pitrou commented on a change in pull request #7571:
URL: https://github.com/apache/arrow/pull/7571#discussion_r447002338



##########
File path: cpp/src/arrow/ipc/options.h
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@@ -66,6 +67,10 @@ struct ARROW_EXPORT IpcWriteOptions {
   /// like compression
   bool use_threads = true;
 
+  /// \brief Format version to use for IPC messages and their
+  /// metadata. Presently using V4 version (readable by v0.8.0 and later).
+  MetadataVersion metadata_version = MetadataVersion::V4;

Review comment:
       I find it a bit weird to expose this an option. Will we be able to write 
data compatible with other metadata versions?




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