-----------------------+
| MOBILE MOBILE2 OFFICE |
| WORK                  |
+-----------------------+

如何在 hiveql 中的地图类型上使用 LIKE 运算符？

How can I use the LIKE operator on a map type in hiveql?

sql

dictionary

hive

hiveql

sql-like