alamb commented on issue #563:
URL: https://github.com/apache/arrow-rs/issues/563#issuecomment-890497670
While looking through the hash join code from @Dandandan in DataFusion, I
found another implementation of a comparator that is similar to the comparator
interface proposed in this PR. It is called `equal_rows` and could potentially
benefit from not dispatching on the type (to then have to downcast as well) on
each comparison
```rust
/// Left and right row have equal values
fn equal_rows(
left: usize,
right: usize,
left_arrays: &[ArrayRef],
right_arrays: &[ArrayRef],
) -> Result<bool> {
```
https://github.com/apache/arrow-datafusion/blob/18c581c4dbfbc3b5d135b3bc0d1cdb5c16af9c78/datafusion/src/physical_plan/hash_join.rs#L813
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