[jira] [Created] (ARROW-15233) pyarrow.dataset.dataset loses type information when reading parquet files

["Jim Fulton (Jira)" <ji...@apache.org>]

Jim Fulton created ARROW-15233:
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             Summary: pyarrow.dataset.dataset loses type information when reading parquet files
                 Key: ARROW-15233
                 URL: https://issues.apache.org/jira/browse/ARROW-15233
             Project: Apache Arrow
          Issue Type: Bug
          Components: Python
    Affects Versions: 6.0.1
         Environment: Ubuntu 20.2, Python 3.8.10
            Reporter: Jim Fulton


When reading a parquet containing time data:

 

{{>>> import pyarrow.dataset}}
{{>>> ds = pyarrow.dataset.dataset('foo.parquet', format='parquet')}}
{{>>> ds.schema[1].type}}
{{DataType(time32[ms])}}

I get {{DataType}} rather than {{{}Time32Type{}}}, which means I can't query time units.

I assume this is an issue for other non-basic types.

I can write code to scrape the type's string representation. Is there a better way?

 



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