Although this thread is marked as answered, I thought it was appropriate to add an improvement on the solution that was mentioned in the thread.
Colleagues of mine hit this same problem. They solved it by processing the output of the RFC call, before passing it into the UDF which was intended to cache the data.
To accomplish this, they created a separate "fixing" UDF which was placed between the RFC and caching UDF. The sole action of this "fixing" is to read in a queue and write it directly out to the ResultList.
For whatever reason, this has the effect of presenting a queue to the caching UDF which the UDF is able to successfully process.
public void fixList(String[] input, ResultList result, Container container) throws StreamTransformationException {
for (int i = 0; i < input.length; i++) {
result.addValue(input<i>);
}
}
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