Fix clippy errors

Author: nuno-faria

examples/datafusion-ffi-example/Cargo.lock

@@ -198,7 +198,7 @@ impl TableSource for SqlTableSource {
             .collect()
     }
 
-    fn get_logical_plan(&self) -> Option<Cow<datafusion::logical_expr::LogicalPlan>> {
+    fn get_logical_plan(&self) -> Option<Cow<'_, datafusion::logical_expr::LogicalPlan>> {
         None
     }
 }

src/common/schema.rs

@@ -152,7 +152,7 @@ fn get_python_formatter_with_config(py: Python) -> PyResult<PythonFormatter> {
 }
 
 /// Get the Python formatter from the datafusion.dataframe_formatter module
-fn import_python_formatter(py: Python) -> PyResult<Bound<'_, PyAny>> {
+fn import_python_formatter(py: Python<'_>) -> PyResult<Bound<'_, PyAny>> {
     let formatter_module = py.import("datafusion.dataframe_formatter")?;
     let get_formatter = formatter_module.getattr("get_formatter")?;
     get_formatter.call0()

src/dataframe.rs

@@ -698,7 +698,7 @@ impl PyExpr {
 
     /// Create a [Field] representing an [Expr], given an input [LogicalPlan] to resolve against
     pub fn expr_to_field(expr: &Expr, input_plan: &LogicalPlan) -> PyDataFusionResult<Arc<Field>> {
-        let fields = exprlist_to_fields(&[expr.clone()], input_plan)?;
+        let fields = exprlist_to_fields(std::slice::from_ref(expr), input_plan)?;
         Ok(fields[0].1.clone())
     }
     fn _types(expr: &Expr) -> PyResult<DataTypeMap> {