Ted-Jiang commented on a change in pull request #1205:
URL: https://github.com/apache/arrow-rs/pull/1205#discussion_r787446606



##########
File path: arrow/src/json/writer.rs
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@@ -178,31 +178,29 @@ pub fn array_to_json_array(array: &ArrayRef) -> 
Vec<Value> {
         DataType::UInt64 => primitive_array_to_json::<UInt64Type>(array),
         DataType::Float32 => primitive_array_to_json::<Float32Type>(array),
         DataType::Float64 => primitive_array_to_json::<Float64Type>(array),
-        DataType::List(_) => as_list_array(array)
+        DataType::List(_) => Ok(as_list_array(array)
             .iter()
             .map(|maybe_value| match maybe_value {
-                Some(v) => Value::Array(array_to_json_array(&v)),
+                Some(v) => Value::Array(array_to_json_array(&v).unwrap()),

Review comment:
       when i change unwarp() with ?
   the trait bound Value: FromResidual<std::result::Result<Infallible, 
ArrowError>>is not satisfied
   Can someone give some advice?




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