presto-main/src/main/java/io/prestosql/operator/scalar/JsonOperators.java/JsonOperators/notEqual
class JsonOperators:    @ScalarOperator(NOT_EQUAL)
    @SqlType(BOOLEAN)
    @SqlNullable
    public static Boolean notEqual(@SqlType(JSON) Slice leftJson, @SqlType(JSON) Slice rightJson)
    {
        return !leftJson.equals(rightJson);
    }