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https://issues.apache.org/jira/browse/HIVE-18375?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16313657#comment-16313657
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Paul Jackson edited comment on HIVE-18375 at 1/5/18 6:49 PM:
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[~pxiong] I'm referring to the four queries in this comment:
https://issues.apache.org/jira/browse/HIVE-18375?focusedCommentId=16312051&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-16312051
was (Author: pauljackson123):
[~pxiong] I'm referring to the for queries in this comment:
https://issues.apache.org/jira/browse/HIVE-18375?focusedCommentId=16312051&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-16312051
> 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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