Paging Problem with Querying Directories

Problem comes with the following Drill query:
"SELECT * FROM <<mySource>>
WHERE (dir0='Test1' AND dir1='TestDataSourceID1')
OR (dir0='Test2' AND dir1='TestDataSourceID2')
LIMIT 2 OFFSET 0"

If this call gets run twice it is randomly set which file will be in the result. So if a query is created which should page my result I won't be able to tell which source was used for the result.
Due two the fact that if file1 contains the columns a, b, c and column b, c, d I also will get a problem with the result as the first results will for example contain the columns a, b, c and the second half of the results will contain a, b, c, d with a filled with null.

As in the example on your webpage (https://drill.apache.org/docs/querying-directories/) where you query specific columns and order the result without any paging I am wondering if this problem only occurs while using the star in the query.