void (_Fields field, @org.apache.thrift.annotation.Nullable java.lang.Object value) { switch (field) { case EXPRESSION: if (value == null) { unsetExpression(); } else { setExpression((java.lang.String)value); } break; case DO_TRUNC: if (value == null) { unsetDoTrunc(); } else { setDoTrunc((java.lang.Boolean)value); } break; } }