[GitHub] [arrow] mqy commented on a change in pull request #9058: ARROW-10996: [Rust] change return value type of get_arrow_schema_from_metadata()

[GitBox <gi...@apache.org>]

mqy commented on a change in pull request #9058:
URL: https://github.com/apache/arrow/pull/9058#discussion_r550750646



##########
File path: rust/parquet/src/arrow/schema.rs
##########
@@ -42,12 +42,17 @@ pub fn parquet_to_arrow_schema(
     key_value_metadata: &Option<Vec<KeyValue>>,
 ) -> Result<Schema> {
     let mut metadata = parse_key_value_metadata(key_value_metadata).unwrap_or_default();
-    let arrow_schema_metadata = metadata
+    let maybe_schema = metadata
         .remove(super::ARROW_SCHEMA_META_KEY)
         .map(|encoded| get_arrow_schema_from_metadata(&encoded));
 
+    let arrow_schema_metadata = match maybe_schema {

Review comment:
       @jorgecarleitao thank you for the tip!
   
   The codes were updated to use `map_or` for flipping `Option<Result>` to `Result<Option>`.
   BTW, I found some similar usage of `map_or` in `parquet/src/column/writer.rs` 🥇 




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