ExprMissingValue extends AbstractExprValue { @Override public String toString() { return "MISSING"; } private  ExprMissingValue(); static ExprMissingValue of(); @Override Object value(); @Override ExprType type(); @Override boolean isMissing(); @Override int compare(ExprValue other); @Override boolean equal(ExprValue other); @Override int hashCode(); @Override String toString();  }
@Test public void toStringTest() { assertEquals("MISSING", LITERAL_MISSING.toString()); }