alamb commented on a change in pull request #1408:
URL: https://github.com/apache/arrow-datafusion/pull/1408#discussion_r769985627
##########
File path: datafusion/src/physical_plan/expressions/average.rs
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@@ -38,11 +38,18 @@ use super::{format_state_name, sum};
pub struct Avg {
name: String,
expr: Arc<dyn PhysicalExpr>,
+ data_type: DataType,
}
/// function return type of an average
pub fn avg_return_type(arg_type: &DataType) -> Result<DataType> {
match arg_type {
+ DataType::Decimal(precision, scale) => {
+ // the new precision and scale for return type of avg function
Review comment:
I think following the spark behavior is reasonable, but it should be
documented (aka that the constant `4` came from spark).
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