Namit Jain created HIVE-3988:
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             Summary: lateral view followed by mapjoin should not be allowed
                 Key: HIVE-3988
                 URL: https://issues.apache.org/jira/browse/HIVE-3988
             Project: Hive
          Issue Type: Bug
          Components: Query Processor
            Reporter: Namit Jain


Consider the following queries:

drop table lazy_array_map;
create table lazy_array_map (map_col map<int,string>, array_col array<string>);
INSERT OVERWRITE TABLE lazy_array_map select map(1,'one',2,'two',3,'three'), 
array('100','200','300') FROM src LIMIT 1;

select /*+ MAPJOIN(a) */ * from
(SELECT array_col, myCol from lazy_array_map lateral view explode(array_col) X 
AS myCol) subq1
join
src a
on subq1.myCol = a.key;

select /*+ MAPJOIN(subq1) */ * from
(SELECT array_col, myCol from lazy_array_map lateral view explode(array_col) X 
AS myCol) subq1
join
src a
on subq1.myCol = a.key;


The last 2 queries should throw an error, but they work fine right now.
The same affect can be achieved without a mapjoin hint.

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