add ordering

src/datatypes/field.rs

@@ -3,7 +3,7 @@ use crate::error::{ArrowError, Result};
 use super::{DataType, Metadata};
 
 /// Represents the metadata of a "column".
-#[derive(Debug, Clone, Eq, PartialEq, Hash)]
+#[derive(Debug, Clone, Eq, PartialEq, Hash, PartialOrd, Ord)]
 pub struct Field {
     /// Its name
     pub name: String,

src/datatypes/mod.rs

@@ -24,7 +24,7 @@ pub(crate) type Extension = Option<(String, Option<String>)>;
 /// which declares the in-memory representation of data.
 /// The [`DataType::Extension`] is special in that it augments a [`DataType`] with metadata to support custom types.
 /// Use `to_logical_type` to desugar such type and return its correspoding logical type.
-#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+#[derive(Debug, Clone, PartialEq, Eq, Hash, PartialOrd, Ord)]
 pub enum DataType {
     /// Null type
     Null,
@@ -151,7 +151,7 @@ pub enum DataType {
 }
 
 /// Mode of [`DataType::Union`]
-#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, PartialOrd, Ord)]
 pub enum UnionMode {
     /// Dense union
     Dense,
@@ -182,7 +182,7 @@ impl UnionMode {
 }
 
 /// The time units defined in Arrow.
-#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, PartialOrd, Ord)]
 pub enum TimeUnit {
     /// Time in seconds.
     Second,
@@ -195,7 +195,7 @@ pub enum TimeUnit {
 }
 
 /// Interval units defined in Arrow
-#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, PartialOrd, Ord)]
 pub enum IntervalUnit {
     /// The number of elapsed whole months.
     YearMonth,

src/datatypes/physical_type.rs

@@ -50,7 +50,7 @@ impl PhysicalType {
 
 /// the set of valid indices types of a dictionary-encoded Array.
 /// Each type corresponds to a variant of [`crate::array::DictionaryArray`].
-#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, PartialOrd, Ord)]
 pub enum IntegerType {
     /// A signed 8-bit integer.
     Int8,