Fix time type _arrow_to_datasets_dtype conversion
#4628
Merged
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Fix #4620
The issue stems from the fact that
pa.array([time_data]).typereturnsDataType(time64[unit]), which doesn't expose theunitattribute, instead ofTime64Type(time64[unit]). I believe this is a bug in PyArrow. Luckily, the both types have the samestr(), so in this PR I callpa.type_for_alias(str(type))to convert them both to theTime64Type(time64[unit])format.cc @severo