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https://issues.apache.org/jira/browse/SPARK-23889?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17247189#comment-17247189
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Apache Spark commented on SPARK-23889:
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User 'aokolnychyi' has created a pull request for this issue:
https://github.com/apache/spark/pull/30706
> DataSourceV2: Add interfaces to pass required sorting and clustering for
> writes
> -------------------------------------------------------------------------------
>
> Key: SPARK-23889
> URL: https://issues.apache.org/jira/browse/SPARK-23889
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 2.3.0
> Reporter: Ryan Blue
> Priority: Major
>
> From a [discussion on the dev
> list|https://lists.apache.org/thread.html/d8bb72fc9b4be8acc3f49367bfc99cbf029194a58333eba69df49717@%3Cdev.spark.apache.org%3E],
> there is consensus around adding interfaces to pass required sorting and
> clustering to Spark. The proposal is to add:
> {code:java}
> interface RequiresClustering {
> Set<Expression> requiredClustering();
> }
> interface RequiresSort {
> List<SortOrder> requiredOrdering();
> }
> {code}
> When only {{RequiresSort}} is present, the sort would produce a global sort.
> The partitioning introduced by that sort would be overridden by
> {{RequiresClustering}}, making the sort local to each partition.
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