[ARROW-601] Some logical types not supported when loading Parquet

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.2.0
• Fix Version/s: 0.5.0
• Component/s: Python
• Labels: parquet
• External issue URL: https://github.com/apache/arrow/issues/16232
• Assignee: Wes McKinney
• Reporter: Saul Shanabrook
• Created: 03/Mar/17 18:41
• Updated: 11/Jan/23 07:09
• Resolved: 17/Jul/17 00:00

Description

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

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

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

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);
}

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?

Issue Links

• blocks: ARROW-1052 Arrow 0.5.0 release
• is blocked by: PARQUET-910 C++: Support TIME logical type in parquet_arrow
• is blocked by: PARQUET-911 C++: Support nested structs in parquet_arrow
• requires: ARROW-1183 [Python] Implement time type conversions in to_pandas