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Race condition in multi channel lookupjoin could cause hangup

Description

A lookup join in multichannel setup could deadlock if all channels apart from 0 finished very quickly (probably required all to have 0 rows).

Similarly, if lookup join channels started broadcasting very quickly, before channel 0 had started, an assert could be hit.

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Created May 23, 2016 at 10:35 AM
Updated May 23, 2016 at 2:15 PM
Resolved May 23, 2016 at 2:15 PM