eaton created SPARK-27320:
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Summary: Converting seq to array in AggregationIterator to improve
its access performance
Key: SPARK-27320
URL: https://issues.apache.org/jira/browse/SPARK-27320
Project: Spark
Issue Type: Improvement
Components: SQL
Affects Versions: 2.4.0
Reporter: eaton
In AggregationIterator's loop function, we access the expressions by
`expressions(i)`, the type of `expressions` is `::`, a subtype of list.
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