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https://issues.apache.org/jira/browse/HIVE-25628?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ádám Szita reassigned HIVE-25628:
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> Avoid unnecessary file ops if Iceberg table is LLAP cached
> ----------------------------------------------------------
>
> Key: HIVE-25628
> URL: https://issues.apache.org/jira/browse/HIVE-25628
> Project: Hive
> Issue Type: Improvement
> Components: llap
> Reporter: Ádám Szita
> Assignee: Ádám Szita
> Priority: Major
>
> In case the query execution is vectorized for an Iceberg table, we need to
> make an extra file open operation on the ORC file to learn what the file
> schema is (to be matched later with the logical schema).
> In LLAP configuration the file schema could be retrieved through LLAP cache
> as ORC metadata is cached, so we should avoid the file operation when
> possible.
> Also: LLAP relies on cache keys that are usually triplets of file information
> and is constructed by an FS.listStatus call. For iceberg tables we should
> rely on such file information provided by Iceberg's metadata to spare this
> call too.
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