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Posted to issues@hive.apache.org by "Slim Bouguerra (Jira)" <ji...@apache.org> on 2019/12/11 19:19:00 UTC

[jira] [Updated] (HIVE-22629) AST Node Children can be quite expensive to build due to List resizing

     [ https://issues.apache.org/jira/browse/HIVE-22629?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Slim Bouguerra updated HIVE-22629:
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    Attachment: noETLs_ETLs_profile-kc-hdp-mstr06-p.servicemanagement.com-interactive-166620-t-e-cpu-1576029590.svg

> 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: 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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