[GitHub] [arrow] randolf-scholz commented on pull request #35210: GH-35209: [Python] Add a type alias for pa.dictionary(pa.int32(), pa.string())

["randolf-scholz (via GitHub)" <gi...@apache.org>]

randolf-scholz commented on PR #35210:
URL: https://github.com/apache/arrow/pull/35210#issuecomment-1546589412

   @danepitkin I'd add `dictionary[string,int32]` since it is likely the most common one. Maybe one should add `dictionary[int8,string]`, `dictionary[int16,string]` and `dictionary[int64,string]` immediately as well? How common are non-string dictionaries anyway?
   
   If all possible combinations with non-string types are needed one could write a custom lookup instead. 
   
   Regarding the representation one could do either:
   
   - differentiate `DictionaryType.__repr__` and `DictionaryType.__str__`, so that the latter returns the type-code
   - add an additional `name` / `type_code` property to each dtype that returns the abbreviated type code
       - for example, numpy has `name` attribute
       - `np.dtype("int32").name` ⇝ "int32"
       - `np.dtype("datetime64[ns]").name` ⇝ "datetime64[ns]"
   


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