I'm using the following code to get distinct values of a specific type asynchronously:

collection.distinct("fieldName", SomeType.class).batchCursor(…)

The problem is that even though the result is declared as AsyncBatchCursor<SomeType> the actual values are of type String because the respective codec was never applied.

After debugging a lot I've figured out that DistinctOperation.asyncTransformer() doesn't use the supplied decoder at all.