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Posted to issues@spark.apache.org by "Chao Sun (Jira)" <ji...@apache.org> on 2021/10/22 16:45:00 UTC

[jira] [Updated] (SPARK-35703) Relax constraint for Spark bucket join and remove HashClusteredDistribution

     [ https://issues.apache.org/jira/browse/SPARK-35703?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Chao Sun updated SPARK-35703:
-----------------------------
    Summary: Relax constraint for Spark bucket join and remove HashClusteredDistribution  (was: Remove HashClusteredDistribution)

> Relax constraint for Spark bucket join and remove HashClusteredDistribution
> ---------------------------------------------------------------------------
>
>                 Key: SPARK-35703
>                 URL: https://issues.apache.org/jira/browse/SPARK-35703
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 3.2.0
>            Reporter: Chao Sun
>            Priority: Major
>
> Currently Spark has {{HashClusteredDistribution}} and {{ClusteredDistribution}}. The only difference between the two is that the former is more strict when deciding whether bucket join is allowed to avoid shuffle: comparing to the latter, it requires *exact* match between the clustering keys from the output partitioning (i.e., {{HashPartitioning}}) and the join keys. However, this is unnecessary, as we should be able to avoid shuffle when the set of clustering keys is a subset of join keys, just like {{ClusteredDistribution}}. 



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