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Posted to issues-all@impala.apache.org by "bharath v (JIRA)" <ji...@apache.org> on 2018/12/08 01:11:00 UTC
[jira] [Resolved] (IMPALA-7497) Consider reintroducing numNulls
count in compute stats
[ https://issues.apache.org/jira/browse/IMPALA-7497?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
bharath v resolved IMPALA-7497.
-------------------------------
Resolution: Fixed
Assignee: bharath v
Fix Version/s: Impala 3.2.0
> Consider reintroducing numNulls count in compute stats
> ------------------------------------------------------
>
> Key: IMPALA-7497
> URL: https://issues.apache.org/jira/browse/IMPALA-7497
> Project: IMPALA
> Issue Type: Improvement
> Components: Frontend
> Affects Versions: Impala 3.0, Impala 2.12.0, Impala 3.1.0
> Reporter: Balazs Jeszenszky
> Assignee: bharath v
> Priority: Major
> Fix For: Impala 3.2.0
>
>
> IMPALA-1003 disabled numNulls calculations for performance reasons. A lot has changed since, it'd be good to reevaluate computing numNulls. The planner still has some code that uses it for cardinality estimations, so just adding it back to compute stats can lead to easy wins.
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