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Posted to issues@spark.apache.org by "Josh Rosen (JIRA)" <ji...@apache.org> on 2016/06/03 05:46:59 UTC

[jira] [Created] (SPARK-15748) Replace inefficient foldLeft() call in PartitionStatistics

Josh Rosen created SPARK-15748:
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             Summary: 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: Josh Rosen


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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