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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