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https://issues.apache.org/jira/browse/SPARK-22515?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xiao Li resolved SPARK-22515.
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Resolution: Fixed
Assignee: Zhenhua Wang
Fix Version/s: 2.3.0
> Estimation relation size based on numRows * rowSize
> ---------------------------------------------------
>
> Key: SPARK-22515
> URL: https://issues.apache.org/jira/browse/SPARK-22515
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 2.3.0
> Reporter: Zhenhua Wang
> Assignee: Zhenhua Wang
> Fix For: 2.3.0
>
>
> Currently, relation size is computed as the sum of file size, which is
> error-prone because storage format like parquet may have a much smaller file
> size compared to in-memory size. When we choose broadcast join based on file
> size, there's a risk of OOM. But if the number of rows is available in
> statistics, we can get a better estimation by `numRows * rowSize`, which
> helps to alleviate this problem.
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