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https://issues.apache.org/jira/browse/SPARK-37226?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Apache Spark reassigned SPARK-37226:
------------------------------------
Assignee: Yuming Wang (was: Apache Spark)
> Filter push down through window
> -------------------------------
>
> Key: SPARK-37226
> URL: https://issues.apache.org/jira/browse/SPARK-37226
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.3.0
> Reporter: Yuming Wang
> Assignee: Yuming Wang
> Priority: Major
>
> {code:scala}
> spark.sql("CREATE TABLE t1 using parquet as select id as a, id as b from
> range(1000)")
> spark.sql("select * from (SELECT a, count(*) cnt, row_number() over (order by
> a desc) as rn from t1 group by a) where rn <= 10").explain(true)
> {code}
> We can optimize this query:
> {noformat}
> == Optimized Logical Plan ==
> Filter (rn#4 <= 10)
> +- Window [row_number() windowspecdefinition(a#7L DESC NULLS LAST,
> specifiedwindowframe(RowFrame, unboundedpreceding$(), currentrow$())) AS
> rn#4], [a#7L DESC NULLS LAST]
> +- GlobalLimit 10
> +- LocalLimit 10
> +- Sort [a#7L DESC NULLS LAST], true
> +- Aggregate [a#7L], [a#7L, count(1) AS cnt#3L]
> +- Project [a#7L]
> +- Relation default.t1[a#7L,b#8L] parquet
> {noformat}
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