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https://issues.apache.org/jira/browse/SPARK-30338?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wenchen Fan resolved SPARK-30338.
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Fix Version/s: 3.0.0
Resolution: Fixed
Issue resolved by pull request 26993
[https://github.com/apache/spark/pull/26993]
> Avoid unnecessary InternalRow copies in ParquetRowConverter
> -----------------------------------------------------------
>
> Key: SPARK-30338
> URL: https://issues.apache.org/jira/browse/SPARK-30338
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.0.0
> Reporter: Josh Rosen
> Assignee: Josh Rosen
> Priority: Major
> Fix For: 3.0.0
>
>
> ParquetRowConverter calls {{InternalRow.copy()}} in cases where the copy is
> unnecessary; this can severely harm performance when reading deeply-nested
> Parquet.
> It looks like this copying was originally added to handle arrays and maps of
> structs (in which case we need to keep the copying), but we can omit it for
> the more common case of structs nested directly in structs.
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