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https://issues.apache.org/jira/browse/SPARK-4829?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14242413#comment-14242413
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Apache Spark commented on SPARK-4829:
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User 'adrian-wang' has created a pull request for this issue:
https://github.com/apache/spark/pull/3676
> eliminate expressions calculation in count expression
> -----------------------------------------------------
>
> Key: SPARK-4829
> URL: https://issues.apache.org/jira/browse/SPARK-4829
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Reporter: Adrian Wang
>
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