andygrove commented on code in PR #3347:
URL: https://github.com/apache/arrow-datafusion/pull/3347#discussion_r967661085
##########
datafusion/common/src/lib.rs:
##########
@@ -27,3 +27,23 @@ pub use column::Column;
pub use dfschema::{DFField, DFSchema, DFSchemaRef, ExprSchema, ToDFSchema};
pub use error::{field_not_found, DataFusionError, Result, SchemaError};
pub use scalar::{ScalarType, ScalarValue};
+
+#[macro_export]
Review Comment:
```suggestion
/// Downcast an Arrow Array to a concrete type, return an `Err` if the cast
is
/// not possible.
///
/// Example: `let array = downcast_value!(values, Int32Array)`
#[macro_export]
```
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