alamb commented on PR #15503:
URL: https://github.com/apache/datafusion/pull/15503#issuecomment-2787539880
I think the current API in this PR (returning `PartitionedStatistics`) is
nice from the point of view that it provides the finest granularity access to
statistics (provides per partition information that can be summarized when
desired).
I do agree it is unfortunate that `ExecutionPlan::statistics` and
`ExecutionPlan::partitioned_statistics` may end up being redundant.
However, I think changing the signature of `ExecutionPlan::statistics` will
just be that much more disruptive.
So what I personally suggest is add `ExecutionPlan::partitioned_statistics`
as in this PR, but work to reduce the duplication. I think we could add a
default implementation of `statistics` that just called through to
`partitioned-statistics` which would avoid the duplication. Something like
```rust
pub trait ExecutionPlan {
...
fn statistics(&self) -> Result<Statistics> {
self.partitioned_statistics().combine()
}
...
````
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