Github user dongjoon-hyun commented on the issue:
https://github.com/apache/spark/pull/14235
First, we will make more HINTS. I made a general HINT syntax for that. We
are opening the door together.
Second, when you add your new testcase here, the additional cost is just
**one second** to generate the file.
Third, when you develops your PR, this will save much time. I'm already
using this to save my time. At this time, we need to verify correctness at
every level. If you use optimized result or the execution result, that is a
naive test. You know that.
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