[jira] [Created] (SPARK-41805) Reuse expressions in WindowSpecDefinition

["Wan Kun (Jira)" <ji...@apache.org>]

Wan Kun created SPARK-41805:
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             Summary: Reuse expressions in WindowSpecDefinition
                 Key: SPARK-41805
                 URL: https://issues.apache.org/jira/browse/SPARK-41805
             Project: Spark
          Issue Type: Improvement
          Components: SQL
    Affects Versions: 3.4.0
            Reporter: Wan Kun


For complex expressions in window spec definition, we extract it and replace it with an AttributeReference (with an internal column name, e.g. "_w0").
We can reuse the extracted expressions to avoid generator unnecessary Window node.

For example: the logical plan of query
{code:sql}
SELECT max(value) over(partition by (key) order by cast(ts as timestamp)) as w1,
               min(value) over(partition by (key) order by cast(ts as timestamp)) as w2
FROM t1
{code}
contains two Window node.




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