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Posted to issues@spark.apache.org by "jiaan.geng (Jira)" <ji...@apache.org> on 2020/10/13 08:07:00 UTC

[jira] [Created] (SPARK-33126) Improve offset window function(Remove direction field)

jiaan.geng created SPARK-33126:
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             Summary: Improve offset window function(Remove direction field)
                 Key: SPARK-33126
                 URL: https://issues.apache.org/jira/browse/SPARK-33126
             Project: Spark
          Issue Type: Sub-task
          Components: SQL
    Affects Versions: 3.1.0
            Reporter: jiaan.geng


The current Lead/Lag extends OffsetWindowFunction. OffsetWindowFunction contains field direction and use direction to calculate the boundary.
We can use single literal expression unify the two properties.
For example:
 3 means direction is Asc and boundary is 3.
 -3 means direction is Desc and boundary is -3.



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