[jira] [Created] (ARROW-8567) [Python] pa.array() sometimes ignore "safe=False"

["Antoine Pitrou (Jira)" <ji...@apache.org>]

Antoine Pitrou created ARROW-8567:
-------------------------------------

             Summary: [Python] pa.array() sometimes ignore "safe=False"
                 Key: ARROW-8567
                 URL: https://issues.apache.org/jira/browse/ARROW-8567
             Project: Apache Arrow
          Issue Type: Bug
          Components: Python
    Affects Versions: 0.17.0
            Reporter: Antoine Pitrou


Generally, {{pa.array(data).cast(sometype, safe=...)}} is equivalent to
{{pa.array(data, sometype, safe=...)}}. Consider the following:

{code:python}
>>> pa.array([Decimal('12.34')]).cast(pa.int32(), safe=False)                                                                                                               
<pyarrow.lib.Int32Array object at 0x7efbbd1556e0>
[
  12
]
>>> pa.array([Decimal('12.34')], pa.int32(), safe=False)                                                                                                                    
<pyarrow.lib.Int32Array object at 0x7efbbd13dad0>
[
  12
]
{code}

However, that is not always the case:
{code:python}
>>> pa.array([Decimal('1234')]).cast(pa.int8(), safe=False)                                                                                                                 
<pyarrow.lib.Int8Array object at 0x7efbbd18e4b0>
[
  -46
]
>>> pa.array([Decimal('1234')], pa.int8(), safe=False)                                                                                                                      
Traceback (most recent call last):
  ...
ArrowInvalid: Value 1234 too large to fit in C integer type
{code}

I don't think this is very important: first because you can call cast() directly, second because the results are unusable anyway.




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