Question

CREATE TABLE big_hive_table(
`partner` string,
start_date date,
end_date date,
`category` string,
`category2` string);

insert into big_hive_table values ('S1','2018-01-01','2018-03-31','c1','M');
insert into big_hive_table values ('S1','2017-12-01','2018-01-31','c1','M');
insert into big_hive_table values ('S1','2017-01-01','2017-11-30','c1','M');
insert into big_hive_table values ('S1','2018-02-01','2018-04-30','c1','M');
insert into big_hive_table values ('S1','2018-02-01','2018-04-30','c1','L');
insert into big_hive_table values ('S2','2018-02-01','2018-04-30','c1','S');
insert into big_hive_table values ('S3','2018-02-01','2018-04-30','c2','S');
insert into big_hive_table values ('S3','2018-01-01','2018-03-31','c2','S');
insert into big_hive_table values ('S3','2017-12-01','2018-01-31','c2','S');

问题：如果有重叠的时间段，请获取组（合作伙伴category，category2）的最旧开始日期和最新结束日期

expected result: 

S1  01/12/2017  30/04/2018  c1  M
S1  01/01/2017  30/11/2017  c1  M
S1  01/02/2018  30/04/2018  c1  L
S2  01/02/2018  30/04/2018  c1  S
S3  01/12/2017  30/04/2018  c2  S

我的查询

SELECT DISTINCT partner, 
                category, 
                category2, 
                First_value(start_date) OVER (partition BY partner, category, category2 ORDER BY start_date) period_start,
                last_value(end_date) OVER (partition BY partner, category, category2 ORDER BY start_date rows BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED following) period_end
from (select pps.*, sum(start_new_period) over (partition BY partner, category, category2)
    FROM ( select partner, 
            start_date,
            end_date, 
            category, 
            category2, 
            lag(end_date) over (partition by partner, category, category2 order by start_date) previous_period_end
            , case 
                when start_date > lag(end_date) over (partition by partner, category, category2 order by start_date) 
                then 1 
                else 0 
                end start_new_period
            from big_hive_table
            where start_date is not null and end_date is not null) pps
)

当我运行2个内部查询（来自select pps。*）或整个查询时，当前出现以下错误：

Caused by: java.lang.RuntimeException: org.apache.hadoop.hive.ql.parse.SemanticException:Failed to breakup Windowing invocations into Groups. At least 1 group must only depend on input columns. Also check for circular dependencies.
Underlying error: Primitve type DATE not supported in Value Boundary expression

谁能建议我所缺少的。感谢您的帮助。

Answer 1

只需在 first_value 窗口函数中添加 rows BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED following ，然后尝试再次运行。

更改查询

来自

First_value(start_date) OVER (partition BY partner, category, category2 
ORDER BY start_date) period_start

收件人

First_value(start_date) OVER (partition BY partner, category, category2 ORDER BY
 start_date rows BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED following) period_start

有Jira关于原始类型支持的信息，在Hive.2.1.0中已得到解决

在DATE的子查询和外部查询中的Hive窗口

1 个答案: