Github user SparkQA commented on the issue:
https://github.com/apache/spark/pull/17848
**[Test build #76915 has
finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/76915/testReport)**
for PR 17848 at commit
[`00b4dff`](https://github.com/apache/spark/commit/00b4dff4e4b57f1406d99957655e2cb3bd85ad8e).
* This patch **fails PySpark unit tests**.
* This patch merges cleanly.
* This patch adds the following public classes _(experimental)_:
* ` throw new IOException(s\"UDF class $className doesn't
implement any UDF interface\")`
* ` throw new IOException(s\"It is invalid to implement multiple
UDF interfaces, UDF class $className\")`
* ` case n => logError(s\"UDF class with $n type arguments is
not supported \")`
* ` logError(s\"Can not instantiate class $className, please
make sure it has public non argument constructor\")`
* ` case e: ClassNotFoundException => logError(s\"Can not load class
$className, please make sure it is on the classpath\")`
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