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Hadoop 如何在impala中查询数组元素?_Hadoop_Hive_Impala - Fatal编程技术网

Hadoop 如何在impala中查询数组元素?

Hadoop 如何在impala中查询数组元素?,hadoop,hive,impala,Hadoop,Hive,Impala,我在impala中创建了一个表,表有两列 +-----------+---------------------+---------+ | name | type | comment | +-----------+---------------------+---------+ | unique_id | string | | | cmap | array<struct< |

我在impala中创建了一个表,表有两列

+-----------+---------------------+---------+
| name      | type                | comment |
+-----------+---------------------+---------+
| unique_id | string              |         |
| cmap      | array<struct<       |         |
|           |   fieldname:string, |         |
|           |   fieldid:string,   |         |
|           |   fielddata:string  |         |
|           | >>                  |         |
+-----------+---------------------+---------+
我编写了这个sql,但无法查询它,但我在表中插入了数据

sql:

select unique_id  from s_click_parquet,s_click_parquet.cmap as lst  where ( fieldname="ip" and fieldData="192.168.1.145") and(fieldname="wid" and fielddata="15");

通常使用方括号访问数组,但可以使用结构数组,而不仅仅是数组

可以内联struct数组使其成为多行,也可以将字段拆分为可查询的列

然后可以像查询普通表一样查询它

玩弄

select * 
    from table1 t
       lateral view inline(cmap) a;

唯一的Id字符串,cmap数组有表列描述impala中是否支持侧视图?我在文档中没有找到它实际上表示不支持
select * 
    from table1 t
       lateral view inline(cmap) a;