[jira] [Resolved] (IMPALA-11591) Avoid calling planFiles() on Iceberg tables when there are no predicates

["Zoltán Borók-Nagy (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IMPALA-11591?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Zoltán Borók-Nagy resolved IMPALA-11591.
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    Fix Version/s: Impala 4.2.0
       Resolution: Fixed

> 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
>            Assignee: Zoltán Borók-Nagy
>            Priority: Major
>              Labels: impala-iceberg
>             Fix For: Impala 4.2.0
>
>
> 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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