@Override
    public TensorType type(TypeContext<Reference> context) {
        TensorType inputType = input.type(context);
        var meta = analyze(inputType);
        return meta.outputType();
    }
Macro that expands to the appropriate map_subspaces magic incantation

@author arnej
searchlib/src/main/java/com/yahoo/searchlib/rankingexpression/rule/UnpackBitsNode.java