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https://issues.apache.org/jira/browse/SPARK-21322?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16258601#comment-16258601
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Ron Hu edited comment on SPARK-21322 at 11/21/17 1:43 AM:
----------------------------------------------------------
Pull request 19357 was created while there were several dependencies that had
not been merged yet at that time. As a result, it has caused many conflicts. I
decided to close pull request 19357 and start a clean one. Please review the
new pull request 19783 instead. Thanks.
was (Author: ron8hu):
Pull request 19357 was created while there were several dependencies that had
not been defined yet at that time. As a result, it has caused many conflicts. I
decided to close pull request 19357 and start a clean one. Please review the
new pull request 19783 instead. Thanks.
> 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
>
> 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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