Jakub Okoński created ARROW-5030:
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Summary: read_row_group fails with Nested data conversions not
implemented for chunked array outputs
Key: ARROW-5030
URL: https://issues.apache.org/jira/browse/ARROW-5030
Project: Apache Arrow
Issue Type: Bug
Affects Versions: 0.12.0
Reporter: Jakub Okoński
Hey, I'm trying to concatenate two files and to avoid reading everything to
memory at once, I wanted to use `read_row_group` for my solution, but it fails.
I think it's due to fields like these:
{{pyarrow.Field<to: list<item: string>>}}
But I'm not sure. Is this a duplicate? The issue linked in the code is resolved
https://github.com/apache/arrow/blob/fd0b90a7f7e65fde32af04c4746004a1240914cf/cpp/src/parquet/arrow/reader.cc#L915
Stacktrace is
{{ File "/data/teftel/teftel-data/teftel_data/parquet_stream.py", line 163, in
read_batches}}
{{ table = pf.read_row_group(ix, columns=self._columns)}}
{{ File
"/home/kuba/.local/share/virtualenvs/teftel-o6G5iH_l/lib/python3.6/site-packages/pyarrow/parquet.py",
line 186, in read_row_group}}
{{ use_threads=use_threads)}}
{{ File "pyarrow/_parquet.pyx", line 695, in
pyarrow._parquet.ParquetReader.read_row_group}}
{{ File "pyarrow/error.pxi", line 89, in pyarrow.lib.check_status}}
{{pyarrow.lib.ArrowNotImplementedError: Nested data conversions not implemented
for chunked array outputs}}
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