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https://issues.apache.org/jira/browse/IMPALA-8566?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Todd Lipcon resolved IMPALA-8566.
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Resolution: Fixed
Fix Version/s: Impala 3.3.0
> COMPUTE INCREMENTAL STATS sets num_nulls off-by-one
> ---------------------------------------------------
>
> Key: IMPALA-8566
> URL: https://issues.apache.org/jira/browse/IMPALA-8566
> Project: IMPALA
> Issue Type: Bug
> Components: Backend
> Affects Versions: Impala 3.2.0
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Priority: Major
> Fix For: Impala 3.3.0
>
>
> IMPALA-7659 added the population of NULL counts while computing stats, but
> this functionality isn't working properly for incremental stats. The query is
> produced correctly, but the null count set in the table is one lower than it
> should be. In the case that the table has no nulls, this ends up setting a
> '-1' count, which is interpreted as 'unknown'. In the case that there are
> nulls, we'll just be a little inaccurate.
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