ZENOTME commented on code in PR #176:
URL: https://github.com/apache/iceberg-rust/pull/176#discussion_r1469148875


##########
crates/iceberg/src/io.rs:
##########
@@ -278,7 +288,7 @@ impl OutputFile {
     }
 
     /// Creates output file for writing.
-    pub async fn writer(&self) -> Result<impl FileWrite> {
+    pub async fn writer(&self) -> Result<Writer> {

Review Comment:
   This interface looks weird because returning a type here can't let us 
determine the type in `ParquetWriter`. So I modify it to a specific type here 
temporarily. 
   
   I think if we want to make it generic, maybe we need to make `OutputFile` a 
trait and let OutputFile bind an associate type like🤔
   ```
   trait OutputFile {
      type writer: FileWriter;
      ...
   }
   ```
   
   cc @liurenjie1024 



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