I'm running into a peculiar issue with nested joins and outer select. I see
this error on 1.1.0 and 1.2.0 but not 0.13 which seems like a regression.
The following query produces no results:
select sfrom (
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;
While this one does produce results
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
The setup to test this is:
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);
I realize select * and select s are not all that interesting in this
context but what lead me 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.
--
Slava Markeyev | Engineering | Upsight
Find me on LinkedIn <http://www.linkedin.com/in/slavamarkeyev>
<http://www.linkedin.com/in/slavamarkeyev>
