[SPARK-23889] DataSourceV2: Add interfaces to pass required sorting and clustering for writes - ASF JIRA

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Details

Type: Sub-task
Status: Resolved
Priority: Major
Resolution: Implemented
Affects Version/s: 2.3.0
Fix Version/s: None
Component/s: SQL
Labels:
None

Description

From a discussion on the dev list, there is consensus around adding interfaces to pass required sorting and clustering to Spark. The proposal is to add:

interface RequiresClustering {
  Set<Expression> requiredClustering();
}

interface RequiresSort {
  List<SortOrder> requiredOrdering();
}

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.