Ádám Szita created HIVE-25628:
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Summary: 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
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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