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https://issues.apache.org/jira/browse/IMPALA-7557?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Csaba Ringhofer resolved IMPALA-7557.
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Resolution: Done
> Optimize local time functions for the UTC case
> ----------------------------------------------
>
> Key: IMPALA-7557
> URL: https://issues.apache.org/jira/browse/IMPALA-7557
> Project: IMPALA
> Issue Type: Improvement
> Components: Backend
> Reporter: Csaba Ringhofer
> Priority: Minor
> Labels: timestamp, timezone
>
> Currently two flags decide whether to do UTZ->local timezone conversions
> - convert_legacy_hive_parquet_utc_timestamps
> - use_local_tz_for_unix_timestamp_conversions
> Enabling these global flags make Impala more compatible with Hive, but can
> highly degrade performance. Since IMPALA-7362, it is possible to override the
> local timezone with a query option. Setting timezone to UTC practically
> disables the flags above, but their overhead does not disappear completely.
> It would be relatively easy to create shortcuts for the UTC case to avoid
> this overhead.
> This could make it easier to choose the right values for the flags: both
> could be set to true, and users who want to avoid the performance impact
> could switch to UTC.
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