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Posted to dev@hive.apache.org by "David Morel (JIRA)" <ji...@apache.org> on 2013/01/07 18:18:12 UTC
[jira] [Created] (HIVE-3869) SELECT foo, NULL UNION ALL SELECT bar,
baz fails
David Morel created HIVE-3869:
---------------------------------
Summary: SELECT foo, NULL UNION ALL SELECT bar, baz fails
Key: HIVE-3869
URL: https://issues.apache.org/jira/browse/HIVE-3869
Project: Hive
Issue Type: Bug
Affects Versions: 0.8.1
Reporter: David Morel
In order to avoid the curse of the last reducer by using a left outer join where most joined rows woudl be NULLs, I rewrote the query as:
{code}
SELECT * FROM (
SELECT
A.user_id id,
B.created
FROM (
SELECT DISTINCT user_id
FROM users
) A
JOIN
buyhist B
ON
A.user_id = B.user_id
AND B.created >= '2013-01-01'
UNION ALL
SELECT
DISTINCT(user_id) id,
NULL created
FROM users
) foo;
{code}
The expection thrown is this:
{code}
2013-01-07 17:00:01,081 WARN org.apache.hadoop.mapred.Child: Error running child
java.lang.RuntimeException: Error in configuring object
at org.apache.hadoop.util.ReflectionUtils.setJobConf(ReflectionUtils.java:106)
at org.apache.hadoop.util.ReflectionUtils.setConf(ReflectionUtils.java:72)
at org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:130)
at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:389)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:327)
at org.apache.hadoop.mapred.Child$4.run(Child.java:270)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:396)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1232)
at org.apache.hadoop.mapred.Child.main(Child.java:264)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.hadoop.util.ReflectionUtils.setJobConf(ReflectionUtils.java:103)
... 9 more
Caused by: java.lang.RuntimeException: Error in configuring object
at org.apache.hadoop.util.ReflectionUtils.setJobConf(ReflectionUtils.java:106)
at org.apache.hadoop.util.ReflectionUtils.setConf(ReflectionUtils.java:72)
at org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:130)
at org.apache.hadoop.mapred.MapRunner.configure(MapRunner.java:34)
... 14 more
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.hadoop.util.ReflectionUtils.setJobConf(ReflectionUtils.java:103)
... 17 more
Caused by: java.lang.RuntimeException: Map operator initialization failed
at org.apache.hadoop.hive.ql.exec.ExecMapper.configure(ExecMapper.java:121)
... 22 more
Caused by: java.lang.NullPointerException
at org.apache.hadoop.hive.serde2.objectinspector.StructObjectInspector.toString(StructObjectInspector.java:60)
at java.lang.String.valueOf(String.java:2826)
at java.lang.StringBuilder.append(StringBuilder.java:115)
at org.apache.hadoop.hive.ql.exec.UnionOperator.initializeOp(UnionOperator.java:110)
at org.apache.hadoop.hive.ql.exec.Operator.initialize(Operator.java:357)
at org.apache.hadoop.hive.ql.exec.MapOperator.initializeOp(MapOperator.java:427)
at org.apache.hadoop.hive.ql.exec.Operator.initialize(Operator.java:357)
at org.apache.hadoop.hive.ql.exec.ExecMapper.configure(ExecMapper.java:98)
... 22 more
{code}
The "org.apache.hadoop.hive.serde2.objectinspector.StructObjectInspector.toString(StructObjectInspector.java:60)" caught my attention, so I replaced NULL by an empty string:
{code}
...
UNION ALL
SELECT
DISTINCT(user_id) id,
'' created
{code}
Shouldn't the query parser accept the form using NULL, or at least output a message before the job is sent to the jobtracker?
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