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The ‘why’ is referenced in the bibliography at the end of the readme; this repo is not meant to be consumed standalone. Start with the paper instead:

I also had no idea what they were talking about, but there's good points about how hardware oblivious and somewhat global is Parquet around metadata.

I found this post interesting,

Yeah it seems like most of this can be handled by some more dev hours to Parquet

Paper mentions Parquet, ORC, Nimble, Lance, TSFile, Bullion, and BtrBlocks.