BUG: Cannot create third-party ExtensionArrays for datetime types (original) (raw)
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Code Sample: #34987
Problem description
With #33400 type checks now fasttrack on the kind of the dtype. Thus for every ExtensionDtype that is of kind M, is_datetime64tz_dtype returns True. This is then used in get_block_type which leads to the usage of DatetimeTZBlock for all of these arrays although this block only supports DatetimeArray.
| elif is_datetime64tz_dtype(values.dtype): |
|---|
| cls = DatetimeTZBlock |
| elif is_interval_dtype(dtype) or is_period_dtype(dtype): |
| cls = ObjectValuesExtensionBlock |
| elif is_extension_array_dtype(values.dtype): |
| cls = ExtensionBlock |