wgtmac commented on code in PR #36574:
URL: https://github.com/apache/arrow/pull/36574#discussion_r1302682995


##########
cpp/src/parquet/page_index.h:
##########
@@ -186,8 +191,7 @@ class PARQUET_EXPORT PageIndexReader {
   /// that creates this PageIndexReader.
   static std::shared_ptr<PageIndexReader> Make(
       ::arrow::io::RandomAccessFile* input, std::shared_ptr<FileMetaData> 
file_metadata,
-      const ReaderProperties& properties,
-      std::shared_ptr<InternalFileDecryptor> file_decryptor = NULLPTR);
+      const ReaderProperties& properties, InternalFileDecryptor* 
file_decryptor);

Review Comment:
   OK. `std::shared_ptr<Decryptor>` is due to the expectation of 
`DeserializeMessage` call.



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