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https://issues.apache.org/jira/browse/SPARK-48587?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wenchen Fan resolved SPARK-48587.
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Fix Version/s: 4.0.0
Resolution: Fixed
Issue resolved by pull request 46941
[https://github.com/apache/spark/pull/46941]
> Avoid storage amplification when accessing sub-Variant
> ------------------------------------------------------
>
> Key: SPARK-48587
> URL: https://issues.apache.org/jira/browse/SPARK-48587
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 4.0.0
> Reporter: David Cashman
> Assignee: David Cashman
> Priority: Major
> Labels: pull-request-available
> Fix For: 4.0.0
>
>
> When a variant_get expression returns a Variant, or a nested type containing
> Variant, we just return the sub-slice of the Variant value along with the
> full metadata, even though most of the metadata is probably unnecessary to
> represent the value. This may be very inefficient if the value is then
> written to disk (e.g. shuffle file or parquet). We should instead rebuild the
> value with minimal metadata.
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