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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