[jira] [Updated] (ARROW-18257) [Python] array of time64 type changes from Time64Type to DataType

["&res (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-18257?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

&res updated ARROW-18257:
-------------------------
    Component/s: Python

> [Python] array of time64 type changes from Time64Type to DataType
> -----------------------------------------------------------------
>
>                 Key: ARROW-18257
>                 URL: https://issues.apache.org/jira/browse/ARROW-18257
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: Python
>    Affects Versions: 10.0.0
>         Environment: python 3.9
> pyarrow 10.0.0
> No pandas installed
>            Reporter: &res
>            Priority: Minor
>
> When creating an array of time64 elements, the array type information is changed from Time64Type to DataType. 
> While it's not an issue as such, given it still looks like an array of time64, I can't access special attributes of the Time64Type (for example unit)
>  
> {code:java}
> dtype = pa.time64("ns")
> time_array = pa.array(
>     [
>         1,
>         2,
>         3
>     ],
>     dtype
> )
> assert pa.types.is_time64(time_array.type) is True
> assert isinstance(dtype, pa.Time64Type) is True
> assert isinstance(time_array.type, pa.Time64Type) is False # Wrong
> assert isinstance(time_array.type, pa.DataType) is True # Wrong
> assert dtype == time_array.type
> assert dtype.unit == "ns"
> with pytest.raises(AttributeError, match=r"'pyarrow.lib.DataType' object has no attribute 'unit'"):
>     # Should be able to access unit:
>     time_array.type.unit{code}



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