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https://issues.apache.org/jira/browse/PHOENIX-945?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14187493#comment-14187493
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Maryann Xue commented on PHOENIX-945:
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[~alexdl] Opened PHOENIX-1392 for the case you suggested.
> Support correlated subqueries in comparison without ANY/SOME/ALL
> ----------------------------------------------------------------
>
> Key: PHOENIX-945
> URL: https://issues.apache.org/jira/browse/PHOENIX-945
> Project: Phoenix
> Issue Type: Sub-task
> Affects Versions: 3.0.0, 4.0.0, 5.0.0
> Reporter: Maryann Xue
> Assignee: Maryann Xue
> Fix For: 5.0.0, 4.2, 3.2
>
> Attachments: 945-2.patch, 945.patch
>
> Original Estimate: 336h
> Remaining Estimate: 336h
>
> Example:
> SELECT employee_number, name
> FROM employees AS Bob
> WHERE salary > (
> SELECT AVG(salary)
> FROM employees
> WHERE department = Bob.department);
> Basically we can optimize these queries into join queries, like:
> SELECT employees.employee_number, employees.name
> FROM employees INNER JOIN
> (SELECT department, AVG(salary) AS department_average
> FROM employees
> GROUP BY department) AS temp ON employees.department = temp.department
> WHERE employees.salary > temp.department_average;
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