Hive 对结构数据类型使用like运算符

我有一个包含结构数组的表。是否有一种方法可以使用like运算符筛选此列中的记录

hive> desc location;
location_list           array<struct<city:string,state:string>>

hive> select * from location;
row1 : [{"city":"Hudson","state":"NY"},{"city":"San Jose","state":"CA"},{"city":"Albany","state":"NY"}]
row2 : [{"city":"San Jose","state":"CA"},{"city":"San Diego","state":"CA"}]

hive>desc位置；
位置列表数组
蜂巢>从位置选择*；
第1行：[{“城市”：“哈德逊”，“州”：“纽约”}，{“城市”：“圣何塞”，“州”：“加利福尼亚”}，{“城市”：“奥尔巴尼”，“州”：“纽约”}]
第2行：[{“城市”：“圣何塞”，“州”：“加州”}，{“城市”：“圣地亚哥”，“州”：“加州”}]

我试图运行类似这样的查询，只过滤那些状态为“NY”的记录

hive>select*from location\u列表中的位置，如“%”NY“%”；
失败：SemanticException[错误10014]：第1行：29个错误参数“%”“NY”%”：类org.apache.hadoop.hive.ql.udf.UDFLike没有与（数组，字符串）匹配的方法。可能的选项：_FUNC_（字符串，字符串）

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注意：我可以通过对这个结构列进行lateralview&explode来实现这一点。但是尽量避免这样做，因为我需要将此表与另一个不接受横向视图的表连接起来。

好问题，您可以用以下高效（且漂亮）的方法来完成

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在这种情况下，

location\u list.state

将创建一个字符串数组（您的案例中的状态），因此您可以使用UDF

array\u contains

进行值检查。这将查找精确的值，您将无法执行类似于

like

操作符的匹配，但您应该能够实现所需的

数组演示

：

select my_array  
from
( --emulation of your dataset. Just replace this subquery with your table
 select array(named_struct("city","Hudson","state","NY"),named_struct("city","San Jose","state","CA"),named_struct("city","Albany","state","NY")) as my_array
 union all
 select array(named_struct("city","San Jose","state","CA"),named_struct("city","San Diego","state","CA")) as my_array
)s
where array_contains(my_array.state,'NY') 
;

结果:

OK
[{"city":"Hudson","state":"NY"},{"city":"San Jose","state":"CA"},{"city":"Albany","state":"NY"}]
Time taken: 34.055 seconds, Fetched: 1 row(s)

select my_array  
from
( --emulation of your dataset. Just replace this subquery with your table
 select array(named_struct("city","Hudson","state","NY"),named_struct("city","San Jose","state","CA"),named_struct("city","Albany","state","NY")) as my_array
 union all
 select array(named_struct("city","San Jose","state","CA"),named_struct("city","San Diego","state","CA")) as my_array
)s
where array_contains(my_array.state,'NY') 
;

OK
[{"city":"Hudson","state":"NY"},{"city":"San Jose","state":"CA"},{"city":"Albany","state":"NY"}]
Time taken: 34.055 seconds, Fetched: 1 row(s)