Github user HyukjinKwon commented on the issue:
https://github.com/apache/spark/pull/13599
@holdenk and @zjffdu, I believe manual tests are a-okay if it's difficult
to write a test. We can manually test and expose this as an experimental
feature too.
BTW, I believe we can still have some tests to check if, for example, at
least the string is properly constructed -
https://github.com/apache/spark/pull/13599/files#r175670974? I think that could
be enough for now. Somehow I happened to look into this multiple times over few
years and I think it's better to go ahead than just blocking here.
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