Will Jones created ARROW-17963:
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Summary: [C++] Implement cast_dictionary for string
Key: ARROW-17963
URL: https://issues.apache.org/jira/browse/ARROW-17963
Project: Apache Arrow
Issue Type: Improvement
Components: C++
Reporter: Will Jones
Fix For: 11.0.0
We can cast dictionary(string, X) to string, but not the other way around.
{code:R}
> Array$create(c("a", "b"))$cast(dictionary(int32(), string()))
Error: NotImplemented: Unsupported cast from string to dictionary using
function cast_dictionary
/Users/willjones/Documents/arrows/arrow/cpp/src/arrow/compute/function.cc:249
func.DispatchBest(&in_types)
> Array$create(as.factor(c("a", "b")))$cast(string())
Array
<string>
[
"a",
"b"
]
{code}
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