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https://issues.apache.org/jira/browse/IMPALA-14734?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael Smith resolved IMPALA-14734.
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Fix Version/s: Impala 5.0.0
Resolution: Fixed
> Planning on large iceberg tables can be dominated by sorting
> ------------------------------------------------------------
>
> Key: IMPALA-14734
> URL: https://issues.apache.org/jira/browse/IMPALA-14734
> Project: IMPALA
> Issue Type: Improvement
> Components: Frontend
> Reporter: Csaba Ringhofer
> Priority: Major
> Labels: iceberg, performance
> Fix For: Impala 5.0.0
>
>
> Noticed that planning on large Iceberg tables can be faster when using
> Iceberg's plan files compared to Impala's "optimized" path using cached file
> descriptors. The reason seems to be that planning time is dominated by
> sorting file descriptors, which decodes utf8 pathes in the backing flat
> buffer structure n log ( n ) times
> https://github.com/apache/impala/blob/3be15fd3598071eaeddd9b4d29e0883b95fdd14a/fe/src/main/java/org/apache/impala/planner/IcebergScanNode.java#L116
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