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https://issues.apache.org/jira/browse/SPARK-38179?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chao Sun resolved SPARK-38179.
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Resolution: Won't Fix
> Improve WritableColumnVector to better support null struct
> ----------------------------------------------------------
>
> Key: SPARK-38179
> URL: https://issues.apache.org/jira/browse/SPARK-38179
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 3.3.0
> Reporter: Chao Sun
> Priority: Minor
>
> Currently {{WritableColumnVector}} of struct type requires to allocate space
> in all child vectors for null elements. This is not very space efficient. In
> addition, this model doesn't work well with Parquet vectorized scan for
> struct (in SPARK-34863).
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