Github user viirya commented on the pull request:
https://github.com/apache/spark/pull/4940#issuecomment-81130668
I think it is because the codes you refer to access the element directly
with array index. If the ordinsl is not valid, runtime exception will be
thrown. But for the generated codes, it uses many `if` condition to determine
the element to access. So if the ordinal is not valide, it needs to throw an
exception. That is why it originally calls `accessorFailure` after all cases
are not met.
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