alamb commented on code in PR #3347:
URL: https://github.com/apache/arrow-datafusion/pull/3347#discussion_r967639082
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datafusion/common/src/lib.rs:
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@@ -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]
+macro_rules! downcast_value {
Review Comment:
It would be great to add some doc comments here (especially as this will now
become part of the public API). It could be done as a follow on PR too
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