Xinli Shang created PARQUET-1872:

             Summary: Add TransCompression command 
                 Key: PARQUET-1872
             Project: Parquet
          Issue Type: Improvement
          Components: parquet-mr
    Affects Versions: 1.12.0
            Reporter: Xinli Shang
            Assignee: Xinli Shang

When ZSTD becomes more popular, there is a need to translate existing data ZSTD 
compressed which can achieve a higher compression ratio. It would be useful if 
we can have a tool to convert a Parquet file directly by just 
decompressing/compressing each page without decoding/encoding or assembling the 
record because it is much faster. The initial result shows it is ~5 times 

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