Jiang Xingbo created SPARK-22359:
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             Summary: 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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