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https://issues.apache.org/jira/browse/SPARK-17359?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen resolved SPARK-17359.
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Resolution: Fixed
Fix Version/s: 2.1.0
Issue resolved by pull request 14914
[https://github.com/apache/spark/pull/14914]
> Use +=(A) instead of append(A) in performance critical paths
> ------------------------------------------------------------
>
> Key: SPARK-17359
> URL: https://issues.apache.org/jira/browse/SPARK-17359
> Project: Spark
> Issue Type: Improvement
> Components: MLlib, SQL
> Affects Versions: 2.0.0
> Reporter: Liwei Lin
> Priority: Minor
> Fix For: 2.1.0
>
>
> We should generally use ArrayBuffer.+=(A) rather than ArrayBuffer.append(A),
> because append(A) would involve extra boxing / unboxing.
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