Github user viirya commented on the pull request:
https://github.com/apache/spark/pull/11722#issuecomment-199576685
For Join operator, it is indeed complicated as you see. Due to different
join type, the output nullability is inferred in different way. However, the
output of Join operator is also inferred according to its join type.
Btw, I think only Filter and Join will change output nullability with their
condition. Any other operator do that?
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