[jira] [Created] (IMPALA-12088) Make the predicate pushdown skipping improvement work with the count(*) query rewrite improvement

["Gabor Kaszab (Jira)" <ji...@apache.org>]

Gabor Kaszab created IMPALA-12088:
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             Summary: 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


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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