Updates for API change

Author: alamb

datafusion/core/src/physical_plan/projection.rs

@@ -212,7 +212,7 @@ fn get_field_metadata(
     input_schema
         .field_with_name(name)
         .ok()
-        .and_then(|f| f.metadata().as_ref().cloned())
+        .and_then(|f| f.metadata().cloned())
 }
 
 fn stats_projection(

datafusion/core/src/physical_plan/sorts/sort.rs

@@ -1143,7 +1143,7 @@ mod tests {
         // explicitlty ensure the metadata is present
         assert_eq!(
             result[0].schema().fields()[0].metadata(),
-            &Some(field_metadata)
+            Some(&field_metadata)
         );
         assert_eq!(result[0].schema().metadata(), &schema_metadata);