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From "Gautam Kowshik (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-10996) Aggregation / Projection over Multi-Join Inner Query producing incorrect results
Date Sat, 13 Jun 2015 01:02:00 GMT

     [ https://issues.apache.org/jira/browse/HIVE-10996?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Gautam Kowshik updated HIVE-10996:
----------------------------------
    Attachment: explain_q2.txt
                explain_q1.txt

Attached query plans of query with projection over inner query : Q1 and just inner query :
Q2

> Aggregation / Projection over Multi-Join Inner Query producing incorrect results
> --------------------------------------------------------------------------------
>
>                 Key: HIVE-10996
>                 URL: https://issues.apache.org/jira/browse/HIVE-10996
>             Project: Hive
>          Issue Type: Bug
>          Components: Hive
>    Affects Versions: 1.0.0, 1.2.0, 1.1.0
>            Reporter: Gautam Kowshik
>            Priority: Minor
>         Attachments: explain_q1.txt, explain_q2.txt
>
>
> We see the following problem on 1.1.0 and 1.2.0 but not 0.13 which seems like a regression.
> The following query produces no results:
> {code}
> select s
> from (
>   select last.*, action.st2, action.n
>   from (
>     select purchase.s, purchase.timestamp, max (mevt.timestamp) as last_stage_timestamp
>     from (select * from purchase_history) purchase
>     join (select * from cart_history) mevt
>     on purchase.s = mevt.s
>     where purchase.timestamp > mevt.timestamp
>     group by purchase.s, purchase.timestamp
>   ) last
>   join (select * from events) action
>   on last.s = action.s and last.last_stage_timestamp = action.timestamp
> ) list;
> {code}
> While this one does produce results :
> {code}
> select *
> from (
>   select last.*, action.st2, action.n
>   from (
>     select purchase.s, purchase.timestamp, max (mevt.timestamp) as last_stage_timestamp
>     from (select * from purchase_history) purchase
>     join (select * from cart_history) mevt
>     on purchase.s = mevt.s
>     where purchase.timestamp > mevt.timestamp
>     group by purchase.s, purchase.timestamp
>   ) last
>   join (select * from events) action
>   on last.s = action.s and last.last_stage_timestamp = action.timestamp
> ) list;
> 1	21	20	Bob	1234
> 1	31	30	Bob	1234
> 3	51	50	Jeff	1234
> {code}
> The setup to test this is:
> {code}
> create table purchase_history (s string, product string, price double, timestamp int);
> insert into purchase_history values ('1', 'Belt', 20.00, 21);
> insert into purchase_history values ('1', 'Socks', 3.50, 31);
> insert into purchase_history values ('3', 'Belt', 20.00, 51);
> insert into purchase_history values ('4', 'Shirt', 15.50, 59);
> create table cart_history (s string, cart_id int, timestamp int);
> insert into cart_history values ('1', 1, 10);
> insert into cart_history values ('1', 2, 20);
> insert into cart_history values ('1', 3, 30);
> insert into cart_history values ('1', 4, 40);
> insert into cart_history values ('3', 5, 50);
> insert into cart_history values ('4', 6, 60);
> create table events (s string, st2 string, n int, timestamp int);
> insert into events values ('1', 'Bob', 1234, 20);
> insert into events values ('1', 'Bob', 1234, 30);
> insert into events values ('1', 'Bob', 1234, 25);
> insert into events values ('2', 'Sam', 1234, 30);
> insert into events values ('3', 'Jeff', 1234, 50);
> insert into events values ('4', 'Ted', 1234, 60);
> {code}
> I realize select * and select s are not all that interesting in this context but what
lead us to this issue was select count(distinct s) was not returning results. The above queries
are the simplified queries that produce the issue. 
> I will note that if I convert the inner join to a table and select from that the issue
does not appear.



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