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https://issues.apache.org/jira/browse/DRILL-276?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Jacques Nadeau resolved DRILL-276.
----------------------------------
Resolution: Fixed
> aggregation over empty rowset will cause "Failure while running fragment. <
> NoSuchElementException"
> ---------------------------------------------------------------------------------------------------
>
> Key: DRILL-276
> URL: https://issues.apache.org/jira/browse/DRILL-276
> Project: Apache Drill
> Issue Type: Bug
> Reporter: Jinfeng Ni
> Assignee: Jinfeng Ni
> Priority: Minor
>
> For the following query, the WHERE clause will produce 0 rows. If we apply
> the count() function over the 0 result rows, drill will fail with error.
> SELECT count(*) FROM "nation.parquet" where 1=0;
> Here is the call stack when the NoSuchElementException is raised:
> Seems that the SortRecordBatchBuilder does not have the code to handle empty
> rowset yet, which leads to the error.
> java.util.NoSuchElementException
> java.util.HashMap$HashIterator.nextEntry(HashMap.java:929)
> ~[na:1.7.0_45]
> java.util.HashMap$EntryIterator.next(HashMap.java:966) ~[na:1.7.0_45]
> java.util.HashMap$EntryIterator.next(HashMap.java:964) ~[na:1.7.0_45]
>
> com.google.common.collect.AbstractMapBasedMultimap$KeySet$1.next(AbstractMapBasedMultimap.java:946)
> ~[guava-14.0.1.jar:na]
>
> org.apache.drill.exec.physical.impl.sort.SortRecordBatchBuilder.build(SortRecordBatchBuilder.java:94)
>
> ~[drill-java-exec-1.0.0-m2-incubating-SNAPSHOT-rebuffed.jar:1.0.0-m2-incubating-SNAPSHOT]
>
> org.apache.drill.exec.physical.impl.sort.SortBatch.next(SortBatch.java:138)
> ~[drill-java-exec-1.0.0-m2-incubating-SNAPSHOT-rebuffed.jar:1.0.0-m2-incubating-SNAPSHOT]
>
> org.apache.drill.exec.physical.impl.aggregate.AggBatch.next(AggBatch.java:85)
> ~[drill-java-exec-1.0.0-m2-incubating-SNAPSHOT-rebuffed.jar:1.0.0-m2-incubating-SNAPSHOT]
>
> org.apache.drill.exec.physical.impl.ScreenCreator$ScreenRoot.next(ScreenCreator.java:77)
>
> ~[drill-java-exec-1.0.0-m2-incubating-SNAPSHOT-rebuffed.jar:1.0.0-m2-incubating-SNAPSHOT]
> org.apache.drill.exec.work.FragmentRunner.run(FragmentRunner.java:79)
> ~[drill-java-exec-1.0.0-m2-incubating-SNAPSHOT-rebuffed.jar:1.0.0-m2-incubating-SNAPSHOT]
>
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
> [na:1.7.0_45]
>
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
> [na:1.7.0_45]
> java.lang.Thread.run(Thread.java:744) [na:1.7.0_45]
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