MarcoLugo commented on code in PR #3095:
URL: https://github.com/apache/avro/pull/3095#discussion_r1716874279


##########
lang/rust/avro/src/codec.rs:
##########
@@ -49,7 +49,13 @@ pub enum Codec {
     /// CRC32 checksum of the uncompressed data in the block.
     Snappy,
     #[cfg(feature = "zstandard")]
+    /// The `Zstandard` codec uses Facebook's 
[Zstandard](https://facebook.github.io/zstd/) with the
+    /// default compression level.
     Zstandard,
+    #[cfg(feature = "zstandard")]
+    /// This codec is the same as `Zstandard` but allows specifying the 
compression level.
+    #[strum(disabled)]
+    ZstandardWithLevel(ZstandardLevel),

Review Comment:
   I added a similar struct for zstd but for now I ended up leaving out the 
`dictionary` as it would be required for decoding as well and so it would need 
to go into the header metadata and I'm not sure how to do that at the moment. 
I'll need to read the avro spec in more detail, maybe this could be a future PR 
in order to avoid blocking this one?
   I also made the new settings structs public so they're visible in the docs 
and can be used.



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