stuhood commented on issue #21207:
URL: https://github.com/apache/datafusion/issues/21207#issuecomment-4284235894
> At optimizer time, detect whether each side of the join has a
`RepartitionExec` between the scan and
> the join.
I might be missing something fundamental, but I'm not seeing why it is
necessary to differentiate a `RepartitionExec` from any other plan node.
`Partitioning` doesn't implement `Eq` (and probably shouldn't, although
potentially it could implement `PartialEq`), but shouldn't it always be
sufficient to do something like:
```rust
match (left, right) {
(Hash(expr1, size1), Hash(expr2, size2)) if expr1 == expr2 && size1 ==
size2 => /* partitions map 1:1 */,
...
}
```
...to check equivalence of partitioning in `HashJoin`, and then it wouldn't
matter what the source of that partitioning is?
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