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https://issues.apache.org/jira/browse/HIVE-13825?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15365396#comment-15365396
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Vihang Karajgaonkar commented on HIVE-13825:
--------------------------------------------
Initially when the root-cause was found it looked like a bug. But further
investigation revealed that the code is not designed to handle this particular
use-case. In order to enable this use-case more changes will be required since
this Map is being used at many other places. This issue should be regarded as a
feature or improvement instead.
> Using JOIN in 2 tables that has same path locations, but different colum
> names fail wtih an error exception
> -----------------------------------------------------------------------------------------------------------
>
> Key: HIVE-13825
> URL: https://issues.apache.org/jira/browse/HIVE-13825
> Project: Hive
> Issue Type: Bug
> Reporter: Sergio Peña
> Assignee: Vihang Karajgaonkar
>
> The following scenario of 2 tables with same locations cannot be used on a
> JOIN query:
> {noformat}
> hive> create table t1 (a string, b string) location
> '/user/hive/warehouse/test1';
> OK
> hive> create table t2 (c string, d string) location
> '/user/hive/warehouse/test1';
> OK
> hive> select t1.a from t1 join t2 on t1.a = t2.c;
> ...
> 2016-05-23 16:39:57 Starting to launch local task to process map join;
> maximum memory = 477102080
> Execution failed with exit status: 2
> Obtaining error information
> Task failed!
> Task ID:
> Stage-4
> Logs:
> FAILED: Execution Error, return code 2 from
> org.apache.hadoop.hive.ql.exec.mr.MapredLocalTask
> {noformat}
> The logs contain this error exception:
> {noformat}
> 2016-05-23T16:39:58,163 ERROR [main]: mr.MapredLocalTask (:()) - Hive Runtime
> Error: Map local work failed
> java.lang.RuntimeException: cannot find field a from [0:c, 1:d]
> at
> org.apache.hadoop.hive.serde2.objectinspector.ObjectInspectorUtils.getStandardStructFieldRef(ObjectInspectorUtils.java:485)
> at
> org.apache.hadoop.hive.serde2.BaseStructObjectInspector.getStructFieldRef(BaseStructObjectInspector.java:133)
> at
> org.apache.hadoop.hive.ql.exec.ExprNodeColumnEvaluator.initialize(ExprNodeColumnEvaluator.java:55)
> at
> org.apache.hadoop.hive.ql.exec.Operator.initEvaluators(Operator.java:973)
> at
> org.apache.hadoop.hive.ql.exec.Operator.initEvaluatorsAndReturnStruct(Operator.java:999)
> at
> org.apache.hadoop.hive.ql.exec.SelectOperator.initializeOp(SelectOperator.java:75)
> at
> org.apache.hadoop.hive.ql.exec.Operator.initialize(Operator.java:355)
> at
> org.apache.hadoop.hive.ql.exec.Operator.initialize(Operator.java:504)
> at
> org.apache.hadoop.hive.ql.exec.Operator.initializeChildren(Operator.java:457)
> at
> org.apache.hadoop.hive.ql.exec.Operator.initialize(Operator.java:365)
> at
> org.apache.hadoop.hive.ql.exec.Operator.initialize(Operator.java:504)
> at
> org.apache.hadoop.hive.ql.exec.Operator.initializeChildren(Operator.java:457)
> at
> org.apache.hadoop.hive.ql.exec.Operator.initialize(Operator.java:365)
> at
> org.apache.hadoop.hive.ql.exec.mr.MapredLocalTask.initializeOperators(MapredLocalTask.java:499)
> at
> org.apache.hadoop.hive.ql.exec.mr.MapredLocalTask.startForward(MapredLocalTask.java:403)
> at
> org.apache.hadoop.hive.ql.exec.mr.MapredLocalTask.executeInProcess(MapredLocalTask.java:383)
> at
> org.apache.hadoop.hive.ql.exec.mr.ExecDriver.main(ExecDriver.java:751)
> {noformat}
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