Rajesh Balamohan created HIVE-22039:
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Summary: Query with CBO crashes HS2 in corner cases
Key: HIVE-22039
URL: https://issues.apache.org/jira/browse/HIVE-22039
Project: Hive
Issue Type: Bug
Components: CBO
Affects Versions: 2.3.4, 3.1.1
Reporter: Rajesh Balamohan
Here is a very simple repro for this case.
This along with CBO would crash HS2. It runs into a infinite loop creating too
many number of RexCalls and finally OOMs.
This is observed in 2.x, 3.x.
With 4.x (master branch), it does not happen. Master has
{{calcite-core-1.19.0.jar}}, where as 3.x has {{calcite-core-1.16.0.jar}}.
{noformat}
drop table if exists tableA;
drop table if exists tableB;
create table if not exists tableA(id int, reporting_date string) stored as orc;
create table if not exists tableB(id int, reporting_date string) partitioned by
(datestr string) stored as orc;
explain with tableA_cte as (
select
id,
reporting_date
from tableA
),
tableA_cte_2 as (
select
0 as id,
reporting_date
from tableA
),
tableA_cte_5 as (
select * from tableA_cte
union
select * from tableA_cte_2
),
tableB_cte_0 as (
select
id,
reporting_date
from tableB
where reporting_date = '2018-10-29'
),
tableB_cte_1 as (
select
0 as id,
reporting_date
from tableB
where datestr = '2018-10-29'
),
tableB_cte_4 as (
select * from tableB_cte_0
union
select * from tableB_cte_1
)
select
a.id as id,
b.reporting_date
from tableA_cte_5 a
join tableB_cte_4 b on (a.id = b.id and a.reporting_date = b.reporting_date);
{noformat}
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