How to combine the results of two HQL queries into one

I have two HQL queries that I need to combine into a single set of results.

Both ObjectOne and ObjectTwo are derived from the same base class. ObjectOne has

The first query is...

SELECT
    //Some things
FROM

ObjectOne objectOne,
ObjectTwo objectTwo

WHERE
objectOne in elements(objectTwo.components)
And the second query is...

SELECT
    //Some things
FROM

ObjectOne objectOne
LEFT OUTER JOIN objectOne.parentObject parentObj
WHERE parentObj.myField is null


Thanks in advance!