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Posted to issues@spark.apache.org by "Yesheng Ma (Jira)" <ji...@apache.org> on 2025/09/17 20:47:00 UTC

[jira] [Commented] (SPARK-53623) O(N^2) operation in readLargeTableProp in CatalogColumnStat

    [ https://issues.apache.org/jira/browse/SPARK-53623?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18020982#comment-18020982 ] 

Yesheng Ma commented on SPARK-53623:
------------------------------------

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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