comphead commented on code in PR #10149:
URL: https://github.com/apache/datafusion/pull/10149#discussion_r1578081165
##########
datafusion/physical-expr/src/aggregate/array_agg.rs:
##########
@@ -187,17 +333,261 @@ impl Accumulator for ArrayAggAccumulator {
}
}
+struct ArrayAggGroupsAccumulator<T>
+where
+ T: ArrowPrimitiveType + Send,
+{
+ values: Vec<PrimitiveBuilder<T>>,
+ data_type: DataType,
+ null_state: NullState,
+}
+
+impl<T> ArrayAggGroupsAccumulator<T>
+where
+ T: ArrowPrimitiveType + Send,
+{
+ pub fn new(data_type: &DataType) -> Self {
+ Self {
+ values: vec![],
+ data_type: data_type.clone(),
+ null_state: NullState::new(),
+ }
+ }
+}
+
+impl<T: ArrowPrimitiveType + Send> ArrayAggGroupsAccumulator<T> {
+ fn build_list(&mut self, emit_to: EmitTo) -> Result<ArrayRef> {
+ let arrays = emit_to.take_needed(&mut self.values);
+ let nulls = self.null_state.build(emit_to);
+
+ let len = nulls.len();
+ assert_eq!(arrays.len(), len);
+
+ let mut builder = ListBuilder::with_capacity(
+
PrimitiveBuilder::<T>::new().with_data_type(self.data_type.clone()),
+ len,
+ );
+
+ for (is_valid, mut arr) in nulls.iter().zip(arrays.into_iter()) {
+ if is_valid {
+ builder.append_value(arr.finish().into_iter());
+ } else {
+ builder.append_null();
+ }
+ }
+
+ Ok(Arc::new(builder.finish()))
+ }
+}
+
+impl<T> GroupsAccumulator for ArrayAggGroupsAccumulator<T>
+where
+ T: ArrowPrimitiveType + Send + Sync,
+{
+ fn update_batch(
+ &mut self,
+ new_values: &[ArrayRef],
+ group_indices: &[usize],
+ opt_filter: Option<&BooleanArray>,
+ total_num_groups: usize,
+ ) -> Result<()> {
+ assert_eq!(new_values.len(), 1, "single argument to update_batch");
Review Comment:
Please return an internal_err!("") with more user friendly message
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