Github user SparkQA commented on the issue:
https://github.com/apache/spark/pull/19479
**[Test build #83614 has
finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/83614/testReport)**
for PR 19479 at commit
[`72840a9`](https://github.com/apache/spark/commit/72840a93e0890919827d33415d1ab4e0e0ccc1f4).
* This patch passes all tests.
* This patch merges cleanly.
* This patch adds the following public classes _(experimental)_:
* `case class Histogram(height: Double, buckets: Array[HistogramBucket]) `
* `case class HistogramBucket(lo: Double, hi: Double, ndv: Long)`
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