andygrove commented on a change in pull request #7967:
URL: https://github.com/apache/arrow/pull/7967#discussion_r471146144
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File path: rust/datafusion/src/execution/physical_plan/math_expressions.rs
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@@ -20,36 +20,62 @@
use crate::error::ExecutionError;
use crate::execution::physical_plan::udf::ScalarFunction;
-use arrow::array::{Array, ArrayRef, Float64Array, Float64Builder};
-use arrow::datatypes::{DataType, Field};
+use arrow::array::{Array, ArrayRef};
+use arrow::array::{Float32Array, Float64Array};
+use arrow::datatypes::DataType;
use std::sync::Arc;
+macro_rules! compute_op {
+ ($ARRAY:expr, $FUNC:ident, $TYPE:ident) => {{
+ let mut builder = <$TYPE>::builder($ARRAY.len());
+ for i in 0..$ARRAY.len() {
+ if $ARRAY.is_null(i) {
+ builder.append_null()?;
+ } else {
+ builder.append_value($ARRAY.value(i).$FUNC())?;
+ }
+ }
+ Ok(Arc::new(builder.finish()))
+ }};
+}
+
+macro_rules! downcast_compute_op {
+ ($ARRAY:expr, $NAME:expr, $FUNC:ident, $TYPE:ident) => {{
+ let n = $ARRAY.as_any().downcast_ref::<$TYPE>();
+ match n {
+ Some(array) => compute_op!(array, $FUNC, $TYPE),
+ _ => Err(ExecutionError::General(format!(
+ "Invalid data type for {}",
+ $NAME
+ ))),
+ }
+ }};
+}
+
+macro_rules! unary_primitive_array_op {
+ ($ARRAY:expr, $NAME:expr, $FUNC:ident) => {{
+ match ($ARRAY).data_type() {
+ DataType::Float32 => downcast_compute_op!($ARRAY, $NAME, $FUNC,
Float32Array),
+ DataType::Float64 => downcast_compute_op!($ARRAY, $NAME, $FUNC,
Float64Array),
+ other => Err(ExecutionError::General(format!(
+ "Unsupported data type {:?} for function {}",
+ other, $NAME,
+ ))),
+ }
+ }};
+}
+
macro_rules! math_unary_function {
($NAME:expr, $FUNC:ident) => {
ScalarFunction::new(
$NAME,
- vec![Field::new("n", DataType::Float64, true)],
+ // order: from faster to slower
+ vec![vec![DataType::Float32], vec![DataType::Float64]],
DataType::Float64,
Review comment:
Should there be a relationship between argument type and return type?
should `sqrt(f32)` return `f32`, and `sqrt(f64)` return `f64` for example?
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