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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