Fix clippy issues

Author: rok

parquet/src/column/writer/mod.rs

@@ -3472,7 +3472,7 @@ mod tests {
             let string_col = batch.column(0).as_string_opt::<i32>().unwrap();
 
             let mut valid_count = 0;
-            for (_i, x) in string_col.iter().enumerate() {
+            for x in string_col.iter() {
                 if let Some(x) = x {
                     valid_count += 1;
                     assert_eq!(x, "parquet");

parquet/src/file/metadata/mod.rs

@@ -1225,7 +1225,7 @@ impl ColumnChunkMetaData {
         let crypto_metadata = self
             .column_crypto_metadata
             .as_ref()
-            .map(|c| column_crypto_metadata::to_thrift(c));
+            .map(column_crypto_metadata::to_thrift);
         #[cfg(not(feature = "encryption"))]
         let crypto_metadata = None;
 

parquet/src/file/metadata/writer.rs

@@ -277,10 +277,7 @@ impl<'a, W: Write> ThriftMetadataWriter<'a, W> {
         file_encryptor: &Arc<FileEncryptor>,
     ) -> Result<crate::format::FileCryptoMetaData> {
         let properties = file_encryptor.properties();
-        let supply_aad_prefix = match properties.aad_prefix() {
-            Some(_) => Some(!properties.store_aad_prefix()),
-            None => None,
-        };
+        let supply_aad_prefix = properties.aad_prefix().map(|_| !properties.store_aad_prefix());
         let encryption_algorithm = AesGcmV1 {
             aad_prefix: properties.aad_prefix().cloned(),
             aad_file_unique: Some(file_encryptor.aad_file_unique().clone()),