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https://issues.apache.org/jira/browse/HIVE-4727?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sarvesh Sakalanaga updated HIVE-4727:
-------------------------------------
Attachment: Hive-4727.0.patch
Patch available.
> Optimize ORC StringTreeReader::nextVector to not create dictionary of strings
> for each call to nextVector
> ---------------------------------------------------------------------------------------------------------
>
> Key: HIVE-4727
> URL: https://issues.apache.org/jira/browse/HIVE-4727
> Project: Hive
> Issue Type: Sub-task
> Reporter: Sarvesh Sakalanaga
> Assignee: Sarvesh Sakalanaga
> Priority: Minor
> Attachments: Hive-4727.0.patch
>
>
> Currently ORC StringTreeReader::nextVector creates dictionary of strings for
> each call to nextVector. This leads to bad perf as there is huge memory
> allocation and deallocation on each call. Since the dictionary does not
> change within a stripe, StringTreeReader::nextVector should be optimized to
> create this dictionary only on stripe read.
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