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https://issues.apache.org/jira/browse/HIVE-17139?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ke Jia reopened HIVE-17139:
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> Conditional expressions optimization: skip the expression evaluation if the
> condition is not satisfied for vectorization engine.
> --------------------------------------------------------------------------------------------------------------------------------
>
> Key: HIVE-17139
> URL: https://issues.apache.org/jira/browse/HIVE-17139
> Project: Hive
> Issue Type: Improvement
> Reporter: Ke Jia
> Assignee: Ke Jia
> Priority: Major
> Fix For: 3.0.0
>
> Attachments: HIVE-17139.1.patch, HIVE-17139.10.patch,
> HIVE-17139.11.patch, HIVE-17139.12.patch, HIVE-17139.13.patch,
> HIVE-17139.13.patch, HIVE-17139.14.patch, HIVE-17139.15.patch,
> HIVE-17139.16.patch, HIVE-17139.17.patch, HIVE-17139.18.patch,
> HIVE-17139.18.patch, HIVE-17139.19.patch, HIVE-17139.2.patch,
> HIVE-17139.20.patch, HIVE-17139.3.patch, HIVE-17139.4.patch,
> HIVE-17139.5.patch, HIVE-17139.6.patch, HIVE-17139.7.patch,
> HIVE-17139.8.patch, HIVE-17139.9.patch
>
>
> The case when and if statement execution for Hive vectorization is not
> optimal, which all the conditional and else expressions are evaluated for
> current implementation. The optimized approach is to update the selected
> array of batch parameter after the conditional expression is executed. Then
> the else expression will only do the selected rows instead of all.
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