public Tensor getTensor(String featureName) {
        if (values == null)
            values = new LinkedHashMap<>();

        Tensor value = values.get(featureName);
        if (value != null) return value;

        if (encodedValues != null)
            value = decodeTensor(featureName);
        if (value != null)
            values.put(featureName, value);
        return value;
    }
Returns the value of a tensor feature, or null if it is not present.
This will return any feature value: Scalars are returned as a rank 0 tensor.
container-search/src/main/java/com/yahoo/search/result/FeatureData.java