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Posted to issues@spark.apache.org by "Apache Spark (Jira)" <ji...@apache.org> on 2021/05/29 00:40:00 UTC
[jira] [Assigned] (SPARK-35558) Avoid redundant computation in
retrieval of approximate quantiles
[ https://issues.apache.org/jira/browse/SPARK-35558?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Apache Spark reassigned SPARK-35558:
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Assignee: (was: Apache Spark)
> Avoid redundant computation in retrieval of approximate quantiles
> -----------------------------------------------------------------
>
> Key: SPARK-35558
> URL: https://issues.apache.org/jira/browse/SPARK-35558
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core
> Affects Versions: 3.1.3
> Reporter: Neoklis
> Priority: Minor
> Original Estimate: 48h
> Remaining Estimate: 48h
>
> QuantileSummaries.query() is called repeatedly to obtain the approximate quantiles (e.g., in approximate_percentiles([0, 0.1, 0.5, 0.9])) but performs redundant computation in each invocation and repeated passes over the quantile sketch. These redundant computations can be eliminated by providing a version of query() that accepts the array of percentiles.
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