[jira] [Work started] (HIVE-21660) Wrong result when union all and later view with explode is used

["Navya Sruthi Sunkarapalli (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-21660?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Work on HIVE-21660 started by Navya Sruthi Sunkarapalli.
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> Wrong result when union all and later view with explode is used
> ---------------------------------------------------------------
>
>                 Key: HIVE-21660
>                 URL: https://issues.apache.org/jira/browse/HIVE-21660
>             Project: Hive
>          Issue Type: Bug
>    Affects Versions: 3.1.1
>            Reporter: Ganesha Shreedhara
>            Assignee: Navya Sruthi Sunkarapalli
>            Priority: Major
>
> There is a data loss when the data is inserted to a partitioned table using union all and lateral view with explode. 
>  
> *Steps to reproduce:*
>  
> {code:java}
> create table t1 (id int, dt string);
> insert into t1 values (2, '2019-04-01');
> create table t3( id int, dates array<string>);
> insert into t2 select 1 as id, array('2019-01-01','2019-01-02','2019-01-03') as dates;
> create table dst (id int) partitioned by (dt string);
> set hive.exec.dynamic.partition.mode=nonstrict;
> set hive.exec.dynamic.partition=true;
> insert overwrite table dst partition (dt)
> select t.id, t.dt from (
> select id, dt from t1
> union all
> select id, dts as dt from t2 tt2 lateral view explode(tt2.dates) dd as dts ) t;
> select * from dst_hdfs;
> {code}
>  
>  
> *Actual Result:*
> {code:java}
> +--------------+--------------+
> | 2            | 2019-04-01   |
> +--------------+--------------+{code}
>  
> *Expected Result* (Run only the select part from the above insert query)*:* 
> {code:java}
> +-------+------------+
> | 2     | 2019-04-01 |
> | 1     | 2019-01-01 |
> | 1     | 2019-01-02 |
> | 1     | 2019-01-03 |
> +-------+------------+{code}
>  
> Data retrieved using union all and lateral view with explode from second table is missing. 



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