mustafasrepo commented on issue #11366:
URL: https://github.com/apache/datafusion/issues/11366#issuecomment-2219642347
Actually existing `AggregateExec` supports streaming. It has a member
`input_order_mode` which is following enum:
```rust
pub enum InputOrderMode {
/// There is no partial permutation of the expressions satisfying the
/// existing ordering.
Linear,
/// There is a partial permutation of the expressions satisfying the
/// existing ordering. Indices describing the longest partial permutation
/// are stored in the vector.
PartiallySorted(Vec<usize>),
/// There is a (full) permutation of the expressions satisfying the
/// existing ordering.
Sorted,
}
```
When mode is either `Sorted` or `PartiallySorted` (decided by planner
according to ordering at the input) operation is streamable. However, to
trigger this modes at least one of the group by expression should be ordered.
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