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  1. Parquet
  2. PARQUET-1791

Add 'prune' command to parquet-tools

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      During data retention, there is a need to remove unused or personal columns. Adding a 'prune' command in Parquet-tool to remove columns and retain all other columns unchanged. The way it works should be like 'merge' command in Parquet-tools, for example moving the column chunks as a whole.  

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              shangx@uber.com Xinli Shang
              shangx@uber.com Xinli Shang
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