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From "Saul Shanabrook (JIRA)" <j...@apache.org>
Subject [jira] [Created] (ARROW-601) Some logical types not supported when loading Parquet
Date Fri, 03 Mar 2017 18:42:45 GMT
Saul Shanabrook created ARROW-601:
-------------------------------------

             Summary: Some logical types not supported when loading Parquet
                 Key: ARROW-601
                 URL: https://issues.apache.org/jira/browse/ARROW-601
             Project: Apache Arrow
          Issue Type: Bug
          Components: Python
    Affects Versions: 0.2.0
            Reporter: Saul Shanabrook
         Attachments: t.parquet

When I try to read a parquet file with some logical types in it, pyarrow says they are not
supported:

{code}
table = pq.read_table('t.parquet')
---------------------------------------------------------------------------
ArrowException                            Traceback (most recent call last)
<ipython-input-14-b7190e66bcb5> in <module>()
----> 1 table = pq.read_table('parquet/t')

/opt/conda/lib/python3.5/site-packages/pyarrow/parquet.py in read_table(source, columns, nthreads,
metadata)
    113 
    114     pf = ParquetFile(source, metadata=metadata)
--> 115     return pf.read(columns=columns, nthreads=nthreads)
    116 
    117 

/opt/conda/lib/python3.5/site-packages/pyarrow/parquet.py in read(self, nrows, columns, nthreads)
     78 
     79         return self.reader.read(column_indices=column_indices,
---> 80                                 nthreads=nthreads)
     81 
     82 

/opt/conda/lib/python3.5/site-packages/pyarrow/_parquet.pyx in pyarrow._parquet.ParquetReader.read
(/feedstock_root/build_artefacts/pyarrow_1488133203047/work/arrow-f6924ad83bc95741f003830892ad4815ca3b70fd/python/build/temp.linux-x86_64-3.5/_parquet.cxx:7706)()

/opt/conda/lib/python3.5/site-packages/pyarrow/error.pyx in pyarrow.error.check_status (/feedstock_root/build_artefacts/pyarrow_1488133203047/work/arrow-f6924ad83bc95741f003830892ad4815ca3b70fd/python/build/temp.linux-x86_64-3.5/error.cxx:1197)()

ArrowException: NotImplemented: Unhandled logical type for int32
{code}

This is the schema of the parquet file (see attached):

{code}
optional group root {
  optional int64 instant (TIMESTAMP_MILLIS);
  optional int32 time (TIME_MILLIS);
  optional double a-double;
  optional int64 another-int;
  optional binary a-string (UTF8);
  optional group list (LIST) {
    repeated group list {
      optional int64 element;
    }
  }
  optional boolean a-boolean;
  optional group a-group {
    optional boolean bool;
    optional int64 another;
  }
  optional int64 an-int;
  optional int32 a-date (DATE);
}
{code}

I assume this is because not pyarrow doesn't support loading all the parquet logical types
yet. Is there someplace I can look (even if it's not documented, just in the codebase), where
I can find what types are supported currently and which are not?
 



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