Github user kaspersorensen commented on the issue:
https://github.com/apache/metamodel/pull/139
Yes that sounds correct to me. I think this is much more manageable for
existing implementations which typically do something like this:
```
if (operator == EQUALS_TO) {
return somethingUsefull();
} else if (operator == LIKE) {
return somethingElseUsefull();
} else {
// this is not supported - return null to make MetaModel evaluate the
filter item on the client side.
return null;
}
```
(the above snippet would still be valid even though other operators are
added. If we added the negation option, it would not).
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