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https://issues.apache.org/jira/browse/SPARK-22359?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16290964#comment-16290964
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Attila Zsolt Piros commented on SPARK-22359:
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I would like to join and take the subtask SPARK-22362.
> Improve the test coverage of window functions
> ---------------------------------------------
>
> Key: SPARK-22359
> URL: https://issues.apache.org/jira/browse/SPARK-22359
> Project: Spark
> Issue Type: Test
> Components: SQL
> Affects Versions: 2.3.0
> Reporter: Jiang Xingbo
>
> There are already quite a few integration tests using window functions, but
> the unit tests coverage for window funtions is not ideal.
> We'd like to test the following aspects:
> * Specifications
> ** different partition clauses (none, one, multiple)
> ** different order clauses (none, one, multiple, asc/desc, nulls first/last)
> * Frames and their combinations
> ** OffsetWindowFunctionFrame
> ** UnboundedWindowFunctionFrame
> ** SlidingWindowFunctionFrame
> ** UnboundedPrecedingWindowFunctionFrame
> ** UnboundedFollowingWindowFunctionFrame
> * Aggregate function types
> ** Declarative
> ** Imperative
> ** UDAF
> * Spilling
> ** Cover the conditions that WindowExec should spill at least once
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