Github user clockfly commented on the issue:
https://github.com/apache/spark/pull/14850
@cloud-fan
There are two branches to execute an UDF.
1. Call `override def eval(input: InternalRow): Any` directly. For this
code branch, I don't think there is any barrier for an user to know it is an
UDF problem, as the ScalaUDF is in the stack trace.
2. Another branch is in codegen. This code branch is confusing, in my
opinion. Since every different code piece from different expression is fused
into one code block. When an exception is thrown, we don't know who owns that
code block.
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