ExprNullValue extends AbstractExprValue { @Override public ExprType type() { return ExprCoreType.UNKNOWN; } 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 getType() { assertEquals(ExprCoreType.UNKNOWN, LITERAL_NULL.type()); }