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https://issues.apache.org/jira/browse/TAJO-774?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14047068#comment-14047068
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ASF GitHub Bot commented on TAJO-774:
-------------------------------------
Github user jihoonson commented on the pull request:
https://github.com/apache/tajo/pull/13#issuecomment-47447648
Hi Hyunsik,
I found that the following query emits an error.
```
default> select l_orderkey, l_quantity, rank() over (partition by
l_orderkey) from lineitem
ERROR: java.lang.NullPointerException
```
> Implement logical plan part and physical executor for window function.
> ----------------------------------------------------------------------
>
> Key: TAJO-774
> URL: https://issues.apache.org/jira/browse/TAJO-774
> Project: Tajo
> Issue Type: Sub-task
> Components: planner/optimizer
> Reporter: Hyunsik Choi
> Assignee: Hyunsik Choi
> Fix For: 0.9.0
>
>
> See the title. The main objective of this issue is to implement the logical
> planning part for window function support.
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