Work on HIVE-22120 started by Ramesh Kumar Thangarajan.
> Fix wrong results/ArrayOutOfBound exception in left outer map joins on 
> specific boundary conditions
> ---------------------------------------------------------------------------------------------------
>                 Key: HIVE-22120
>                 URL: https://issues.apache.org/jira/browse/HIVE-22120
>             Project: Hive
>          Issue Type: Bug
>          Components: Hive, llap, Vectorization
>    Affects Versions: 4.0.0
>            Reporter: Ramesh Kumar Thangarajan
>            Assignee: Ramesh Kumar Thangarajan
>            Priority: Major
> Vectorized version of left outer map join produces wrong results or 
> encounters ArrayOutOfBound exception.
> The boundary conditions are:
>  * The complete batch of the big table should have the join key repeated for 
> all the join columns.
>  * The complete batch of the big table should have not have a matched key 
> value in the small table
>  * The repeated value should not be a null value
>  * Some rows should be filtered out as part of the on clause filter.

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