diff --git a/datafusion/substrait/src/extensions.rs b/datafusion/substrait/src/extensions.rs
index 0fd29dc1eaaa..54f51deac953 100644
--- a/datafusion/substrait/src/extensions.rs
+++ b/datafusion/substrait/src/extensions.rs
@@ -22,6 +22,7 @@ use substrait::proto::extensions::simple_extension_declaration::{
 };
 use substrait::proto::extensions::SimpleExtensionDeclaration;
 
+#[derive(Default)]
 pub struct Extensions {
     pub functions: HashMap<u32, String>,
     pub types: HashMap<u32, String>,
@@ -29,14 +30,6 @@ pub struct Extensions {
 }
 
 impl Extensions {
-    pub fn new() -> Self {
-        Self {
-            functions: HashMap::new(),
-            types: HashMap::new(),
-            type_variations: HashMap::new(),
-        }
-    }
-
     pub fn register_function(&mut self, function_name: String) -> u32 {
         let function_name = function_name.to_lowercase();
 
@@ -107,10 +100,10 @@ impl TryFrom<&Vec<SimpleExtensionDeclaration>> for Extensions {
     }
 }
 
-impl Into<Vec<SimpleExtensionDeclaration>> for Extensions {
-    fn into(self) -> Vec<SimpleExtensionDeclaration> {
+impl From<Extensions> for Vec<SimpleExtensionDeclaration> {
+    fn from(val: Extensions) -> Vec<SimpleExtensionDeclaration> {
         let mut extensions = vec![];
-        for (f_anchor, f_name) in self.functions {
+        for (f_anchor, f_name) in val.functions {
             let function_extension = ExtensionFunction {
                 extension_uri_reference: u32::MAX,
                 function_anchor: f_anchor,
@@ -122,7 +115,7 @@ impl Into<Vec<SimpleExtensionDeclaration>> for Extensions {
             extensions.push(simple_extension);
         }
 
-        for (t_anchor, t_name) in self.types {
+        for (t_anchor, t_name) in val.types {
             let type_extension = ExtensionType {
                 extension_uri_reference: u32::MAX, // We don't register proper extension URIs yet
                 type_anchor: t_anchor,
@@ -134,7 +127,7 @@ impl Into<Vec<SimpleExtensionDeclaration>> for Extensions {
             extensions.push(simple_extension);
         }
 
-        for (tv_anchor, tv_name) in self.type_variations {
+        for (tv_anchor, tv_name) in val.type_variations {
             let type_variation_extension = ExtensionTypeVariation {
                 extension_uri_reference: u32::MAX, // We don't register proper extension URIs yet
                 type_variation_anchor: tv_anchor,
diff --git a/datafusion/substrait/src/logical_plan/consumer.rs b/datafusion/substrait/src/logical_plan/consumer.rs
index 1c0300bcacd7..c328fa6e918b 100644
--- a/datafusion/substrait/src/logical_plan/consumer.rs
+++ b/datafusion/substrait/src/logical_plan/consumer.rs
@@ -41,11 +41,15 @@ use crate::variation_const::{
     DATE_32_TYPE_VARIATION_REF, DATE_64_TYPE_VARIATION_REF,
     DECIMAL_128_TYPE_VARIATION_REF, DECIMAL_256_TYPE_VARIATION_REF,
     DEFAULT_CONTAINER_TYPE_VARIATION_REF, DEFAULT_TYPE_VARIATION_REF,
-    INTERVAL_DAY_TIME_TYPE_REF, INTERVAL_MONTH_DAY_NANO_TYPE_NAME,
-    INTERVAL_MONTH_DAY_NANO_TYPE_REF, INTERVAL_YEAR_MONTH_TYPE_REF,
-    LARGE_CONTAINER_TYPE_VARIATION_REF, TIMESTAMP_MICRO_TYPE_VARIATION_REF,
-    TIMESTAMP_MILLI_TYPE_VARIATION_REF, TIMESTAMP_NANO_TYPE_VARIATION_REF,
-    TIMESTAMP_SECOND_TYPE_VARIATION_REF, UNSIGNED_INTEGER_TYPE_VARIATION_REF,
+    INTERVAL_MONTH_DAY_NANO_TYPE_NAME, LARGE_CONTAINER_TYPE_VARIATION_REF,
+    TIMESTAMP_MICRO_TYPE_VARIATION_REF, TIMESTAMP_MILLI_TYPE_VARIATION_REF,
+    TIMESTAMP_NANO_TYPE_VARIATION_REF, TIMESTAMP_SECOND_TYPE_VARIATION_REF,
+    UNSIGNED_INTEGER_TYPE_VARIATION_REF,
+};
+#[allow(deprecated)]
+use crate::variation_const::{
+    INTERVAL_DAY_TIME_TYPE_REF, INTERVAL_MONTH_DAY_NANO_TYPE_REF,
+    INTERVAL_YEAR_MONTH_TYPE_REF,
 };
 use datafusion::common::scalar::ScalarStructBuilder;
 use datafusion::logical_expr::expr::InList;
@@ -1500,6 +1504,7 @@ fn from_substrait_type(
                     }
                 } else {
                     // Kept for backwards compatibility, new plans should include the extension instead
+                    #[allow(deprecated)]
                     match u.type_reference {
                         // Kept for backwards compatibility, use IntervalYear instead
                         INTERVAL_YEAR_MONTH_TYPE_REF => {
@@ -1848,6 +1853,7 @@ fn from_substrait_literal(
                 }
             } else {
                 // Kept for backwards compatibility - new plans should include extension instead
+                #[allow(deprecated)]
                 match user_defined.type_reference {
                     // Kept for backwards compatibility, use IntervalYearToMonth instead
                     INTERVAL_YEAR_MONTH_TYPE_REF => {
diff --git a/datafusion/substrait/src/logical_plan/producer.rs b/datafusion/substrait/src/logical_plan/producer.rs
index 20fb31872f29..abdec43517c2 100644
--- a/datafusion/substrait/src/logical_plan/producer.rs
+++ b/datafusion/substrait/src/logical_plan/producer.rs
@@ -97,7 +97,7 @@ use substrait::{
 
 /// Convert DataFusion LogicalPlan to Substrait Plan
 pub fn to_substrait_plan(plan: &LogicalPlan, ctx: &SessionContext) -> Result<Box<Plan>> {
-    let mut extensions = Extensions::new();
+    let mut extensions = Extensions::default();
     // Parse relation nodes
     // Generate PlanRel(s)
     // Note: Only 1 relation tree is currently supported