liurenjie1024 commented on code in PR #323:
URL: https://github.com/apache/iceberg-rust/pull/323#discussion_r1579248989


##########
crates/iceberg/src/scan.rs:
##########
@@ -158,8 +196,24 @@ impl TableScan {
             .await?;
 
             // Generate data file stream
-            let mut entries = iter(manifest_list.entries());
-            while let Some(entry) = entries.next().await {
+            for entry in manifest_list.entries() {
+                // If this scan has a filter, check the partition evaluator 
cache for an existing
+                // PartitionEvaluator that matches this manifest's partition 
spec ID.
+                // Use one from the cache if there is one. If not, create one, 
put it in
+                // the cache, and take a reference to it.
+                #[allow(clippy::map_entry)]
+                if let Some(filter) = filter.as_ref() {
+                    if 
!manifest_evaluator_cache.contains_key(&entry.partition_spec_id) {

Review Comment:
   TBH I prefer the entry api which make code more concise, but this is not a 
blocker.



##########
crates/iceberg/src/scan.rs:
##########
@@ -186,6 +240,25 @@ impl TableScan {
         .boxed())
     }
 
+    fn create_manifest_evaluator(
+        id: i32,
+        schema: SchemaRef,
+        table_metadata: Arc<TableMetadata>,
+        case_sensitive: bool,
+        filter: &Predicate,
+    ) -> crate::Result<ManifestEvaluator> {
+        let bound_predicate = filter.bind(schema.clone(), 
case_sensitive).unwrap();

Review Comment:
   ```suggestion
           let bound_predicate = filter.bind(schema.clone(), case_sensitive)?;
   ```
   
   We should not panic here.



##########
crates/iceberg/src/scan.rs:
##########
@@ -186,6 +240,25 @@ impl TableScan {
         .boxed())
     }
 
+    fn create_manifest_evaluator(
+        id: i32,
+        schema: SchemaRef,
+        table_metadata: Arc<TableMetadata>,
+        case_sensitive: bool,
+        filter: &Predicate,
+    ) -> crate::Result<ManifestEvaluator> {
+        let bound_predicate = filter.bind(schema.clone(), 
case_sensitive).unwrap();
+
+        let partition_spec = table_metadata.partition_spec_by_id(id).unwrap();

Review Comment:
   ```suggestion
           let partition_spec = table_metadata.partition_spec_by_id(id)?;
   ```
   
   Why panic here?



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