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https://issues.apache.org/jira/browse/SPARK-52588?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17993138#comment-17993138
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Nikita Awasthi commented on SPARK-52588:
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User 'yhuang-db' has created a pull request for this issue:
https://github.com/apache/spark/pull/51308
> Add approx_top_k functions: accumulate, combine, estimate
> ---------------------------------------------------------
>
> Key: SPARK-52588
> URL: https://issues.apache.org/jira/browse/SPARK-52588
> Project: Spark
> Issue Type: New Feature
> Components: SQL
> Affects Versions: 4.1.0
> Reporter: Yuchuan Huang
> Priority: Major
>
> Following:
> [https://issues.apache.org/jira/projects/SPARK/issues/SPARK-52515], which
> added the SQL function: approx_top_k.
>
> This ticket adds its sibling functions:
> * approx_top_k_accumulate: aggregation function, generates the intermediate
> sketch status of a column.
> * approx_top_k_combine: aggregation function, merges multiple intermediate
> sketch status into one.
> * approx_top_k_estimate: expression function, returns the top_k result from
> an intermediate sketch status.
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