Github user SparkQA commented on the issue:
https://github.com/apache/spark/pull/21747
**[Test build #92859 has
finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/92859/testReport)**
for PR 21747 at commit
[`a2fe63e`](https://github.com/apache/spark/commit/a2fe63e1d48b0291feaa9fcd008654da051d1f1b).
* This patch **fails Spark unit tests**.
* This patch merges cleanly.
* This patch adds the following public classes _(experimental)_:
* `trait ComplexTypeMergingExpression extends Expression `
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