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https://issues.apache.org/jira/browse/SPARK-53623?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18020982#comment-18020982
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Yesheng Ma commented on SPARK-53623:
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I'll put a PR for this shortly.
> O(N^2) operation in readLargeTableProp in CatalogColumnStat
> -----------------------------------------------------------
>
> Key: SPARK-53623
> URL: https://issues.apache.org/jira/browse/SPARK-53623
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 4.0.1
> Reporter: Yesheng Ma
> Priority: Major
>
> The CatalogColumnStat.readLargeTableProp
> [https://github.com/apache/spark/blob/master/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/catalog/interface.scala#L766-L784]
> is an O(N) operation. Considering a table can have a lot of table
> properties, this effectively becomes an O(N^2) operation, which can be very
> slow for tables with a lot of table properties.
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