[bugfix] fix parse batch empty MapArray error in NegativeSampler

[tiankongdeguiji]

[rank0]: File "/opt/conda/lib/python3.11/site-packages/tzrec/datasets/sampler.py", line 157, in _to_arrow_array
[rank0]: keys = kv_list.take(list(range(0, len(kv_list), 2))).cast(
[rank0]: ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[rank0]: File "pyarrow/array.pxi", line 1472, in pyarrow.lib.Array.take
[rank0]: File "/opt/conda/lib/python3.11/site-packages/pyarrow/compute.py", line 487, in take
[rank0]: return call_function('take', [data, indices], options, memory_pool)
[rank0]: ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[rank0]: File "pyarrow/_compute.pyx", line 590, in pyarrow._compute.call_function
[rank0]: File "pyarrow/_compute.pyx", line 385, in pyarrow._compute.Function.call
[rank0]: File "pyarrow/error.pxi", line 155, in pyarrow.lib.pyarrow_internal_check_status
[rank0]: File "pyarrow/error.pxi", line 92, in pyarrow.lib.check_status
[rank0]: pyarrow.lib.ArrowNotImplementedError: Function 'array_take' has no kernel matching input types (string, null)

[chengaofei]

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