rok commented on code in PR #7111:
URL: https://github.com/apache/arrow-rs/pull/7111#discussion_r2003517486


##########
parquet/src/file/writer.rs:
##########
@@ -171,7 +183,30 @@ impl<W: Write + Send> SerializedFileWriter<W> {
     /// Creates new file writer.
     pub fn new(buf: W, schema: TypePtr, properties: WriterPropertiesPtr) -> 
Result<Self> {
         let mut buf = TrackedWrite::new(buf);
-        Self::start_file(&mut buf)?;
+
+        #[cfg(feature = "encryption")]
+        let file_encryptor = match 
properties.file_encryption_properties.as_ref() {
+            None => None,
+            Some(encryption_props) => 
Some(Arc::new(FileEncryptor::new(encryption_props.clone())?)),
+        };
+
+        #[cfg(feature = "encryption")]
+        if properties.file_encryption_properties.is_some() {
+            properties
+                .file_encryption_properties
+                .clone()
+                .unwrap()
+                
.validate_encrypted_column_names(SchemaDescriptor::new(schema.clone()))?;
+        }

Review Comment:
   Do you mean:
   ```rust
           Ok(Self {
               buf,
               schema: schema.clone(),
               descr: Arc::new(schema_descriptor),
   ```



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