[GitHub] [arrow] westonpace commented on issue #34588: [C++][Python] Add compute kernel for "dictionary_decode"

["westonpace (via GitHub)" <gi...@apache.org>]

westonpace commented on issue #34588:
URL: https://github.com/apache/arrow/issues/34588#issuecomment-1504276524

   > Hi, where is the code of dictionary_encode in cpp?
   
   This can be done today with the cast function (and I'm pretty sure that is how its done when we need to decode in Acero):
   
   >>> x = pa.array(["a", "a", "b"], pa.dictionary(pa.int8(), pa.string()))
   >>> x
   <pyarrow.lib.DictionaryArray object at 0x7f9eaaf60900>
   
   -- dictionary:
     [
       "a",
       "b"
     ]
   -- indices:
     [
       0,
       0,
       1
     ]
   >>> pc.cast(x, pa.string())
   <pyarrow.lib.StringArray object at 0x7f9eaaf80b20>
   [
     "a",
     "a",
     "b"
   ]
   
   I agree that an explicit `dictionary_decode` alias would be nice.  Maybe we can use a MetaFunction?


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