bkietz commented on a change in pull request #11810:
URL: https://github.com/apache/arrow/pull/11810#discussion_r762220443



##########
File path: cpp/src/arrow/util/compression_lz4.cc
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@@ -313,6 +335,13 @@ class Lz4FrameCodec : public Codec {
 
 class Lz4Codec : public Codec {
  public:
+  Lz4Codec() : compression_level_(kUseDefaultCompressionLevel) {}

Review comment:
       Since we coerce `kUse$x -> k$x`, it seems this should be:
   ```suggestion
     Lz4Codec() : compression_level_(kDefaultCompressionLevel) {}
   ```
   
   ... but this constructor isn't used anymore AFAICT, so we could just delete 
it




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