joosthooz opened a new pull request #11810:
URL: https://github.com/apache/arrow/pull/11810


   This will only work for the Arrow IPC format, not for Parquet, because 
Parquet uses the raw LZ4 format instead of the framed format. 
   
   Still to figure out:
   
   - [ ]  Do we need to add tests to test if setting the compression level 
works as intended? (Or is this already covered by tests for the other formats 
that support levels)
   
   - [ ] Figure out the raw format for Parquet files
   The raw format does not support the compression level, but supports an 
acceleration value. This value works in opposite direction; increasing it 
speeds up the compression in expense of the ratio. The value can be set from 1 
to 65537, so that's also completely different from the compression level in the 
framing format (1 to 12).


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