alamb commented on code in PR #15776:
URL: https://github.com/apache/datafusion/pull/15776#discussion_r2160311996
##########
datafusion/functions-aggregate/src/correlation.rs:
##########
@@ -372,10 +377,8 @@ impl GroupsAccumulator for CorrelationGroupsAccumulator {
self.sum_xx.resize(total_num_groups, 0.0);
self.sum_yy.resize(total_num_groups, 0.0);
- let array_x = &cast(&values[0], &DataType::Float64)?;
- let array_x = downcast_array::<Float64Array>(array_x);
- let array_y = &cast(&values[1], &DataType::Float64)?;
- let array_y = downcast_array::<Float64Array>(array_y);
+ let array_x = downcast_array::<Float64Array>(&values[0]);
Review Comment:
It looks to me like this code only handles `Float64` but the signature of
the function reports that it accepts any numeric type:
```rust
impl Correlation {
/// Create a new COVAR_POP aggregate function
pub fn new() -> Self {
Self {
signature: Signature::uniform(2, NUMERICS.to_vec(),
Volatility::Immutable),
}
}
}
```
I wonder if you just changed the signature to say the function needs Float64
argument types, woudl that be enough?
DataFusion already has a bunch of coercion rules, see
https://docs.rs/datafusion/latest/datafusion/logical_expr/type_coercion/index.html
for example
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