Ryan Blue created SPARK-23889:
---------------------------------
Summary: 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
>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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