edponce commented on a change in pull request #10721:
URL: https://github.com/apache/arrow/pull/10721#discussion_r672448128
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File path: cpp/src/arrow/compute/kernels/scalar_cast_test.cc
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@@ -1930,29 +1930,23 @@ TEST(Cast, DictTypeToAnotherDict) {
check_cast(dictionary(int32(), utf8()), dictionary(int8(), utf8()),
R"(["a", "b", "a", null])");
+ // check float types (NOTE: ArrayFromJSON doesnt work for float value
dictionary types)
Review comment:
The error is from `ArrayFromJSON(dictionary(..., floatXX()), ...)` is:
```
NotImplemented: JSON conversion to dictionary<values=float, indices=int8,
ordered=0> not implemented
```
Nevertheless, you can `Cast` successfully to `float` values with
```
auto arr = ArrayFromJSON(dictionary(int8(), int32()), "[1, 2, 3, 1, null,
3]");
ASSERT_OK_AND_ASSIGN(auto casted, Cast(arr, dictionary(int8(), float32()),
CastOptions::Safe()));
```
There is also a `DictArrayFromJSON` but this requires explicit index values:
```
auto arr = DictArrayFromJSON(dictionary(int8(), float32()), "[0, 1, 2, 3, 4,
5]", "[1, 2, 3, 1, null, 3]");
```
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