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https://issues.apache.org/jira/browse/HIVE-22629?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16993886#comment-16993886
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Slim Bouguerra commented on HIVE-22629:
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[~belugabehr] what you are saying make sense, but that is out of scope of this
patch.
You need to dive deep and see if this list is mutated later and what null is
used for...
> AST Node Children can be quite expensive to build due to List resizing
> ----------------------------------------------------------------------
>
> Key: HIVE-22629
> URL: https://issues.apache.org/jira/browse/HIVE-22629
> Project: Hive
> Issue Type: Improvement
> Reporter: Slim Bouguerra
> Assignee: Slim Bouguerra
> Priority: Major
> Attachments: HIVE-22629.1.patch, HIVE-22629.patch,
> noETLs_ETLs_profile-kc-hdp-mstr06-p.servicemanagement.com-interactive-166620-t-e-cpu-1576029590.svg
>
>
> As per the attached profile, The AST Node can be a major source of CPU and
> memory churn, due to the ArrayList resizing and copy.
> In my Opinion this can be amortized by providing the actual size.
> [~jcamachorodriguez] / [~vgarg]
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