notfilippo commented on code in PR #12853:
URL: https://github.com/apache/datafusion/pull/12853#discussion_r1795614543
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datafusion/common/src/types/logical.rs:
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@@ -0,0 +1,41 @@
+use core::fmt;
+use std::{cmp::Ordering, hash::Hash, sync::Arc};
+
+use super::NativeType;
+
+/// A reference counted [`LogicalType`]
+pub type LogicalTypeRef = Arc<dyn LogicalType>;
+
+pub trait LogicalType: fmt::Debug {
Review Comment:
TODO: Documentation missing.
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