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https://issues.apache.org/jira/browse/HIVE-23194?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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David Mollitor reassigned HIVE-23194:
-------------------------------------
> Use Queue Instead of List for CollectOperator
> ---------------------------------------------
>
> Key: HIVE-23194
> URL: https://issues.apache.org/jira/browse/HIVE-23194
> Project: Hive
> Issue Type: Improvement
> Reporter: David Mollitor
> Assignee: David Mollitor
> Priority: Minor
>
> https://github.com/apache/hive/blob/d6948a28ab3e34e5116591a60a96bdf031185e47/ql/src/java/org/apache/hadoop/hive/ql/exec/CollectOperator.java#L85-L88
> {code:java|title=CollectOperator.java}
> rowList = new ArrayList<Object>();
> ...
> } else {
> result.o = rowList.remove(0);
> result.oi = standardRowInspector;
> }
> {code}
> Removing from the head of an {{ArrayList}} is an expensive operation because
> it needs to shift all of the elements down in the array for each call.
> Better to use a {{Queue}}
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