liurenjie1024 commented on code in PR #79:
URL: https://github.com/apache/iceberg-rust/pull/79#discussion_r1357853771


##########
crates/iceberg/src/spec/partition.rs:
##########
@@ -54,6 +56,24 @@ impl PartitionSpec {
     pub fn builder() -> PartitionSpecBuilder {
         PartitionSpecBuilder::default()
     }
+
+    /// Construct the partition type from schema
+    pub fn partition_type(&self, schema: &Schema) -> Result<StructType, Error> 
{
+        let mut fields = Vec::with_capacity(self.fields.len());
+        for field in &self.fields {
+            let field = schema.field_by_id(field.source_id).ok_or_else(|| {

Review Comment:
   I think this is incorrect? The partition type should be determined by type 
after transformation.



##########
crates/iceberg/src/spec/values.rs:
##########
@@ -966,6 +978,547 @@ mod timestamptz {
     }
 }
 
+mod serde {

Review Comment:
   I would suggest to move this into another pr and resolve them first, 
otherwise this pr would get too large to review.



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