[jira] [Created] (HIVE-15235) sortmergejoin can produce incorrect plan wrt dummy operators

["Sergey Shelukhin (JIRA)" <ji...@apache.org>]

Sergey Shelukhin created HIVE-15235:
---------------------------------------

             Summary: sortmergejoin can produce incorrect plan wrt dummy operators
                 Key: HIVE-15235
                 URL: https://issues.apache.org/jira/browse/HIVE-15235
             Project: Hive
          Issue Type: Bug
            Reporter: Sergey Shelukhin


{noformat}
<MERGEJOIN>Id =13
                  <Children>
                    <SEL>Id =12
                      <Children>
                        <MAPJOIN>Id =10
                          <Children>
                            <FS>Id =11
                              <Children>
                              <\Children>
                              <Parent>Id = 10 null<\Parent>
                            <\FS>
                          <\Children>
                          <Parent>Id = 12 nullId = 9 
                        <HASHTABLEDUMMY>Id =9
                          <Children>null
                          <\Children>
                          <Parent><\Parent>
                        <\HASHTABLEDUMMY><\Parent>
                        <\MAPJOIN>
                      <\Children>
                      <Parent>Id = 13 null<\Parent>
                    <\SEL>
                  <\Children>
{noformat}

This only happens when sortmergejoin is enabled.
This is on reduce size of a Tez job; during initialization, dummy operators are not initialized (presumably, they are not present in the work); that results in MapJoin not being initialized, even though its proper parent is.
Manifests as an NPE 
{noformat}
Caused by: java.lang.NullPointerException
at org.apache.hadoop.hive.ql.exec.MapJoinOperator.process(MapJoinOperator.java:350)
{noformat}



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