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Convert a primitive pyarrow.Array to a numpy array and boolean mask based
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on the buffers of the Array.
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At the moment pyarrow.BooleanArray is not supported.
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Parameters
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----------
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arr : pyarrow.Array
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dtype : numpy.dtype
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Returns
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-------
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(data, mask)
|
Tuple of two numpy arrays with the raw data (with specified dtype) and
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a boolean mask (validity mask, so False means missing)
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