Antoine Pitrou created ARROW-4563:
-------------------------------------

             Summary: [Python] pa.decimal128 should validate inputs
                 Key: ARROW-4563
                 URL: https://issues.apache.org/jira/browse/ARROW-4563
             Project: Apache Arrow
          Issue Type: Bug
          Components: Python
    Affects Versions: 0.12.0
            Reporter: Antoine Pitrou


The precision shouldn't be higher than 38, but 39 is happily accepted currently:
{code:python}
>>> ty = pa.decimal128(39, 0)                                                   
>>>                          
>>> arr = pa.array([2**127], type=ty)                                           
>>>                        
>>> arr                                                                         
>>>                          
<pyarrow.lib.Decimal128Array object at 0x7f9b89444138>
[
  -170141183460469231731687303715884105728
]
{code}





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