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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