casey 8c224398bb IMPALA-2635: Kudu scanner hangs on UNION ...

A UNION is special because it may cause a scan node to be started
without any scan ranges. The Kudu scanner didn't expect that scenario
and would hang waiting for data from scanner threads that would never be
started. The fix is to exit early when there are no scan ranges.

Change-Id: Id53fb880ba23ee9bbcf3169598f97fa1a3285dd9
Reviewed-on: http://gerrit.sjc.cloudera.com:8080/10044
Reviewed-by: Casey Ching <casey@cloudera.com>
Tested-by: jenkins

2016-01-28 21:49:39 -08:00

2.2 KiB

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