AngersZhuuuu commented on pull request #33183:
URL: https://github.com/apache/spark/pull/33183#issuecomment-874429011
> > Our prod have a very complex job and spark version is 3.1.2. I have
tried to put it in UT but it run as normal. But this error actually happen in
our prod. With this patch our job can run well.
>
> What you mean "you put it in UT but it runs as normal"? Do you mean you
put the failed case into UT and it works well?
Yea, it work like `sql("select employer.company, employer.company.name,
employer.company.address from contacts")` as expect.
But in prod it failed because this bug. Didn't find the reason why cause
parse `employer.company`, `employer.company.name`'s `employer.company` yet.
But any way, since we handle duplicated filed use `semanticEqual`, use
`semanticEquals` here is more rigorous
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