liurenjie1024 commented on code in PR #122:
URL: https://github.com/apache/iceberg-rust/pull/122#discussion_r1430828303


##########
crates/iceberg/src/spec/manifest_list.rs:
##########
@@ -820,15 +834,24 @@ pub(super) mod _serde {
                     .zip(partition_types)
                     .map(|(v, field)| v.try_into(&field.field_type))
                     .collect::<Result<Vec<_>, _>>()
-            })
-            .transpose()?
-            .unwrap_or_default())
+            } else {
+                Err(Error::new(
+                    crate::ErrorKind::DataInvalid,

Review Comment:
   I'm expecting a better error message with more context, for example, the 
manifest list file path, the entry path, spec id.



##########
crates/iceberg/src/spec/manifest.rs:
##########
@@ -79,6 +79,22 @@ impl Manifest {
 
         Ok(Manifest { metadata, entries })
     }
+
+    /// Upgrade the format version of this manifest.
+    pub fn upgrade_version(&mut self, format_version: FormatVersion) -> 
Result<(), Error> {

Review Comment:
   +1 for this concern. Version upgrade is part of transaction api, it involves 
full rewrite of all things like snapshot, and should not do it here.



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