Github user hbdeshmukh commented on the issue:
https://github.com/apache/incubator-quickstep/pull/14
> @hbdeshmukh Have you try to use std::vector<const QueryHandle*> instead
of std::vector<QueryHandle*>?
Using ``const QueryHandle*`` doesn't work because we extract the DAG from
it. On the DAG pointer, we call ``getNodePayloadMutable()`` to fetch a pointer
to the ``RelationalOperator``. The function ``getAllWorkOrders`` changes the
state of the DAG. Due to this chain, we can't use ``const QueryHandle*``.
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