Cross-platform viewer for Apache Parquet files using Qt for Python.

This is currently just a proof of concept. It would also be useful to have a cross-platform GUI to view metatadata for a Parquet file. Would the same application do both?

This is useful for Parquet files that are small enough to fit on local storage for a workstation or laptop. For remote storage, network latency and throughput would matter a lot.

TODO:

• Package as stand-alone Windows and Mac executables.
• Handle Windows and Mac file associations. (Double click file to open.)
  • KDE plasma?
  • GNOME3?

Possible enhancements:

• Read Parquet files in chunks as you scoll, for files that fit on disk but not in RAM.
  • On the other hand, are these so big that a metadata viewer and summary statistics are all that make sense?
• Column sorting and filtering
• Support Apache Feather files
• Metadata viewer:
  • https://parquet.apache.org/docs/file-format/metadata/
  • Compression algorithm
  • Total number of rows
  • Column chunk size or number of chunks
  • Column names
  • Column types
  • Number of NULLs in a Column
  • Summary Statistics by Column