[jira] [Created] (HIVE-20331) Query with union all, lateral view and Join fails with "cannot find parent in the child operator"

[Aihua Xu (JIRA)]

Aihua Xu created HIVE-20331:
-------------------------------

             Summary: Query with union all, lateral view and Join fails with 
"cannot find parent in the child operator"
                 Key: HIVE-20331
                 URL: https://issues.apache.org/jira/browse/HIVE-20331
             Project: Hive
          Issue Type: Bug
          Components: Physical Optimizer
    Affects Versions: 2.1.1
            Reporter: Aihua Xu
            Assignee: Aihua Xu


The following query with Union, Lateral view and Join will fail during 
execution with the exception below.
{noformat}
create table t1(col1 int);
SELECT 1 AS `col1`
FROM t1
UNION ALL
  SELECT 2 AS `col1`
  FROM
    (SELECT col1
     FROM t1
    ) x1
    JOIN
      (SELECT col1
      FROM
        (SELECT 
          Row_Number() over (PARTITION BY col1 ORDER BY col1) AS `col1`
        FROM t1
        ) x2 lateral VIEW explode(map(10,1))`mapObj` AS `col2`, `col3`
      ) `expdObj`      
{noformat}

{noformat}
Caused by: org.apache.hadoop.hive.ql.metadata.HiveException: Hive internal 
error: cannot find parent in the child operator!
        at 
org.apache.hadoop.hive.ql.exec.Operator.initialize(Operator.java:362) 
~[hive-exec-4.0.0-SNAPSHOT.jar:4.0.0-SNAPSHOT]
        at 
org.apache.hadoop.hive.ql.exec.MapOperator.initializeMapOperator(MapOperator.java:509)
 ~[hive-exec-4.0.0-SNAPSHOT.jar:4.0.0-SNAPSHOT]
        at 
org.apache.hadoop.hive.ql.exec.mr.ExecMapper.configure(ExecMapper.java:116) 
~[hive-exec-4.0.0-SNAPSHOT.jar:4.0.0-SNAPSHOT]
{noformat}

After debugging, seems we have issues in GenMRFileSink1 class in which we are 
setting incorrect aliasToWork to the MapWork.




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