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https://issues.apache.org/jira/browse/IMPALA-12088?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Boglarka Egyed reassigned IMPALA-12088:
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Assignee: Peter Rozsa
> Make the predicate pushdown skipping improvement work with the count(*) query
> rewrite improvement
> -------------------------------------------------------------------------------------------------
>
> Key: IMPALA-12088
> URL: https://issues.apache.org/jira/browse/IMPALA-12088
> Project: IMPALA
> Issue Type: Sub-task
> Components: Frontend
> Reporter: Gabor Kaszab
> Assignee: Peter Rozsa
> Priority: Major
> Labels: impala-iceberg, performance
>
> https://issues.apache.org/jira/browse/IMPALA-11802 introduced a query rewrite
> for count(*) queries on Iceberg tables as a performance improvement. Later on
> https://issues.apache.org/jira/browse/IMPALA-11701 introduced the capability
> to skip pushing down predicates to Impala scanners when Iceberg applied it
> and won't filter any further rows.
> This ticket is to make a connection between these 2 improvements: When we
> skip pushing down predicates and there is no more predicates to push down and
> this is a count(*) query then let's do the query rewrite from IMPALA-11802.
> One difficulty implementing this is that the query rewrite is done in the
> analysis phase while the predicate pushdown decision is made in the planner
> phase so might be a bit more complicated than to re-use the rewrite code.
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