Rachelint commented on code in PR #11943:
URL: https://github.com/apache/datafusion/pull/11943#discussion_r1728367892
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datafusion/expr-common/src/groups_accumulator.rs:
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@@ -143,6 +145,25 @@ pub trait GroupsAccumulator: Send {
/// [`Accumulator::state`]: crate::accumulator::Accumulator::state
fn state(&mut self, emit_to: EmitTo) -> Result<Vec<ArrayRef>>;
+ /// Returns `true` if this accumulator supports blocked mode.
+ fn supports_blocked_mode(&self) -> bool {
+ false
+ }
+
+ /// Switch the accumulator to flat or blocked mode.
+ /// You can see detail about the mode on [GroupStatesMode].
+ ///
+ /// After switching mode, all data in previous mode will be cleared.
+ fn switch_to_mode(&mut self, mode: GroupStatesMode) -> Result<()> {
Review Comment:
:thinking: But as I think, the similar function may be needed now as I
memtioned above avout `The need of switching from hash aggr to streaming aggr`
problem.
Maybe we can support a similar function such as `alter_block_size`?
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