alamb commented on a change in pull request #1681:
URL: https://github.com/apache/arrow-datafusion/pull/1681#discussion_r792940671
##########
File path: datafusion/src/physical_plan/expressions/array_agg.rs
##########
@@ -95,77 +95,60 @@ impl AggregateExpr for ArrayAgg {
#[derive(Debug)]
pub(crate) struct ArrayAggAccumulator {
- array: Vec<ScalarValue>,
+ values: Vec<ScalarValue>,
datatype: DataType,
}
impl ArrayAggAccumulator {
/// new array_agg accumulator based on given item data type
pub fn try_new(datatype: &DataType) -> Result<Self> {
Ok(Self {
- array: vec![],
+ values: vec![],
datatype: datatype.clone(),
})
}
-
- fn update(&mut self, values: &[ScalarValue]) -> Result<()> {
- let value = &values[0];
- self.array.push(value.clone());
-
- Ok(())
- }
-
- fn merge(&mut self, states: &[ScalarValue]) -> Result<()> {
- if states.is_empty() {
- return Ok(());
- };
-
- assert!(states.len() == 1, "states length should be 1!");
- match &states[0] {
- ScalarValue::List(Some(array), _) => {
- self.array.extend((&**array).clone());
- }
- _ => unreachable!(),
- }
- Ok(())
- }
}
impl Accumulator for ArrayAggAccumulator {
fn update_batch(&mut self, values: &[ArrayRef]) -> Result<()> {
if values.is_empty() {
return Ok(());
};
- (0..values[0].len()).try_for_each(|index| {
- let v = values
- .iter()
- .map(|array| ScalarValue::try_from_array(array, index))
- .collect::<Result<Vec<_>>>()?;
- self.update(&v)
+ assert!(values.len() == 1, "array_agg can only take 1 param!");
Review comment:
I like the new assert 👍
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