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https://issues.apache.org/jira/browse/HIVE-11216?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yibing Shi updated HIVE-11216:
------------------------------
Attachment: HIVE-11216.1.patch
Attach a new patch.
> UDF GenericUDFMapKeys throws NPE when a null map value is passed in
> -------------------------------------------------------------------
>
> Key: HIVE-11216
> URL: https://issues.apache.org/jira/browse/HIVE-11216
> Project: Hive
> Issue Type: Bug
> Components: UDF
> Affects Versions: 1.2.0
> Reporter: Yibing Shi
> Assignee: Yibing Shi
> Attachments: HIVE-11216.1.patch, HIVE-11216.patch
>
>
> We can reproduce the problem as below:
> {noformat}
> hive> show create table map_txt;
> OK
> CREATE TABLE `map_txt`(
> `id` int,
> `content` map<int,string>)
> ROW FORMAT SERDE
> 'org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe'
> STORED AS INPUTFORMAT
> 'org.apache.hadoop.mapred.TextInputFormat'
> OUTPUTFORMAT
> 'org.apache.hadoop.hive.ql.io.HiveIgnoreKeyTextOutputFormat'
> ...
> Time taken: 0.233 seconds, Fetched: 18 row(s)
> hive> select * from map_txt;
> OK
> 1 NULL
> Time taken: 0.679 seconds, Fetched: 1 row(s)
> hive> select id, map_keys(content) from map_txt;
> ....
> Error during job, obtaining debugging information...
> Examining task ID: task_1435534231122_0025_m_000000 (and more) from job
> job_1435534231122_0025
> Task with the most failures(4):
> -----
> Task ID:
> task_1435534231122_0025_m_000000
> URL:
>
> http://host-10-17-80-40.coe.cloudera.com:8088/taskdetails.jsp?jobid=job_1435534231122_0025&tipid=task_1435534231122_0025_m_000000
> -----
> Diagnostic Messages for this Task:
> Error: java.lang.RuntimeException:
> org.apache.hadoop.hive.ql.metadata.HiveException: Hive Runtime Error while
> processing row {"id":1,"content":null}
> at
> org.apache.hadoop.hive.ql.exec.mr.ExecMapper.map(ExecMapper.java:198)
> at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:54)
> at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:450)
> at org.apache.hadoop.mapred.MapTask.run(MapTask.java:343)
> at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:168)
> at java.security.AccessController.doPrivileged(Native Method)
> at javax.security.auth.Subject.doAs(Subject.java:422)
> at
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1642)
> at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:163)
> Caused by: org.apache.hadoop.hive.ql.metadata.HiveException: Hive Runtime
> Error while processing row {"id":1,"content":null}
> at
> org.apache.hadoop.hive.ql.exec.MapOperator.process(MapOperator.java:559)
> at
> org.apache.hadoop.hive.ql.exec.mr.ExecMapper.map(ExecMapper.java:180)
> ... 8 more
> Caused by: org.apache.hadoop.hive.ql.metadata.HiveException: Error evaluating
> map_keys(content)
> at
> org.apache.hadoop.hive.ql.exec.SelectOperator.processOp(SelectOperator.java:84)
> at org.apache.hadoop.hive.ql.exec.Operator.forward(Operator.java:796)
> at
> org.apache.hadoop.hive.ql.exec.TableScanOperator.processOp(TableScanOperator.java:92)
> at org.apache.hadoop.hive.ql.exec.Operator.forward(Operator.java:796)
> at
> org.apache.hadoop.hive.ql.exec.MapOperator.process(MapOperator.java:549)
> ... 9 more
> Caused by: java.lang.NullPointerException
> at
> org.apache.hadoop.hive.ql.udf.generic.GenericUDFMapKeys.evaluate(GenericUDFMapKeys.java:64)
> at
> org.apache.hadoop.hive.ql.exec.ExprNodeGenericFuncEvaluator._evaluate(ExprNodeGenericFuncEvaluator.java:166)
> at
> org.apache.hadoop.hive.ql.exec.ExprNodeEvaluator.evaluate(ExprNodeEvaluator.java:77)
> at
> org.apache.hadoop.hive.ql.exec.ExprNodeEvaluator.evaluate(ExprNodeEvaluator.java:65)
> at
> org.apache.hadoop.hive.ql.exec.SelectOperator.processOp(SelectOperator.java:79)
> ... 13 more
> FAILED: Execution Error, return code 2 from
> org.apache.hadoop.hive.ql.exec.mr.MapRedTask
> MapReduce Jobs Launched:
> Stage-Stage-1: Map: 1 HDFS Read: 0 HDFS Write: 0 FAIL
> hive>
> {noformat}
> The error is as below (in mappers):
> {noformat}
> Caused by: java.lang.NullPointerException
> at
> org.apache.hadoop.hive.ql.udf.generic.GenericUDFMapKeys.evaluate(GenericUDFMapKeys.java:64)
> at
> org.apache.hadoop.hive.ql.exec.ExprNodeGenericFuncEvaluator._evaluate(ExprNodeGenericFuncEvaluator.java:166)
> at
> org.apache.hadoop.hive.ql.exec.ExprNodeEvaluator.evaluate(ExprNodeEvaluator.java:77)
> at
> org.apache.hadoop.hive.ql.exec.ExprNodeEvaluator.evaluate(ExprNodeEvaluator.java:65)
> at
> org.apache.hadoop.hive.ql.exec.KeyWrapperFactory$ListKeyWrapper.getNewKey(KeyWrapperFactory.java:113)
> at
> org.apache.hadoop.hive.ql.exec.GroupByOperator.processOp(GroupByOperator.java:778)
> ... 17 more
> {noformat}
> Looking at the source code:
> {code}
> public Object evaluate(DeferredObject[] arguments) throws HiveException {
> retArray.clear();
> Object mapObj = arguments[0].get();
> retArray.addAll(mapOI.getMap(mapObj).keySet());
> return retArray;
> }
> {code}
> It is obvious that we will have a NPE when a NULL map value is passed in
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