Enable clone_on_ref_ptr clippy lint on expr crate

datafusion/expr/src/expr_rewriter/mod.rs

@@ -214,7 +214,7 @@ pub fn coerce_plan_expr_for_schema(
         LogicalPlan::Projection(Projection { expr, input, .. }) => {
             let new_exprs =
                 coerce_exprs_for_schema(expr.clone(), input.schema(), schema)?;
-            let projection = Projection::try_new(new_exprs, input.clone())?;
+            let projection = Projection::try_new(new_exprs, Arc::clone(input))?;
             Ok(LogicalPlan::Projection(projection))
         }
         _ => {

datafusion/expr/src/expr_schema.rs

@@ -520,7 +520,7 @@ pub fn cast_subquery(subquery: Subquery, cast_to_type: &DataType) -> Result<Subq
                 .cast_to(cast_to_type, projection.input.schema())?;
             LogicalPlan::Projection(Projection::try_new(
                 vec![cast_expr],
-                projection.input.clone(),
+                Arc::clone(&projection.input),
             )?)
         }
         _ => {

datafusion/expr/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)]
 
 //! [DataFusion](https://github.com/apache/datafusion)
 //! is an extensible query execution framework that uses

datafusion/expr/src/logical_plan/builder.rs

@@ -1223,17 +1223,17 @@ pub fn build_join_schema(
         JoinType::Inner => {
             // left then right
             let left_fields = left_fields
-                .map(|(q, f)| (q.cloned(), f.clone()))
+                .map(|(q, f)| (q.cloned(), Arc::clone(f)))
                 .collect::<Vec<_>>();
             let right_fields = right_fields
-                .map(|(q, f)| (q.cloned(), f.clone()))
+                .map(|(q, f)| (q.cloned(), Arc::clone(f)))
                 .collect::<Vec<_>>();
             left_fields.into_iter().chain(right_fields).collect()
         }
         JoinType::Left => {
             // left then right, right set to nullable in case of not matched scenario
             let left_fields = left_fields
-                .map(|(q, f)| (q.cloned(), f.clone()))
+                .map(|(q, f)| (q.cloned(), Arc::clone(f)))
                 .collect::<Vec<_>>();
             left_fields
                 .into_iter()
@@ -1243,7 +1243,7 @@ pub fn build_join_schema(
         JoinType::Right => {
             // left then right, left set to nullable in case of not matched scenario
             let right_fields = right_fields
-                .map(|(q, f)| (q.cloned(), f.clone()))
+                .map(|(q, f)| (q.cloned(), Arc::clone(f)))
                 .collect::<Vec<_>>();
             nullify_fields(left_fields)
                 .into_iter()
@@ -1259,11 +1259,15 @@ pub fn build_join_schema(
         }
         JoinType::LeftSemi | JoinType::LeftAnti => {
             // Only use the left side for the schema
-            left_fields.map(|(q, f)| (q.cloned(), f.clone())).collect()
+            left_fields
+                .map(|(q, f)| (q.cloned(), Arc::clone(f)))
+                .collect()
         }
         JoinType::RightSemi | JoinType::RightAnti => {
             // Only use the right side for the schema
-            right_fields.map(|(q, f)| (q.cloned(), f.clone())).collect()
+            right_fields
+                .map(|(q, f)| (q.cloned(), Arc::clone(f)))
+                .collect()
         }
     };
     let func_dependencies = left.functional_dependencies().join(
@@ -1578,7 +1582,7 @@ impl TableSource for LogicalTableSource {
     }
 
     fn schema(&self) -> SchemaRef {
-        self.table_schema.clone()
+        Arc::clone(&self.table_schema)
     }
 
     fn supports_filters_pushdown(
@@ -1692,7 +1696,10 @@ pub fn unnest_with_options(
                 }
                 None => {
                     dependency_indices.push(index);
-                    Ok(vec![(original_qualifier.cloned(), original_field.clone())])
+                    Ok(vec![(
+                        original_qualifier.cloned(),
+                        Arc::clone(original_field),
+                    )])
                 }
             }
         })

datafusion/expr/src/logical_plan/plan.rs

@@ -762,9 +762,9 @@ impl LogicalPlan {
                 // If inputs are not pruned do not change schema
                 // TODO this seems wrong (shouldn't we always use the schema of the input?)
                 let schema = if schema.fields().len() == input_schema.fields().len() {
-                    schema.clone()
+                    Arc::clone(&schema)
                 } else {
-                    input_schema.clone()
+                    Arc::clone(input_schema)
                 };
                 Ok(LogicalPlan::Union(Union { inputs, schema }))
             }
@@ -850,7 +850,7 @@ impl LogicalPlan {
                 ..
             }) => Ok(LogicalPlan::Dml(DmlStatement::new(
                 table_name.clone(),
-                table_schema.clone(),
+                Arc::clone(table_schema),
                 op.clone(),
                 Arc::new(inputs.swap_remove(0)),
             ))),
@@ -863,13 +863,13 @@ impl LogicalPlan {
             }) => Ok(LogicalPlan::Copy(CopyTo {
                 input: Arc::new(inputs.swap_remove(0)),
                 output_url: output_url.clone(),
-                file_type: file_type.clone(),
+                file_type: Arc::clone(file_type),
                 options: options.clone(),
                 partition_by: partition_by.clone(),
             })),
             LogicalPlan::Values(Values { schema, .. }) => {
                 Ok(LogicalPlan::Values(Values {
-                    schema: schema.clone(),
+                    schema: Arc::clone(schema),
                     values: expr
                         .chunks_exact(schema.fields().len())
                         .map(|s| s.to_vec())
@@ -1028,9 +1028,9 @@ impl LogicalPlan {
                 let input_schema = inputs[0].schema();
                 // If inputs are not pruned do not change schema.
                 let schema = if schema.fields().len() == input_schema.fields().len() {
-                    schema.clone()
+                    Arc::clone(schema)
                 } else {
-                    input_schema.clone()
+                    Arc::clone(input_schema)
                 };
                 Ok(LogicalPlan::Union(Union {
                     inputs: inputs.into_iter().map(Arc::new).collect(),
@@ -1074,7 +1074,7 @@ impl LogicalPlan {
                 assert_eq!(inputs.len(), 1);
                 Ok(LogicalPlan::Analyze(Analyze {
                     verbose: a.verbose,
-                    schema: a.schema.clone(),
+                    schema: Arc::clone(&a.schema),
                     input: Arc::new(inputs.swap_remove(0)),
                 }))
             }
@@ -1088,7 +1088,7 @@ impl LogicalPlan {
                     verbose: e.verbose,
                     plan: Arc::new(inputs.swap_remove(0)),
                     stringified_plans: e.stringified_plans.clone(),
-                    schema: e.schema.clone(),
+                    schema: Arc::clone(&e.schema),
                     logical_optimization_succeeded: e.logical_optimization_succeeded,
                 }))
             }
@@ -1370,7 +1370,7 @@ impl LogicalPlan {
         param_values: &ParamValues,
     ) -> Result<LogicalPlan> {
         self.transform_up_with_subqueries(|plan| {
-            let schema = plan.schema().clone();
+            let schema = Arc::clone(plan.schema());
             plan.map_expressions(|e| {
                 e.infer_placeholder_types(&schema)?.transform_up(|e| {
                     if let Expr::Placeholder(Placeholder { id, .. }) = e {
@@ -2260,7 +2260,7 @@ impl Window {
         let fields: Vec<(Option<TableReference>, Arc<Field>)> = input
             .schema()
             .iter()
-            .map(|(q, f)| (q.cloned(), f.clone()))
+            .map(|(q, f)| (q.cloned(), Arc::clone(f)))
             .collect();
         let input_len = fields.len();
         let mut window_fields = fields;
@@ -3385,7 +3385,7 @@ digraph {
             vec![col("a")],
             Arc::new(LogicalPlan::EmptyRelation(EmptyRelation {
                 produce_one_row: false,
-                schema: empty_schema.clone(),
+                schema: Arc::clone(&empty_schema),
             })),
             empty_schema,
         );
@@ -3500,9 +3500,9 @@ digraph {
         );
         let scan = Arc::new(LogicalPlan::TableScan(TableScan {
             table_name: TableReference::bare("tab"),
-            source: source.clone(),
+            source: Arc::clone(&source) as Arc<dyn TableSource>,
             projection: None,
-            projected_schema: schema.clone(),
+            projected_schema: Arc::clone(&schema),
             filters: vec![],
             fetch: None,
         }));
@@ -3532,7 +3532,7 @@ digraph {
             table_name: TableReference::bare("tab"),
             source,
             projection: None,
-            projected_schema: unique_schema.clone(),
+            projected_schema: Arc::clone(&unique_schema),
             filters: vec![],
             fetch: None,
         }));

datafusion/expr/src/type_coercion/binary.rs

@@ -1048,16 +1048,16 @@ fn temporal_coercion(lhs_type: &DataType, rhs_type: &DataType) -> Option<DataTyp
                     match (lhs_tz.as_ref(), rhs_tz.as_ref()) {
                         // UTC and "+00:00" are the same by definition. Most other timezones
                         // do not have a 1-1 mapping between timezone and an offset from UTC
-                        ("UTC", "+00:00") | ("+00:00", "UTC") => Some(lhs_tz.clone()),
-                        (lhs, rhs) if lhs == rhs => Some(lhs_tz.clone()),
+                        ("UTC", "+00:00") | ("+00:00", "UTC") => Some(Arc::clone(lhs_tz)),
+                        (lhs, rhs) if lhs == rhs => Some(Arc::clone(lhs_tz)),
                         // can't cast across timezones
                         _ => {
                             return None;
                         }
                     }
                 }
-                (Some(lhs_tz), None) => Some(lhs_tz.clone()),
-                (None, Some(rhs_tz)) => Some(rhs_tz.clone()),
+                (Some(lhs_tz), None) => Some(Arc::clone(lhs_tz)),
+                (None, Some(rhs_tz)) => Some(Arc::clone(rhs_tz)),
                 (None, None) => None,
             };
 

datafusion/expr/src/type_coercion/functions.rs

@@ -598,7 +598,7 @@ fn coerced_from<'a>(
                             Arc::new(f_into.as_ref().clone().with_data_type(data_type));
                         Some(FixedSizeList(new_field, *size_from))
                     }
-                    Some(_) => Some(FixedSizeList(f_into.clone(), *size_from)),
+                    Some(_) => Some(FixedSizeList(Arc::clone(f_into), *size_from)),
                     _ => None,
                 }
             }
@@ -607,7 +607,7 @@ fn coerced_from<'a>(
         (Timestamp(unit, Some(tz)), _) if tz.as_ref() == TIMEZONE_WILDCARD => {
             match type_from {
                 Timestamp(_, Some(from_tz)) => {
-                    Some(Timestamp(unit.clone(), Some(from_tz.clone())))
+                    Some(Timestamp(unit.clone(), Some(Arc::clone(from_tz))))
                 }
                 Null | Date32 | Utf8 | LargeUtf8 | Timestamp(_, None) => {
                     // In the absence of any other information assume the time zone is "+00" (UTC).
@@ -715,12 +715,12 @@ mod tests {
     fn test_fixed_list_wildcard_coerce() -> Result<()> {
         let inner = Arc::new(Field::new("item", DataType::Int32, false));
         let current_types = vec![
-            DataType::FixedSizeList(inner.clone(), 2), // able to coerce for any size
+            DataType::FixedSizeList(Arc::clone(&inner), 2), // able to coerce for any size
         ];
 
         let signature = Signature::exact(
             vec![DataType::FixedSizeList(
-                inner.clone(),
+                Arc::clone(&inner),
                 FIXED_SIZE_LIST_WILDCARD,
             )],
             Volatility::Stable,
@@ -731,15 +731,15 @@ mod tests {
 
         // make sure it can't coerce to a different size
         let signature = Signature::exact(
-            vec![DataType::FixedSizeList(inner.clone(), 3)],
+            vec![DataType::FixedSizeList(Arc::clone(&inner), 3)],
             Volatility::Stable,
         );
         let coerced_data_types = data_types(&current_types, &signature);
         assert!(coerced_data_types.is_err());
 
         // make sure it works with the same type.
         let signature = Signature::exact(
-            vec![DataType::FixedSizeList(inner.clone(), 2)],
+            vec![DataType::FixedSizeList(Arc::clone(&inner), 2)],
             Volatility::Stable,
         );
         let coerced_data_types = data_types(&current_types, &signature).unwrap();

datafusion/expr/src/udaf.rs

@@ -106,8 +106,8 @@ impl AggregateUDF {
         Self::new_from_impl(AggregateUDFLegacyWrapper {
             name: name.to_owned(),
             signature: signature.clone(),
-            return_type: return_type.clone(),
-            accumulator: accumulator.clone(),
+            return_type: Arc::clone(return_type),
+            accumulator: Arc::clone(accumulator),
         })
     }
 
@@ -133,7 +133,10 @@ impl AggregateUDF {
     ///
     /// If you implement [`AggregateUDFImpl`] directly you should return aliases directly.
     pub fn with_aliases(self, aliases: impl IntoIterator<Item = &'static str>) -> Self {
-        Self::new_from_impl(AliasedAggregateUDFImpl::new(self.inner.clone(), aliases))
+        Self::new_from_impl(AliasedAggregateUDFImpl::new(
+            Arc::clone(&self.inner),
+            aliases,
+        ))
     }
 
     /// creates an [`Expr`] that calls the aggregate function.

datafusion/expr/src/udf.rs

@@ -87,8 +87,8 @@ impl ScalarUDF {
         Self::new_from_impl(ScalarUdfLegacyWrapper {
             name: name.to_owned(),
             signature: signature.clone(),
-            return_type: return_type.clone(),
-            fun: fun.clone(),
+            return_type: Arc::clone(return_type),
+            fun: Arc::clone(fun),
         })
     }
 
@@ -114,7 +114,7 @@ impl ScalarUDF {
     ///
     /// If you implement [`ScalarUDFImpl`] directly you should return aliases directly.
     pub fn with_aliases(self, aliases: impl IntoIterator<Item = &'static str>) -> Self {
-        Self::new_from_impl(AliasedScalarUDFImpl::new(self.inner.clone(), aliases))
+        Self::new_from_impl(AliasedScalarUDFImpl::new(Arc::clone(&self.inner), aliases))
     }
 
     /// Returns a [`Expr`] logical expression to call this UDF with specified
@@ -199,7 +199,7 @@ impl ScalarUDF {
     /// Returns a `ScalarFunctionImplementation` that can invoke the function
     /// during execution
     pub fn fun(&self) -> ScalarFunctionImplementation {
-        let captured = self.inner.clone();
+        let captured = Arc::clone(&self.inner);
         Arc::new(move |args| captured.invoke(args))
     }
 

datafusion/expr/src/udwf.rs

@@ -90,8 +90,8 @@ impl WindowUDF {
         Self::new_from_impl(WindowUDFLegacyWrapper {
             name: name.to_owned(),
             signature: signature.clone(),
-            return_type: return_type.clone(),
-            partition_evaluator_factory: partition_evaluator_factory.clone(),
+            return_type: Arc::clone(return_type),
+            partition_evaluator_factory: Arc::clone(partition_evaluator_factory),
         })
     }
 
@@ -117,7 +117,7 @@ impl WindowUDF {
     ///
     /// If you implement [`WindowUDFImpl`] directly you should return aliases directly.
     pub fn with_aliases(self, aliases: impl IntoIterator<Item = &'static str>) -> Self {
-        Self::new_from_impl(AliasedWindowUDFImpl::new(self.inner.clone(), aliases))
+        Self::new_from_impl(AliasedWindowUDFImpl::new(Arc::clone(&self.inner), aliases))
     }
 
     /// creates a [`Expr`] that calls the window function given

datafusion/expr/src/utils.rs

@@ -1199,7 +1199,7 @@ pub fn only_or_err<T>(slice: &[T]) -> Result<&T> {
 /// merge inputs schema into a single schema.
 pub fn merge_schema(inputs: Vec<&LogicalPlan>) -> DFSchema {
     if inputs.len() == 1 {
-        inputs[0].schema().clone().as_ref().clone()
+        inputs[0].schema().as_ref().clone()
     } else {
         inputs.iter().map(|input| input.schema()).fold(
             DFSchema::empty(),