findepi commented on code in PR #14683:
URL: https://github.com/apache/datafusion/pull/14683#discussion_r1957408465
##########
datafusion/common/src/lib.rs:
##########
@@ -104,21 +104,72 @@ pub type HashSet<T, S = DefaultHashBuilder> =
hashbrown::HashSet<T, S>;
#[macro_export]
macro_rules! downcast_value {
($Value: expr, $Type: ident) => {{
- use std::any::type_name;
- $Value.as_any().downcast_ref::<$Type>().ok_or_else(|| {
- DataFusionError::Internal(format!(
- "could not cast value to {}",
- type_name::<$Type>()
- ))
- })?
+ use $crate::__private::DowncastArrayHelper;
+ $Value.downcast_array_helper::<$Type>()?
}};
($Value: expr, $Type: ident, $T: tt) => {{
- use std::any::type_name;
- $Value.as_any().downcast_ref::<$Type<$T>>().ok_or_else(|| {
- DataFusionError::Internal(format!(
- "could not cast value to {}",
- type_name::<$Type<$T>>()
- ))
- })?
+ use $crate::__private::DowncastArrayHelper;
+ $Value.downcast_array_helper::<$Type<$T>>()?
}};
}
+
+// Not public API.
+#[doc(hidden)]
+pub mod __private {
+ use super::DataFusionError;
+ use super::Result;
+ use arrow::array::Array;
+ use std::any::{type_name, Any};
+
+ #[doc(hidden)]
+ pub trait DowncastArrayHelper {
+ fn downcast_array_helper<U: Any>(&self) -> Result<&U>;
+ }
+
+ impl<T: Array + ?Sized> DowncastArrayHelper for T {
+ fn downcast_array_helper<U: Any>(&self) -> Result<&U> {
+ self.as_any().downcast_ref().ok_or_else(|| {
+ DataFusionError::Internal(format!(
Review Comment:
pre-existing, but will do too
good catch
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