[parquet] can't load parquet directory anymore: IsADirectoryError

[mr-majkel]

Small description

Hi @saulpw @anjakefala @takacsd - it seems that forcing opening the path as file with .open() - introduced with #2133 - breaks the use case where the multiple parquet files are stored in a directory, and this directory is then read by visidata. This is common with Hive partitioning or when working with spark. A simple fix would be to check if the path is a directory with os.path.is_dir() and then retaining old behavior of passing it as a string to read_table(). If it is not an existing directory, we move to the new way of opening as a binary buffer.

I have already added this workaround to my clone of visidata, and it fixes my issue, but maybe you have some better ideas how to handle it instead of if-else statement in the ParquetSheet.

Expected result

vd -f parquet parquet_dir

should load a parquet into visidata

Actual result with screenshot

Additional context

# freshest develop
visidata@9fd728b72c115e50e99c24b455caaf020381b48e

pyarrow==12.0.0
python 3.10.2

[saulpw]

This is perfect, thanks for the report and the fix @mr-majkel !