alamb commented on PR #3868:
URL:
https://github.com/apache/arrow-datafusion/pull/3868#issuecomment-1284578987
> @alamb would you mind giving an example? Expression boundaries for a
boolean field (like a, or true) would be ExpressionBoundaries { min: true, max:
true, distinct: 1}. And for a filter that does a < 5, we would (or should,
unless I am missing a scenario) not return a result (since they are from
different datatypes, this analysis is strictly for examples where both
datatypes are the same).
I guess I was thinking for an expression like
`a < 5`
If a has boundaries like
```
ExprBoundaries {min: 0, max:10}
```
I would expect the output boundaries for `a < 5` to be
```
ExprBoundaries {min: true, max:true}
```
(which by the way devolves into something that could be used for range based
pruning!)
But the code in this PR seems like it would return
```
ExprBoundaries {min: 0, max:4}
```
Or something
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