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From "Apache Spark (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (SPARK-15748) Replace inefficient foldLeft() call in PartitionStatistics
Date Fri, 03 Jun 2016 05:49:59 GMT

     [ https://issues.apache.org/jira/browse/SPARK-15748?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Apache Spark reassigned SPARK-15748:
------------------------------------

    Assignee: Apache Spark  (was: Josh Rosen)

> Replace inefficient foldLeft() call in PartitionStatistics
> ----------------------------------------------------------
>
>                 Key: SPARK-15748
>                 URL: https://issues.apache.org/jira/browse/SPARK-15748
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>            Reporter: Josh Rosen
>            Assignee: Apache Spark
>
> PartitionStatistics uses foldLeft and list concatenation to flatten an iterator of lists,
but this is extremely inefficient compared to simply doing flatMap/flatten because it performs
many unnecessary object allocations. Simply replacing this foldLeft by a flatMap results in
fair performance gains when constructing PartitionStatistics instances for tables with many
columns.



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