Reynold Xin created SPARK-9577:
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Summary: Surface concrete iterator types in various sort classes
Key: SPARK-9577
URL: https://issues.apache.org/jira/browse/SPARK-9577
Project: Spark
Issue Type: Sub-task
Components: SQL
Reporter: Reynold Xin
Assignee: Reynold Xin
We often return abstract iterator types in various sort-related classes (e.g.
UnsafeKVExternalSorter).
It is actually better to return a more concrete type, so the callsite uses that
type and JIT can inline the iterator calls.
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