nevi-me commented on a change in pull request #317:
URL: https://github.com/apache/arrow-rs/pull/317#discussion_r634832945
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File path: arrow/src/compute/kernels/arithmetic.rs
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@@ -189,6 +189,74 @@ where
Ok(PrimitiveArray::<T>::from(data))
}
+/// Helper function to modulus two arrays.
+///
+/// # Errors
+///
+/// This function errors if:
+/// * the arrays have different lengths
+/// * a division by zero is found
+fn math_modulus<T>(
+ left: &PrimitiveArray<T>,
+ right: &PrimitiveArray<T>,
+) -> Result<PrimitiveArray<T>>
+where
+ T: ArrowNumericType,
+ T::Native: Rem<Output = T::Native> + Zero,
+{
+ if left.len() != right.len() {
+ return Err(ArrowError::ComputeError(
+ "Cannot perform math operation on arrays of different
length".to_string(),
+ ));
+ }
+
+ let null_bit_buffer =
+ combine_option_bitmap(left.data_ref(), right.data_ref(), left.len())?;
+
+ let buffer = if let Some(b) = &null_bit_buffer {
Review comment:
It might be better to check if the null count > 0, as there could be a
buffer even though all values are non-null
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