jin xing created SPARK-21315:
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Summary: Skip some spill files when generateIterator(startIndex)
in ExternalAppendOnlyUnsafeRowArray.
Key: SPARK-21315
URL: https://issues.apache.org/jira/browse/SPARK-21315
Project: Spark
Issue Type: Improvement
Components: SQL
Affects Versions: 2.1.1
Reporter: jin xing
In current code, it is expensive to use
{{UnboundedFollowingWindowFunctionFrame}}, because it is iterating from the
start to lower bound every time calling {{write}} method. When traverse the
iterator, it's possible to skip some spilled files thus to same some time.
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