[jira] [Created] (ARROW-6506) [C++] Validation of ExtensionType with nested type fails

["Joris Van den Bossche (Jira)" <ji...@apache.org>]

Joris Van den Bossche created ARROW-6506:
--------------------------------------------

             Summary: [C++] Validation of ExtensionType with nested type fails
                 Key: ARROW-6506
                 URL: https://issues.apache.org/jira/browse/ARROW-6506
             Project: Apache Arrow
          Issue Type: Bug
          Components: C++
            Reporter: Joris Van den Bossche
             Fix For: 0.15.0


A reproducer using the Python ExtensionType:

{code}
class MyStructType(pa.ExtensionType): 

    def __init__(self): 
        storage_type = pa.struct([('a', pa.int64()), ('b', pa.int64())]) 
        pa.ExtensionType.__init__(self, storage_type, 'my_struct_type') 

    def __arrow_ext_serialize__(self): 
        return b'' 

    @classmethod 
    def __arrow_ext_deserialize__(self, storage_type, serialized): 
        return MyStructType() 

ty = MyStructType()
storage_array = pa.array([{'a': 1, 'b': 2}], ty.storage_type) 
arr = pa.ExtensionArray.from_storage(ty, storage_array) 
{code}

then validating this array fails because it expects no children (the extension array itself has no children, only the storage array):

{code}
In [8]: arr.validate()   
---------------------------------------------------------------------------
ArrowInvalid                              Traceback (most recent call last)
<ipython-input-8-13783ce9f25e> in <module>
----> 1 arr.validate()

~/scipy/repos/arrow/python/pyarrow/array.pxi in pyarrow.lib.Array.validate()

~/scipy/repos/arrow/python/pyarrow/error.pxi in pyarrow.lib.check_status()

ArrowInvalid: Expected 0 child arrays in array of type extension<my_struct_type>, got 2
{code}




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