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From "Ryan Blue (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (SPARK-23889) DataSourceV2: Add interfaces to pass required sorting and clustering for writes
Date Fri, 06 Apr 2018 16:43:00 GMT

     [ https://issues.apache.org/jira/browse/SPARK-23889?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ryan Blue updated SPARK-23889:
------------------------------
    Summary: DataSourceV2: Add interfaces to pass required sorting and clustering for writes
 (was: Add interfaces to pass required sorting and clustering for writes)

> 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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