pitrou commented on a change in pull request #9782:
URL: https://github.com/apache/arrow/pull/9782#discussion_r614981828



##########
File path: cpp/src/parquet/types.cc
##########
@@ -69,11 +69,6 @@ std::unique_ptr<Codec> GetCodec(Compression::type codec, int 
compression_level)
     throw ParquetException(ss.str());
   }
 
-  if (codec == Compression::LZ4) {

Review comment:
       We're not deprecating anything, `Compression::LZ4` simply means "use the 
LZ4 raw (block) format" as it was always meant to be. We're unable to reliably 
produce Hadoop-readable files anywhere, it would be counter-productive to still 
produce them by default.

##########
File path: cpp/src/parquet/types.cc
##########
@@ -69,11 +69,6 @@ std::unique_ptr<Codec> GetCodec(Compression::type codec, int 
compression_level)
     throw ParquetException(ss.str());
   }
 
-  if (codec == Compression::LZ4) {

Review comment:
       We're not deprecating anything, `Compression::LZ4` simply means "use the 
LZ4 raw (block) format" as it was always meant to be. We're unable to reliably 
produce Hadoop-readable files anyway, it would be counter-productive to still 
produce them by default.




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