@@ -148,9 +148,9 @@ impl BlockedEmitTo {
 /// [`Self::block_size`] groups, and emitting returns one array per block
 /// instead of one large array.
 ///
-/// Hash aggregation uses a `BlockedGroupsAccumulator` only when every
-/// aggregate in the query (and the group keys) support blocked storage;
-/// otherwise the whole aggregation uses [`GroupsAccumulator`].
+/// Hash aggregation uses a `BlockedGroupsAccumulator` for every aggregate
+/// that has one, and a [`GroupsAccumulator`] for the others, in the same
+/// aggregation.
 ///
 /// [`GroupsAccumulator`]: crate::groups_accumulator::GroupsAccumulator
 pub trait BlockedGroupsAccumulator: Send + Any {
 
@@ -685,10 +685,9 @@ pub trait AggregateUDFImpl: Debug + DynEq + DynHash + Send + Sync + Any {
         not_impl_err!("GroupsAccumulator hasn't been implemented for {self:?} yet")
     }
 
-    /// If this aggregate has a [`BlockedGroupsAccumulator`]. When every
-    /// aggregate in a hash aggregation returns `true` (and the group key is
-    /// supported), group state is stored in blocks and released block by
-    /// block. Defaults to `false`.
+    /// If this aggregate has a [`BlockedGroupsAccumulator`]. When `true`,
+    /// hash aggregation stores this aggregate's group state in blocks and
+    /// releases it block by block. Defaults to `false`.
     fn blocked_groups_accumulator_supported(&self, _args: AccumulatorArgs) -> bool {
         false
     }
Original file line number	Diff line number	Diff line change
`@@ -685,10 +685,9 @@ pub trait AggregateUDFImpl: Debug + DynEq + DynHash + Send + Sync + Any {`
`685`	`685`	`not_impl_err!("GroupsAccumulator hasn't been implemented for {self:?} yet")`
`686`	`686`	`}`
`687`	`687`
`688`		- /// If this aggregate has a [`BlockedGroupsAccumulator`]. When every
`689`		- /// aggregate in a hash aggregation returns `true` (and the group key is
`690`		`- /// supported), group state is stored in blocks and released block by`
`691`		- /// block. Defaults to `false`.
	`688`	+ /// If this aggregate has a [`BlockedGroupsAccumulator`]. When `true`,
	`689`	`+ /// hash aggregation stores this aggregate's group state in blocks and`
	`690`	+ /// releases it block by block. Defaults to `false`.
`692`	`691`	`fn blocked_groups_accumulator_supported(&self, _args: AccumulatorArgs) -> bool {`
`693`	`692`	`false`
`694`	`693`	`}`