Yibing Shi created HIVE-11216:
---------------------------------
Summary: 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
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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