@Override
    public PrimitiveTensorFunction<NAMETYPE> toPrimitive() {
        return new CellCast<>(argument.toPrimitive(), valueType);
    }
The <i>cell_cast</i> tensor function creates a new tensor with the specified cell value type.

@author lesters
vespajlib/src/main/java/com/yahoo/tensor/functions/CellCast.java