Github user gberger commented on the issue:
https://github.com/apache/spark/pull/19792
Maybe a more performant way to do the path in the error message would be to
propagate it *up* the stack via try/catching the errors and adding the paths as
it goes.
But this way seems really weird to me...
```
elif isinstance(a, ArrayType):
try:
return ArrayType(_merge_type(a.elementType, b.elementType),
True)
catch TypeError as e:
raise TypeError("arrayElement." + str(e))
```
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