Github user SparkQA commented on the issue:
https://github.com/apache/spark/pull/20499
**[Test build #87198 has
finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/87198/testReport)**
for PR 20499 at commit
[`a349d07`](https://github.com/apache/spark/commit/a349d078a78efe0763b90b932c8d0b26f6aa4c86).
* This patch passes all tests.
* This patch merges cleanly.
* This patch adds the following public classes _(experimental)_:
* `class _NoValueType(object):`
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