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https://issues.apache.org/jira/browse/HIVE-1553?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12899855#action_12899855
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Wojciech Langiewicz commented on HIVE-1553:
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It also happens on columns that are not allowed to be NULL (and are not), so
https://issues.apache.org/jira/browse/HIVE-1011 probably won't fix this.
> NPE when using complex string UDF
> ---------------------------------
>
> Key: HIVE-1553
> URL: https://issues.apache.org/jira/browse/HIVE-1553
> Project: Hadoop Hive
> Issue Type: Bug
> Components: UDF
> Affects Versions: 0.5.0
> Environment: CDH3B2 version on debian
> Reporter: Wojciech Langiewicz
>
> When executing this query: {code}select explode(split(city, "")) as char from
> users;{code} I get NPE: {code}java.lang.NullPointerException
> at
> org.apache.hadoop.hive.ql.udf.generic.GenericUDTFExplode.process(GenericUDTFExplode.java:70)
> at
> org.apache.hadoop.hive.ql.exec.UDTFOperator.processOp(UDTFOperator.java:98)
> at org.apache.hadoop.hive.ql.exec.Operator.process(Operator.java:386)
> at org.apache.hadoop.hive.ql.exec.Operator.forward(Operator.java:598)
> at
> org.apache.hadoop.hive.ql.exec.SelectOperator.processOp(SelectOperator.java:81)
> at org.apache.hadoop.hive.ql.exec.Operator.process(Operator.java:386)
> at org.apache.hadoop.hive.ql.exec.Operator.forward(Operator.java:598)
> at
> org.apache.hadoop.hive.ql.exec.TableScanOperator.processOp(TableScanOperator.java:43)
> at org.apache.hadoop.hive.ql.exec.Operator.process(Operator.java:386)
> at org.apache.hadoop.hive.ql.exec.Operator.forward(Operator.java:598)
> at
> org.apache.hadoop.hive.ql.exec.MapOperator.process(MapOperator.java:347)
> at org.apache.hadoop.hive.ql.exec.ExecMapper.map(ExecMapper.java:171)
> at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:50)
> at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:358)
> at org.apache.hadoop.mapred.MapTask.run(MapTask.java:307)
> at org.apache.hadoop.mapred.Child.main(Child.java:170){code}
> But in case of this query:{code}select explode(split(city, "")) as char from
> users where id = 234234;{code} NPE does not occur, but in case of this query:
> {code}select explode(split(city, "")) as char from users where id > 0;{code}
> Some mappers succed, but most of them fails, so whole task fails.
> city is a string column and maximum users.id is about 30M.
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