Github user wzhfy commented on the issue:
https://github.com/apache/spark/pull/17446
> Ideally, our optimizer rule BooleanSimplification should be able to
remove the null literal, like what we did for true and false literals. Here, I
think we should just assume our filter estimation does not depend on any other
optimizer rules.
Sorry I may miss some context, but I prefer enhancing
`BooleanSimplification` to deal with null literals. There's no need to
complicate estimation logic for those deterministic literals which can be
removed by optimizer.
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