Github user SparkQA commented on the issue: https://github.com/apache/spark/pull/20695 **[Test build #87778 has finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/87778/testReport)** for PR 20695 at commit [`488d45a`](https://github.com/apache/spark/commit/488d45aa9cb9c4de96453d1f2c06f83db2b1ef77). * This patch **fails PySpark unit tests**. * This patch merges cleanly. * This patch adds the following public classes _(experimental)_: * `class Summarizer(object):`
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