Zoltán Borók-Nagy created IMPALA-11591:
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Summary: Avoid calling planFiles() on Iceberg tables when there
are no predicates
Key: IMPALA-11591
URL: https://issues.apache.org/jira/browse/IMPALA-11591
Project: IMPALA
Issue Type: Improvement
Reporter: Zoltán Borók-Nagy
Currently we always invoke Iceberg's planFiles() API for creating Iceberg scans.
When there are no predicates (and no time travel) on the table we could avoid
that because we already cache everything we need (schema, partition
information, file descriptors).
We can also consider only pushing down predicates if at least one of the
predicates refer to a partition column. Otherwise it's possible that the
overhead of reading, decoding, evaluating all the manifest files is too large.
I think the change should be fairly simple, we just need to take care:
* store delete files separately, so we can still do the V2 scans from cache
* During time-travel we also cache old file descriptors, so we need to
separate them from the actual snapshot's file descriptors.
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