Github user Tagar commented on the issue:
https://github.com/apache/spark/pull/19683
There was a similar exception as in failing unit tests was fixed in
[SPARK-18300](https://issues.apache.org/jira/browse/SPARK-18300)
> java.lang.ClassCastException:
org.apache.spark.sql.catalyst.expressions.Literal cannot be cast to
org.apache.spark.sql.catalyst.expressions.Attribute
https://github.com/apache/spark/pull/15892
Not sure if this is directly applicable or helpful here though.
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