Nicholas Brenwald created HIVE-11410:
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Summary: Join with subquery containing a group by incorrectly
returns no results
Key: HIVE-11410
URL: https://issues.apache.org/jira/browse/HIVE-11410
Project: Hive
Issue Type: Bug
Components: Hive
Affects Versions: 1.1.0
Reporter: Nicholas Brenwald
Priority: Minor
Start by creating a table *t* with columns *c1* and *c2* and populate with 1
row of data. For example create table *t* from an existing table which contains
at least 1 row of data by running:
{code}
create table t as select 'abc' as c1, 0 as c2 from Y limit 1;
{code}
Table *t* looks like the following:
||c1||c2||
|abc|0|
Running the following query then returns zero results.
{code}
SELECT
t1.c1
FROM
t t1
JOIN
(SELECT
t2.c1,
MAX(t2.c2) AS c2
FROM
t t2
GROUP BY
t2.c1
) t3
ON t1.c2=t3.c2
{code}
However, we expected to see the following:
||c1||
|abc|
The problem seems to relate to the fact that in the subquery, we group by
column *c1*, but this is not subsequently used in the join condition.
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