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From "Pengcheng Xiong (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-18375) Cannot ORDER by subquery fields unless they are selected
Date Fri, 05 Jan 2018 00:18:20 GMT

    [ https://issues.apache.org/jira/browse/HIVE-18375?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16312255#comment-16312255
] 

Pengcheng Xiong commented on HIVE-18375:
----------------------------------------

May be related to HIVE-15160.

> Cannot ORDER by subquery fields unless they are selected
> --------------------------------------------------------
>
>                 Key: HIVE-18375
>                 URL: https://issues.apache.org/jira/browse/HIVE-18375
>             Project: Hive
>          Issue Type: Bug
>          Components: Query Processor
>    Affects Versions: 2.3.2
>         Environment: Amazon AWS
> Release label:emr-5.11.0
> Hadoop distribution:Amazon 2.7.3
> Applications:Hive 2.3.2, Pig 0.17.0, Hue 4.0.1
> classification=hive-site,properties=[hive.strict.checks.cartesian.product=false,hive.mapred.mode=nonstrict]
>            Reporter: Paul Jackson
>            Priority: Minor
>
> Give these tables:
> {code:SQL}
> CREATE TABLE employees (
>     emp_no      INT,
>     first_name  VARCHAR(14),
>     last_name   VARCHAR(16)
> );
> insert into employees values
> (1, 'Gottlob', 'Frege'),
> (2, 'Bertrand', 'Russell'),
> (3, 'Ludwig', 'Wittgenstein');
> CREATE TABLE salaries (
>     emp_no      INT,
>     salary      INT,
>     from_date   DATE,
>     to_date     DATE
> );
> insert into salaries values
> (1, 10, '1900-01-01', '1900-01-31'),
> (1, 18, '1900-09-01', '1900-09-30'),
> (2, 15, '1940-03-01', '1950-01-01'),
> (3, 20, '1920-01-01', '1950-01-01');
> {code}
> This query returns the names of the employees ordered by their peak salary:
> {code:SQL}
> SELECT `employees`.`last_name`, `employees`.`first_name`, `t1`.`max_salary`
> FROM `default`.`employees`
> INNER JOIN
>  (SELECT `emp_no`, MAX(`salary`) `max_salary`
>   FROM `default`.`salaries`
>   WHERE `emp_no` IS NOT NULL AND `salary` IS NOT NULL
>   GROUP BY `emp_no`) AS `t1`
> ON `employees`.`emp_no` = `t1`.`emp_no`
> ORDER BY `t1`.`max_salary` DESC;
> {code}
> However, this should still work even if the max_salary is not part of the projection:
> {code:SQL}
> SELECT `employees`.`last_name`, `employees`.`first_name`
> FROM `default`.`employees`
> INNER JOIN
>  (SELECT `emp_no`, MAX(`salary`) `max_salary`
>   FROM `default`.`salaries`
>   WHERE `emp_no` IS NOT NULL AND `salary` IS NOT NULL
>   GROUP BY `emp_no`) AS `t1`
> ON `employees`.`emp_no` = `t1`.`emp_no`
> ORDER BY `t1`.`max_salary` DESC;
> {code}
> However, that fails with this error:
> {code}
> Error while compiling statement: FAILED: SemanticException [Error 10004]: line 9:9 Invalid
table alias or column reference 't1': (possible column names are: last_name, first_name)
> {code}
> FWIW, this also fails:
> {code:SQL}
> SELECT `employees`.`last_name`, `employees`.`first_name`, `t1`.`max_salary` AS `max_sal`
> FROM `default`.`employees`
> INNER JOIN
>  (SELECT `emp_no`, MAX(`salary`) `max_salary`
>   FROM `default`.`salaries`
>   WHERE `emp_no` IS NOT NULL AND `salary` IS NOT NULL
>   GROUP BY `emp_no`) AS `t1`
> ON `employees`.`emp_no` = `t1`.`emp_no`
> ORDER BY `t1`.`max_salary` DESC;
> {code}
> But this succeeds:
> {code:SQL}
> SELECT `employees`.`last_name`, `employees`.`first_name`, `t1`.`max_salary` AS `max_sal`
> FROM `default`.`employees`
> INNER JOIN
>  (SELECT `emp_no`, MAX(`salary`) `max_salary`
>   FROM `default`.`salaries`
>   WHERE `emp_no` IS NOT NULL AND `salary` IS NOT NULL
>   GROUP BY `emp_no`) AS `t1`
> ON `employees`.`emp_no` = `t1`.`emp_no`
> ORDER BY `max_sal` DESC;
> {code}



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