[jira] [Commented] (ARROW-5030) [Python] read_row_group fails with Nested data conversions not implemented for chunked array outputs
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https://issues.apache.org/jira/browse/ARROW-5030?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17528890#comment-17528890
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Judah commented on ARROW-5030:
--
[~wesm_impala_7e40] I'm also running into this issue. Is this likely to be
fixed / easy to fix? I'd be happy to give it a go but not really sure where to
start.
> [Python] 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
> Components: C++, Python
>Affects Versions: 0.12.0
>Reporter: Jakub Okoński
>Priority: Major
> Labels: parquet
>
> 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>}}
>
> 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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[jira] [Issue Comment Deleted] (ARROW-14196) [C++][Parquet] Default to compliant nested types in Parquet writer
[ https://issues.apache.org/jira/browse/ARROW-14196?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Judah updated ARROW-14196: -- Comment: was deleted (was: [~trucnguyenlam] Is this something that could be flipped now? https://github.com/pandas-dev/pandas/pull/43690#pullrequestreview-760364590) > [C++][Parquet] Default to compliant nested types in Parquet writer > -- > > Key: ARROW-14196 > URL: https://issues.apache.org/jira/browse/ARROW-14196 > Project: Apache Arrow > Issue Type: Improvement > Components: C++, Parquet >Reporter: Joris Van den Bossche >Priority: Major > > In C++ there is already an option to get the "compliant_nested_types" (to > have the list columns follow the Parquet specification), and ARROW-11497 > exposed this option in Python. > This is still set to False by default, but in the source it says "TODO: At > some point we should flip this.", and in ARROW-11497 there was also some > discussion about what it would take to change the default. > cc [~emkornfield] [~apitrou] -- This message was sent by Atlassian Jira (v8.3.4#803005)
[jira] [Commented] (ARROW-14196) [C++][Parquet] Default to compliant nested types in Parquet writer
[ https://issues.apache.org/jira/browse/ARROW-14196?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17423299#comment-17423299 ] Judah commented on ARROW-14196: --- [~trucnguyenlam] Is this something that could be flipped now? https://github.com/pandas-dev/pandas/pull/43690#pullrequestreview-760364590 > [C++][Parquet] Default to compliant nested types in Parquet writer > -- > > Key: ARROW-14196 > URL: https://issues.apache.org/jira/browse/ARROW-14196 > Project: Apache Arrow > Issue Type: Improvement > Components: C++, Parquet >Reporter: Joris Van den Bossche >Priority: Major > > In C++ there is already an option to get the "compliant_nested_types" (to > have the list columns follow the Parquet specification), and ARROW-11497 > exposed this option in Python. > This is still set to False by default, but in the source it says "TODO: At > some point we should flip this.", and in ARROW-11497 there was also some > discussion about what it would take to change the default. > cc [~emkornfield] [~apitrou] -- This message was sent by Atlassian Jira (v8.3.4#803005)
