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Posted to issues-all@impala.apache.org by "Tim Armstrong (Jira)" <ji...@apache.org> on 2020/06/13 00:09:00 UTC
[jira] [Resolved] (IMPALA-3636) Regression in DecimalOperators::EQ
with codegen disabled
[ https://issues.apache.org/jira/browse/IMPALA-3636?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Tim Armstrong resolved IMPALA-3636.
-----------------------------------
Resolution: Won't Fix
> Regression in DecimalOperators::EQ with codegen disabled
> --------------------------------------------------------
>
> Key: IMPALA-3636
> URL: https://issues.apache.org/jira/browse/IMPALA-3636
> Project: IMPALA
> Issue Type: Improvement
> Components: Backend
> Affects Versions: Impala 2.6.0
> Reporter: Mostafa Mokhtar
> Priority: Minor
> Labels: performance, regression
>
> Some of the decimal improvements that came in Impala 2.6 introduced a regression in the none-codegened path.
> This regression was cause by https://github.com/cloudera/Impala/blob/cdh5-trunk/testdata/workloads/targeted-perf/queries/primitive_orderby_all.test.
> After
> ||Function Stack||CPU Time: Total||
> |impala::DecimalOperators::Eq_DecimalVal_DecimalVal|62.207s|
> | --impala::Expr::GetConstantInt|55.458s|
> | --impala::DecimalValue<long>::Eq|1.480s|
> | --impala::GetDecimal8Value|0.290s|
> | --impala::DecimalValue<__int128>::Eq|0.190s|
>
> Before
> ||Function Stack||CPU Time: Total||
> |impala::DecimalOperators::Eq_DecimalVal_DecimalVal|9.809s|
> | --impala::DecimalValue<long>::Compare|2.300s|
> | --impala_udf::FunctionContext::GetArgType|2.130s|
> | --func@0x812950|0.390s|
> This is a simplified version of the query which can be used as a repro
> {code}
> select *
> FROM (
> SELECT Rank() OVER (
> ORDER BY l_extendedprice
> ,l_quantity
> ,l_discount
> ,l_tax
> ) AS rank
> FROM lineitem
> WHERE l_shipdate < '1992-05-09'
> ) a
> WHERE rank < 10
> {code}
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