java.lang.NullPointerException: This exception has no message.

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via Google Groups by Maurizio Gallelli, 1 year ago
This exception has no message.
via Google Groups by Hailei Zhang, 4 months ago
java.lang.NullPointerException:
at io.druid.query.aggregation.LongSumAggregator.combineValues(LongSumAggregator.java:39)
at io.druid.query.aggregation.LongSumAggregatorFactory.combine(LongSumAggregatorFactory.java:78)
at io.druid.segment.IndexMerger$RowboatMergeFunction.apply(IndexMerger.java:1242)
at io.druid.collections.CombiningIterator.next(CombiningIterator.java:78)
at io.druid.segment.IndexMerger.makeIndexFiles(IndexMerger.java:730)
at io.druid.segment.IndexMerger.merge(IndexMerger.java:336)
at io.druid.segment.IndexMerger.mergeQueryableIndex(IndexMerger.java:218)
at io.druid.common.guava.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:40)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)

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