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https://issues.apache.org/jira/browse/SPARK-37896?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17482117#comment-17482117
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Apache Spark commented on SPARK-37896:
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User 'c21' has created a pull request for this issue:
https://github.com/apache/spark/pull/35324
> ConstantColumnVector: a column vector with same values
> ------------------------------------------------------
>
> Key: SPARK-37896
> URL: https://issues.apache.org/jira/browse/SPARK-37896
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.2.0
> Reporter: Yaohua Zhao
> Assignee: Yaohua Zhao
> Priority: Major
> Fix For: 3.3.0
>
>
> Introduce a new column vector named `ConstantColumnVector`, it represents a
> column vector where every row has the same constant value.
> It could help improve performance on hidden file metadata columnar file
> format, since metadata fields for every row in each file are exactly the
> same, we don't need to copy and keep multiple copies of data.
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