@SuppressWarnings({ "unchecked", "rawtypes" })
    public static boolean isSet(TBase<?, ?> struct, TFieldIdEnum field) {
        return ((TBase) struct).isSet(field);
    }
Tells whether the specified struct field is set or not.
thrift/thrift0.13/src/main/java/com/linecorp/armeria/internal/common/thrift/ThriftFieldAccess.java