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Posted to issues@arrow.apache.org by "Saul Shanabrook (JIRA)" <ji...@apache.org> on 2017/03/03 18:42:45 UTC
[jira] [Created] (ARROW-601) Some logical types not supported when
loading Parquet
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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