配置单元填充子查询表

Question

我正在使用Hive作为首选接口的Hadoop数据库。 我希望能够将多个SELECT语句组合到一个查询中（有点像UNION，但每个查询都填充不同的列）。下面的查询将在单个列中返回我需要的所有结果，但我希望能够使用每个查询来填充单个列。 任何有关如何完成此操作的帮助都将是很棒的-相当于VALUES的某种Hive可能可以做到。 干杯。

INSERT OVERWRITE TABLE tstr_tmp SELECT * FROM
(SELECT time_stamp FROM http WHERE ext_hostname = 'exotichorse' AND dt = '01/07/2015' AND ext_url = 'http://lucy.info' ORDER BY time_stamp asc limit 1) as last_visit_of_day
UNION ALL 
SELECT * FROM (SELECT CAST(COUNT(hr) as string) FROM http WHERE ext_hostname = 'exotichorse' AND dt = '01/07/2015' AND ext_url = 'http://lucy.info' group by  ext_url) as n_hour_bins
UNION ALL
SELECT * FROM (SELECT time_stamp FROM http WHERE ext_hostname = 'exotichorse' AND dt = '01/07/2015' AND ext_url = 'http://lucy.info' ORDER BY time_stamp desc limit 1) as first_visit_of_day
UNION ALL
SELECT * FROM (SELECT ext_url FROM http  WHERE ext_url = 'http://lucy.info' group by ext_url) as domain_name
UNION ALL
SELECT * FROM (SELECT CAST(count(*) as string) FROM http WHERE ext_hostname = 'exotichorse' AND dt = '01/07/2015' AND ext_url = 'http://lucy.info' group by ext_url) as n_http_requests
UNION ALL
SELECT * FROM (SELECT int_ip FROM http WHERE ext_hostname = 'exotichorse' group by int_ip) as internal_ip;

按照下面的要求，每个查询将以字符串形式返回一个值。 对于此特定查询集，将返回以下结果；

00:08:00
2
07:00:00
http://lucy.info
2
192.168.0.22

我正在使用一个数据库，该数据库将告诉我有关用户流量的信息，因此该子集将填充下表。

CREATE TABLE metric_http_domain_time_summary( last_visit_of_day string, n_hour_bins string, first_visit_of_day string, domain_name string, n_http_requests string, internal_ip string) PARTITIONED BY (dt string, hr string, origin string, cl string, st string);

我知道我需要对要传入的数据进行分区，但是我对此非常有信心，一旦设法使未分区的查询运行，就可以对其进行编辑。 我能力上的不足是将子查询串在一起以填充表格。

Answer 1

在离开并考虑了很长一段时间后，我已经找到了答案。 UNION不必要，实际上妨碍了操作。 该查询将根据需要返回上述输出。 万一其他人有同样的问题，它将保留这个生命。 由于堆栈溢出信誉限制，我不得不删除ext_url，但是这个概念可以工作。

SELECT * FROM
(SELECT time_stamp FROM http WHERE referrer_hostname = 'exotichorse' AND dt = '01/07/2015' AND ext_url = 'ext_url_here' ORDER BY time_stamp asc limit 1) as last_visit_of_day,
(SELECT CAST(COUNT(hr) as string) FROM http WHERE referrer_hostname = 'exotichorse' AND dt = '01/07/2015' AND ext_url = 'ext_url_here' group by  ext_url) as n_hour_bins,
(SELECT time_stamp FROM http WHERE referrer_hostname = 'exotichorse' AND dt = '01/07/2015' AND ext_url = 'ext_url_here' ORDER BY time_stamp desc limit 1) as first_visit_of_day,
(SELECT ext_url FROM http  WHERE ext_url = 'http://lucy.info' group by ext_url) as domain_name,
(SELECT CAST(count(*) as string) FROM http WHERE referrer_hostname = 'exotichorse' AND dt = '01/07/2015' AND ext_url = 'ext_url_here' group by ext_url) as n_http_requests,
(SELECT int_ip FROM http WHERE referrer_hostname = 'exotichorse' group by int_ip) as internal_ip;