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Posted to issues@spark.apache.org by "Apache Spark (JIRA)" <ji...@apache.org> on 2017/09/27 00:35:00 UTC
[jira] [Assigned] (SPARK-21322) support histogram in filter
cardinality estimation
[ https://issues.apache.org/jira/browse/SPARK-21322?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Apache Spark reassigned SPARK-21322:
------------------------------------
Assignee: Apache Spark
> support histogram in filter cardinality estimation
> --------------------------------------------------
>
> Key: SPARK-21322
> URL: https://issues.apache.org/jira/browse/SPARK-21322
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 2.3.0
> Reporter: Ron Hu
> Assignee: Apache Spark
>
> Histogram is effective in dealing with skewed distribution. After we generate histogram information for column statistics, we need to adjust filter estimation based on histogram data structure.
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