Github user SparkQA commented on the issue:
https://github.com/apache/spark/pull/22008
**[Test build #94293 has
finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/94293/testReport)**
for PR 22008 at commit
[`1caf256`](https://github.com/apache/spark/commit/1caf2567694c56cca019e6608609b81ac70deefa).
* This patch **fails Spark unit tests**.
* This patch merges cleanly.
* This patch adds the following public classes _(experimental)_:
* `trait JoinHelper extends PredicateHelper `
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