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