Github user zuyu commented on the issue:
https://github.com/apache/incubator-quickstep/pull/234
@Terranlee Unfortunately, I observed some non-deterministic results for the
following two queries in
`quickstep_queryoptimizer_tests_executiongenerator_select_distributed`.
So I suggest to create a new test for `union` in the single-node mode only.
```
SELECT int_col AS result FROM test
WHERE int_col < 5
UNION
SELECT int_col + 3 AS result FROM test
WHERE int_col < 5;
SELECT float_col FROM test
WHERE int_col < 5
ORDER BY int_col DESC
LIMIT 5
UNION ALL
SELECT float_col FROM test
WHERE int_col < 5
ORDER BY int_col DESC
LIMIT 10
```
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