Github user SparkQA commented on the issue:
https://github.com/apache/spark/pull/15443
**[Test build #66782 has
finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/66782/consoleFull)**
for PR 15443 at commit
[`a843920`](https://github.com/apache/spark/commit/a843920983914de7efd21608b8f0e39c70b210d7).
* This patch passes all tests.
* This patch merges cleanly.
* This patch adds the following public classes _(experimental)_:
* `case class StringHistogram(`
* ` case class StringHistogramInfo(`
* ` class StringHistogramInfoSerializer `
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