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https://issues.apache.org/jira/browse/ARROW-17774?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17624838#comment-17624838
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Miles Granger edited comment on ARROW-17774 at 10/27/22 3:51 AM:
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Thanks [~westonpace], good timing. :)
I added a PR [#14525 |https://github.com/apache/arrow/pull/14525] with some
simple checks, let me know if you have suggestions there or if you don't think
it's worth it I'm fine just closing this and the PR. (y)
was (Author: JIRAUSER293894):
Thanks [~westonpace], good timing. :)
I added a PR [#14525 | https://github.com/apache/arrow/pull/14525] with some
simple checks, let me know if you have suggestions there or if you don't think
it's worth it I'm find just closing this and the PR. (y)
> [Python] write csv decimal cast error
> -------------------------------------
>
> Key: ARROW-17774
> URL: https://issues.apache.org/jira/browse/ARROW-17774
> Project: Apache Arrow
> Issue Type: Bug
> Components: C++
> Affects Versions: 8.0.0
> Reporter: Alejandro Marco Ramos
> Assignee: Miles Granger
> Priority: Major
> Labels: pull-request-available
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> Hi, when try to write table with any field in `Decimal128` type, arrow raises
> with this message:
> {code:java}
> In [136]: ds.write_dataset(table, "data", format="csv")
> ---------------------------------------------------------------------------
> ArrowNotImplementedError Traceback (most recent call last)
> Cell In [136], line 1
> ----> 1 ds.write_dataset(table, "data", format="csv")
> File
> c:\users\documents\projects\.venv\lib\site-packages\pyarrow\dataset.py:930,
> in write_dataset(data, base_dir, basename_template, format, partitioning,
> partitioning_flavor, schema, filesystem, file_options, use_threads,
> max_partitions, max_open_files, max_rows_per_file, min_rows_per_group,
> max_rows_per_group, file_visitor, existing_data_behavior, create_dir)
> 927 raise ValueError("Cannot specify a schema when writing a
> Scanner")
> 928 scanner = data
> --> 930 _filesystemdataset_write(
> 931 scanner, base_dir, basename_template, filesystem, partitioning,
> 932 file_options, max_partitions, file_visitor,
> existing_data_behavior,
> 933 max_open_files, max_rows_per_file,
> 934 min_rows_per_group, max_rows_per_group, create_dir
> 935 )
> File
> c:\users\documents\projects\.venv\lib\site-packages\pyarrow\_dataset.pyx:2737,
> in pyarrow._dataset._filesystemdataset_write()
> File
> c:\users\documents\projects\.venv\lib\site-packages\pyarrow\error.pxi:121, in
> pyarrow.lib.check_status()
> ArrowNotImplementedError: Unsupported cast from decimal128(21, 15) to utf8
> using function cast_string{code}
> my data is:
> {noformat}
> In [137]: table
> Out[137]:
> pyarrow.Table
> col1: int64
> col2: double
> col3: decimal128(21, 15)
> col4: string
> ----
> col1: [[1,2,3,0]]
> col2: [[2.7,0,3.24,3]]
> col3: [[-304236.460000000000000,0.E-15,0.E-15,0.E-15]]
> col4: [["primera","segunda","tercera","cuarta"]]{noformat}
>
> Thanks in advance.
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