pan3793 commented on PR #37483:
URL: https://github.com/apache/spark/pull/37483#issuecomment-1559306005
@cloud-fan, sorry my previous comment is not correct.
After SPARK-37820, `select unbase64("abcs==")`(malformed input) always
throws an exception, this PR does not help in that case, it only improves the
error message for `to_binary()`.
So, `unbase64()`'s behavior for malformed input changes silently after
SPARK-37820:
- before: return a malformed decode value (maybe a best-effort parsed
result, not sure)
- after: throw an exception
And there is no way to restore the previous behavior. To tolerate the
malformed input, the user should migrate "unbase64(<input>)" to
`try_to_binary(<input>, 'base64')` to get NULL instead of interrupting by
exception.
This is kind of an awkward situation.
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