If the merged row is yielded and the caller immediately asks for another row, the enumerator is never advanced. Don't yield until the enumerator has been advanced.
If the merged row is yielded and the caller immediately asks for another
row, the enumerator is never advanced. Don't yield until the enumerator
has been advanced.

hibernating-rhinos/rhino-etl,regisbsb/rhino-etl,ggeurts/rhino-etl,teodimache/rhino-etl,koulkov/rhino-etl,IntelliTect/rhino-etl,ayende/rhino-etl,vebin/rhino-etl,pushrbx/rhino-etl,RudyCo/rhino-etl