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https://issues.apache.org/jira/browse/SPARK-20678?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wenchen Fan resolved SPARK-20678.
---------------------------------
Resolution: Fixed
Fix Version/s: 2.3.0
2.2.1
Issue resolved by pull request 17918
[https://github.com/apache/spark/pull/17918]
> Ndv for columns not in filter condition should also be updated
> --------------------------------------------------------------
>
> Key: SPARK-20678
> URL: https://issues.apache.org/jira/browse/SPARK-20678
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 2.2.0
> Reporter: Zhenhua Wang
> Fix For: 2.2.1, 2.3.0
>
>
> In filter estimation, we update column stats for those columns in filter
> condition. However, if the number of rows decreases after the filter (i.e.
> the overall selectivity is less than 1), we need to update (scale down) the
> number of distinct values (NDV) for all columns, no matter they are in filter
> conditions or not.
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