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https://issues.apache.org/jira/browse/HIVE-24154?focusedWorklogId=483660&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-483660
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ASF GitHub Bot logged work on HIVE-24154:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 13/Sep/20 16:03
Start Date: 13/Sep/20 16:03
Worklog Time Spent: 10m
Work Description: jcamachor commented on a change in pull request #1492:
URL: https://github.com/apache/hive/pull/1492#discussion_r487546646
##########
File path:
ql/src/test/results/clientpositive/perf/tez/constraints/cbo_query74.q.out
##########
@@ -147,7 +147,7 @@ HiveSortLimit(sort0=[$2], sort1=[$0], sort2=[$1],
dir0=[ASC], dir1=[ASC], dir2=[
HiveProject(ss_sold_date_sk=[$0],
ss_customer_sk=[$3], ss_net_paid=[$20])
HiveTableScan(table=[[default, store_sales]],
table:alias=[store_sales])
HiveProject(d_date_sk=[$0])
- HiveFilter(condition=[AND(=($1, 1999), IN($1, 1998,
1999))])
+ HiveFilter(condition=[=($1, 1999)])
Review comment:
What seems to happen is that we close these IN clauses before we call
the join propagation rule, which leads to the inference of new predicates. Then
the RexSimplify does not deal with the IN+EQUALS clauses and the
HivePointLookup cannot deal with the EQUALS.
We could possibly change the rules order too but I was not brave enough to
do that :) Plus I think supporting the degenerate case of EQUALS in
HivePointLookup should be fine.
Iirc there is work going on in Calcite to finally have more extensive
support for IN in RexSimplify, which you suggested some time ago... I hope that
work goes in and we can simplify this whole code path.
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Issue Time Tracking
-------------------
Worklog Id: (was: 483660)
Time Spent: 40m (was: 0.5h)
> Missing simplification opportunity with IN and EQUALS clauses
> -------------------------------------------------------------
>
> Key: HIVE-24154
> URL: https://issues.apache.org/jira/browse/HIVE-24154
> Project: Hive
> Issue Type: Improvement
> Components: CBO
> Reporter: Jesus Camacho Rodriguez
> Assignee: Jesus Camacho Rodriguez
> Priority: Minor
> Labels: pull-request-available
> Time Spent: 40m
> Remaining Estimate: 0h
>
> For instance, in perf driver CBO query 74, there are several filters that
> could be simplified further:
> {code}
> HiveFilter(condition=[AND(=($1, 1999), IN($1, 1998, 1999))])
> {code}
> This may lead to incorrect estimates and leads to unnecessary execution time.
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