I want to cast pyarrow table column from decimal(38,4) to int64.

col.cast(pa.int64())

Error:
  File "pyarrow/table.pxi", line 443, in pyarrow.lib.Column.cast
  File "pyarrow/error.pxi", line 89, in pyarrow.lib.check_status
pyarrow.lib.ArrowNotImplementedError: No cast implemented from decimal(38, 4) 
to int64

Python version : 3.6.5
Pyarrow version : 0.10.0

is it not implemented yet or I am not using it correctly? If not implemented 
yet, then any work around to cast columns?

[ Full content available at: https://github.com/apache/arrow/issues/2627 ]
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