I've been trying out IO with Arrow's extension types and I was able write a parquet file but reading it back causes an error: "pyarrow.lib.ArrowInvalid: Unsupported nested type: ...". Looking at the code for the parquet reader, it checks nested types and only allows a few specific ones. Is this a known limitation? I couldn't find a JIRA but I'll make one if it is. Alternatively, I was able to convert my extension array to/from a Pandas DataFrame and read/write to a Feather file, which is awesome - nice work!
Thanks, Bryan
