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https://issues.apache.org/jira/browse/SPARK-13113?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15126368#comment-15126368
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Apache Spark commented on SPARK-13113:
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User 'viirya' has created a pull request for this issue:
https://github.com/apache/spark/pull/11002
> Remove unnecessary bit operation when decoding page number
> ----------------------------------------------------------
>
> Key: SPARK-13113
> URL: https://issues.apache.org/jira/browse/SPARK-13113
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core
> Reporter: Liang-Chi Hsieh
> Priority: Minor
>
> As we shift bits right when decoding page number, looks like the bitwise AND
> operation is unnecessary.
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