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https://issues.apache.org/jira/browse/SPARK-8419?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14595048#comment-14595048
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Kai Sasaki commented on SPARK-8419:
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In the {{Statistics#colStats}}, the number of rows seems to be updated in
{{computeColumnSummaryStatistics}} with {{updateNumRows}}. This is computed
through distributed process which is calculated inside of
{{RDD#treeAggregate}}. So I think there is no extra {{count()}} when just only
creating {{RowMatrix}}. Is this assumption correct?
> Statistics.colStats could avoid an extra count()
> ------------------------------------------------
>
> Key: SPARK-8419
> URL: https://issues.apache.org/jira/browse/SPARK-8419
> Project: Spark
> Issue Type: Improvement
> Components: MLlib
> Reporter: Joseph K. Bradley
> Priority: Trivial
> Labels: starter
>
> Statistics.colStats goes through RowMatrix to compute the stats. But
> RowMatrix.computeColumnSummaryStatistics does an extra count() which could be
> avoided. Not going through RowMatrix would skip this extra pass over the
> data.
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