[ https://issues.apache.org/jira/browse/SPARK-15748?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Reynold Xin updated SPARK-15748: -------------------------------- Issue Type: Sub-task (was: Improvement) Parent: SPARK-15852 > Replace inefficient foldLeft() call in PartitionStatistics > ---------------------------------------------------------- > > Key: SPARK-15748 > URL: https://issues.apache.org/jira/browse/SPARK-15748 > Project: Spark > Issue Type: Sub-task > Components: SQL > Reporter: Josh Rosen > Assignee: Josh Rosen > Fix For: 2.0.0 > > > 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. -- This message was sent by Atlassian JIRA (v6.3.4#6332) --------------------------------------------------------------------- To unsubscribe, e-mail: issues-unsubscr...@spark.apache.org For additional commands, e-mail: issues-h...@spark.apache.org