[jira] [Created] (ARROW-17774) Python: write csv cast error

["Alejandro Marco Ramos (Jira)" <ji...@apache.org>]

Alejandro Marco Ramos created ARROW-17774:
---------------------------------------------

             Summary: Python: write csv 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


Hi, when try to write table with any field in `Decimal128` type, arrow raises with this message:
{noformat}
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{noformat}
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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