ExprNullValue extends AbstractExprValue { @Override public boolean isNull() { return true; } private  ExprNullValue(); @Override int hashCode(); @Override String toString(); static ExprNullValue of(); @Override Object value(); @Override ExprType type(); @Override boolean isNull(); @Override int compare(ExprValue other); @Override boolean equal(ExprValue other);  }
@Test public void test_is_null() { assertTrue(LITERAL_NULL.isNull()); }