apache / apache/beam

stats.ApproximateUniqueCombineFn should handle numpy array

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bug core P3 python
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Description

stats.ApproximateUniqueCombineFn uses DeterministicFastPrimitivesCoder to encode input data. DeterministicFastPrimitivesCoder only accepts python data types and iterables, so numpy data types throw an error. 

Edit: for more detail, with numpy data, the coder registry assigns PickleCoder which returns DeterministicFastPrimitivesCoder when calling PickleCoder.as_deterministic_coder

Imported from Jira [BEAM-10900](https://issues.apache.org/jira/browse/BEAM-10900). Original Jira may contain additional context.
Reported by: monicadsong.

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