arrays - 在Hive中的数组内查询

Question

我看过this，但是它不适用于我的数据。
我有此数据:

 1, John, a@com;b@com2,32
 2, Jack, ab@com;c@com2,33

并通过以下方式将它们加载为配置单元:

create table t7(id int,name string, email Array<string>, age int)
ROW FORMAT DELIMITED
FIELDS TERMINATED BY ','
COLLECTION items terminated by ';'
STORED AS textfile;
Load data inpath '/user/maria_dev/7.txt' into table t7;

和选择输出

但是我无法在数组中搜索特定值


那么，我想念什么？

Answer 1

您无法使用的原因是，第一个元素之前有空格，因此必须使用trim

select * from t7 where trim(email[0]) like "%a@%";

CREATE TABLE `t7`(
  `id` int,
  `name` string,
  `email` array<string>,
  `age` int)
ROW FORMAT DELIMITED
  FIELDS TERMINATED BY ','
  COLLECTION ITEMS TERMINATED BY '\;'

hive> select * from t7 where trim(email[0])="a@com";
OK
1        John   [" a@com","b@com2"]     32

hive> select * from t7 LATERAL VIEW explode(email) exploded_table as id_email where id_email like "%com2%";
OK
1        John   [" a@com","b@com2"]     32      b@com2
2        Jack   [" ab@com","c@com2"]    33      c@com2