Join queries hang without returning results

Queries involving joins may hang unexpectedly and never return results. This query in particular, generated by the Linq2Couchbase integration tests, seems to work often:

SELECT `Extent2`.`airportname` as `airportName`, `Extent1`.`airline` as `airline`

FROM `travel-sample` as `Extent1`

INNER JOIN `travel-sample` as `Extent2` ON (`Extent1`.`destinationairport` = `Extent2`.`faa`) 

WHERE ((`Extent1`.`type` = 'route') AND (`Extent2`.`type` = 'airport')) 

LIMIT 1

I have replicated repeatedly from the .NET SDK, using cURL, and in the Query Workbench. The HTTP request appears to get hung and never return a value and, in the case of cURL, never timeout. However, sometimes (rarely) valid results are returned.