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https://issues.apache.org/jira/browse/HIVEMALL-157?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Makoto Yui closed HIVEMALL-157.
-------------------------------
Resolution: Fixed
Fix Version/s: 0.5.0
> Null Pointer Exception in to_ordered_list UDAF for empty (partial) result
> -------------------------------------------------------------------------
>
> Key: HIVEMALL-157
> URL: https://issues.apache.org/jira/browse/HIVEMALL-157
> Project: Hivemall
> Issue Type: Bug
> Reporter: Takuya Kitazawa
> Assignee: Takuya Kitazawa
> Fix For: 0.5.0
>
>
> Consider the following query:
> {code:sql}
> SELECT to_ordered_list(null, null)
> {code}
> Here, even though {{to_ordered_list()}} [automatically ignores NULL key
> and/or
> value|https://github.com/apache/incubator-hivemall/blob/c2b95783cf9d6fc1646a48ac928e96152eab98c6/core/src/main/java/hivemall/tools/list/UDAFToOrderedList.java#L283-L306],
> the query throws NPE because of [NULL queue handler access in
> {{drainQueue()}}|https://github.com/apache/incubator-hivemall/blob/c2b95783cf9d6fc1646a48ac928e96152eab98c6/core/src/main/java/hivemall/tools/list/UDAFToOrderedList.java#L409]:
> {code}
> org.apache.hadoop.hive.ql.metadata.HiveException:
> org.apache.hadoop.hive.ql.metadata.HiveException:
> java.lang.NullPointerException
> at
> org.apache.hadoop.hive.ql.exec.GroupByOperator.closeOp(GroupByOperator.java:1102)
> at org.apache.hadoop.hive.ql.exec.Operator.close(Operator.java:683)
> at org.apache.hadoop.hive.ql.exec.Operator.close(Operator.java:697)
> at org.apache.hadoop.hive.ql.exec.Operator.close(Operator.java:697)
> at org.apache.hadoop.hive.ql.exec.Operator.close(Operator.java:697)
> at
> org.apache.hadoop.hive.ql.exec.mr.ExecMapper.close(ExecMapper.java:189)
> at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:61)
> at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:453)
> at org.apache.hadoop.mapred.MapTask.run(MapTask.java:343)
> at
> org.apache.hadoop.mapred.LocalJobRunner$Job$MapTaskRunnable.run(LocalJobRunner.java:270)
> at
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
> at java.util.concurrent.FutureTask.run(FutureTask.java:266)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> at java.lang.Thread.run(Thread.java:745)
> Caused by: org.apache.hadoop.hive.ql.metadata.HiveException:
> java.lang.NullPointerException
> at
> org.apache.hadoop.hive.ql.exec.GroupByOperator.flush(GroupByOperator.java:1060)
> at
> org.apache.hadoop.hive.ql.exec.GroupByOperator.closeOp(GroupByOperator.java:1099)
> ... 14 more
> Caused by: java.lang.NullPointerException
> at
> hivemall.tools.list.UDAFToOrderedList$UDAFToOrderedListEvaluator$QueueAggregationBuffer.drainQueue(UDAFToOrderedList.java:411)
> at
> hivemall.tools.list.UDAFToOrderedList$UDAFToOrderedListEvaluator.terminatePartial(UDAFToOrderedList.java:313)
> at
> org.apache.hadoop.hive.ql.udf.generic.GenericUDAFEvaluator.evaluate(GenericUDAFEvaluator.java:204)
> at
> org.apache.hadoop.hive.ql.exec.GroupByOperator.forward(GroupByOperator.java:1020)
> at
> org.apache.hadoop.hive.ql.exec.GroupByOperator.flush(GroupByOperator.java:1043)
> ... 15 more
> {code}
> Since {{iterate()}} accepts NULL inputs, {{drainQueue()}} should not fail; it
> has to return something like empty list.
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