Enable clone_on_ref_ptr clippy lint on common

datafusion/common-runtime/src/lib.rs

@@ -14,6 +14,8 @@
 // KIND, either express or implied.  See the License for the
 // specific language governing permissions and limitations
 // under the License.
+// Make cheap clones clear: https://github.com/apache/datafusion/issues/11143
+#![deny(clippy::clone_on_ref_ptr)]
 
 pub mod common;
 

datafusion/common/src/dfschema.rs

@@ -211,7 +211,7 @@ impl DFSchema {
         schema: &SchemaRef,
     ) -> Result<Self> {
         let dfschema = Self {
-            inner: schema.clone(),
+            inner: Arc::clone(schema),
             field_qualifiers: qualifiers,
             functional_dependencies: FunctionalDependencies::empty(),
         };
@@ -311,7 +311,7 @@ impl DFSchema {
             };
             if !duplicated_field {
                 // self.inner.fields.push(field.clone());
-                schema_builder.push(field.clone());
+                schema_builder.push(Arc::clone(field));
                 qualifiers.push(qualifier.cloned());
             }
         }
@@ -1276,23 +1276,23 @@ mod tests {
         let arrow_schema_ref = Arc::new(arrow_schema.clone());
 
         let df_schema = DFSchema {
-            inner: arrow_schema_ref.clone(),
+            inner: Arc::clone(&arrow_schema_ref),
             field_qualifiers: vec![None; arrow_schema_ref.fields.len()],
             functional_dependencies: FunctionalDependencies::empty(),
         };
         let df_schema_ref = Arc::new(df_schema.clone());
 
         {
             let arrow_schema = arrow_schema.clone();
-            let arrow_schema_ref = arrow_schema_ref.clone();
+            let arrow_schema_ref = Arc::clone(&arrow_schema_ref);
 
             assert_eq!(df_schema, arrow_schema.to_dfschema().unwrap());
             assert_eq!(df_schema, arrow_schema_ref.to_dfschema().unwrap());
         }
 
         {
             let arrow_schema = arrow_schema.clone();
-            let arrow_schema_ref = arrow_schema_ref.clone();
+            let arrow_schema_ref = Arc::clone(&arrow_schema_ref);
 
             assert_eq!(df_schema_ref, arrow_schema.to_dfschema_ref().unwrap());
             assert_eq!(df_schema_ref, arrow_schema_ref.to_dfschema_ref().unwrap());
@@ -1322,7 +1322,7 @@ mod tests {
         let schema = Arc::new(Schema::new(vec![a_field, b_field]));
 
         let df_schema = DFSchema {
-            inner: schema.clone(),
+            inner: Arc::clone(&schema),
             field_qualifiers: vec![None; schema.fields.len()],
             functional_dependencies: FunctionalDependencies::empty(),
         };

datafusion/common/src/hash_utils.rs

@@ -244,7 +244,7 @@ fn hash_list_array<OffsetSize>(
 where
     OffsetSize: OffsetSizeTrait,
 {
-    let values = array.values().clone();
+    let values = Arc::clone(array.values());
     let offsets = array.value_offsets();
     let nulls = array.nulls();
     let mut values_hashes = vec![0u64; values.len()];
@@ -274,7 +274,7 @@ fn hash_fixed_list_array(
     random_state: &RandomState,
     hashes_buffer: &mut [u64],
 ) -> Result<()> {
-    let values = array.values().clone();
+    let values = Arc::clone(array.values());
     let value_len = array.value_length();
     let offset_size = value_len as usize / array.len();
     let nulls = array.nulls();
@@ -622,19 +622,19 @@ mod tests {
             vec![
                 (
                     Arc::new(Field::new("bool", DataType::Boolean, false)),
-                    boolarr.clone() as ArrayRef,
+                    Arc::clone(&boolarr) as ArrayRef,
                 ),
                 (
                     Arc::new(Field::new("i32", DataType::Int32, false)),
-                    i32arr.clone() as ArrayRef,
+                    Arc::clone(&i32arr) as ArrayRef,
                 ),
                 (
                     Arc::new(Field::new("i32", DataType::Int32, false)),
-                    i32arr.clone() as ArrayRef,
+                    Arc::clone(&i32arr) as ArrayRef,
                 ),
                 (
                     Arc::new(Field::new("bool", DataType::Boolean, false)),
-                    boolarr.clone() as ArrayRef,
+                    Arc::clone(&boolarr) as ArrayRef,
                 ),
             ],
             Buffer::from(&[0b001011]),
@@ -710,7 +710,12 @@ mod tests {
         let random_state = RandomState::with_seeds(0, 0, 0, 0);
 
         let mut one_col_hashes = vec![0; strings1.len()];
-        create_hashes(&[dict_array.clone()], &random_state, &mut one_col_hashes).unwrap();
+        create_hashes(
+            &[Arc::clone(&dict_array) as ArrayRef],
+            &random_state,
+            &mut one_col_hashes,
+        )
+        .unwrap();
 
         let mut two_col_hashes = vec![0; strings1.len()];
         create_hashes(

datafusion/common/src/lib.rs

@@ -14,6 +14,8 @@
 // KIND, either express or implied.  See the License for the
 // specific language governing permissions and limitations
 // under the License.
+// Make cheap clones clear: https://github.com/apache/datafusion/issues/11143
+#![deny(clippy::clone_on_ref_ptr)]
 
 mod column;
 mod dfschema;