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https://issues.apache.org/jira/browse/SPARK-17188?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15431179#comment-15431179
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Apache Spark commented on SPARK-17188:
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User 'clockfly' has created a pull request for this issue:
https://github.com/apache/spark/pull/14754
> Moves QuantileSummaries to project catalyst from sql so that it can be used
> to implement percentile_approx
> ----------------------------------------------------------------------------------------------------------
>
> Key: SPARK-17188
> URL: https://issues.apache.org/jira/browse/SPARK-17188
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Reporter: Sean Zhong
>
> QuantileSummaries is a useful utility class to do statistics. It can be used
> by aggregation function like percentile_approx.
> Currently, QuantileSummaries is located at project catalyst in package
> org.apache.spark.sql.execution.stat, probably, we should move it to project
> catalyst package org.apache.spark.sql.util.
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