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https://issues.apache.org/jira/browse/ARROW-4885?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17661907#comment-17661907
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Rok Mihevc commented on ARROW-4885:
-----------------------------------
This issue has been migrated to [issue
#21395|https://github.com/apache/arrow/issues/21395] on GitHub. Please see the
[migration documentation|https://github.com/apache/arrow/issues/14542] for
further details.
> [Python] read_csv() can't handle decimal128 columns
> ---------------------------------------------------
>
> Key: ARROW-4885
> URL: https://issues.apache.org/jira/browse/ARROW-4885
> Project: Apache Arrow
> Issue Type: Bug
> Components: C++, Python
> Affects Versions: 0.12.1
> Environment: Python: 3.7.2, 2.7.15
> PyArrow: 0.12.1
> OS: MacOS 10.13.4 (High Sierra)
> Reporter: Diego Argueta
> Assignee: Micah Kornfield
> Priority: Major
> Labels: csv, pull-request-available
> Fix For: 0.14.0
>
> Time Spent: 1.5h
> Remaining Estimate: 0h
>
> h1. Summary
> {\{read_csv()}} crashes when given a {{decimal128}} column type in its
> convert options. The cause is that there's no converter listed
> [here|https://github.com/apache/arrow/blob/master/cpp/src/arrow/csv/converter.cc#L301-L315].
> h1. To Reproduce
> 1) First, create a CSV file like so and save it somewhere:
> {code:java}
> Header
> 123.45
> {code}
> 2) Run the following code on Python 2 or 3:
> {code:java}
> import pyarrow.csv as pa_csv
> import pyarrow as pa
> import io
> types = {'Header': pa.decimal128(11, 2)}
> convert_options = pa_csv.ConvertOptions(column_types=types)
> pa_csv.read_csv('/home/dargueta/Desktop/test.csv',
> convert_options=convert_options)
> {code}
> read_csv() crashes with the following exception:
> {code:java}
> Traceback (most recent call last):
> File "<stdin>", line 1, in <module>
> File "pyarrow/_csv.pyx", line 397, in pyarrow._csv.read_csv
> File "pyarrow/error.pxi", line 89, in pyarrow.lib.check_status
> pyarrow.lib.ArrowNotImplementedError: CSV conversion to decimal(11, 2) is not
> supported
> CSV conversion to decimal(11, 2) is not supported
> {code}
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