Rachelint commented on issue #11931:
URL: https://github.com/apache/datafusion/issues/11931#issuecomment-2283176521
The new procedure sketch:
- New emission mode:
```
pub enum EmitTo {
/// Emit all groups
All,
/// Emit only the first `n` groups and shift all existing group
/// indexes down by `n`.
///
/// For example, if `n=10`, group_index `0, 1, ... 9` are emitted
/// and group indexes '`10, 11, 12, ...` become `0, 1, 2, ...`.
First(usize),
/// Emit all groups managed by blocks
AllBlocks,
/// Try to emit only the first `n` groups similar as `First`.
/// But `n` will be aligned to block size, and finally serval blocks
will be returned.
///
/// For example, `n= 10`, `block size=4`, `n` will be aligned to 12,
/// and finally 3 blocks will be returned.
FirstBlocks(usize),
}
```
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