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https://issues.apache.org/jira/browse/SPARK-30712?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17032066#comment-17032066
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liupengcheng commented on SPARK-30712:
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OK, thanks! [~hyukjin.kwon].
> Estimate sizeInBytes from file metadata for parquet files
> ---------------------------------------------------------
>
> Key: SPARK-30712
> URL: https://issues.apache.org/jira/browse/SPARK-30712
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.1.0
> Reporter: liupengcheng
> Priority: Major
>
> Currently, Spark will use a compressionFactor when calculating `sizeInBytes`
> for `HadoopFsRelation`, but this is not accurate and it's hard to choose the
> best `compressionFactor`. Sometimes, this can causing OOMs due to improper
> BroadcastHashJoin.
> So I propose to use the rowCount in the BlockMetadata to estimate the size in
> memory, which can be more accurate.
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