[jira] [Commented] (SPARK-23889) DataSourceV2: Add interfaces to pass required sorting and clustering for writes

["Apache Spark (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-23889?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17247189#comment-17247189 ] 

Apache Spark commented on SPARK-23889:
--------------------------------------

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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