Walter Wu created HIVE-15888:
--------------------------------
Summary: PPD optimizer failed when query has the same alias with
subquery
Key: HIVE-15888
URL: https://issues.apache.org/jira/browse/HIVE-15888
Project: Hive
Issue Type: Bug
Components: Logical Optimizer
Affects Versions: 1.2.1
Reporter: Walter Wu
Example :
select *
from dpdim_employee_org_d c
join
(
select a.* from dpmid_md_organization a
left outer join dpmid_md_organization b
on a.organizationid = b.superiororganizationid and b.hisdate = '2016-10-05'
where a.hisdate = '2016-09-05'
and b.organizationid is null
) b
on c.org_id = b.organizationid
and c.hp_cal_dt = '2016-09-05' limit 10;
Description:
when ppd optimize is enabled this query has empty result . If we unenabled ppd
optimize or we replace the subquery alias 'b' with 'b1' , this query will work
correctly.
I explain this query and find that after ppd optimize Filter Operator predicate
conf changed from 'predicate: superiororganizationid is not null (type:
boolean)' to 'predicate: false (type: boolean)'.
The subquery has a filter predicate conf 'b.organizationid is
null','b.organizationid' should equal to 'b:b.organizationid' . The outer query
has a filter predicate conf 'b.organizationid is not null', 'b.organizationid'
should equal to 'b:a.organizationid'. While rowSchema get Column Info on
tabAlias:'b' and alias:'organizationid'. ppd optimize combine 'b.organizationid
is not null' and 'b.organizationid is null' to 'constant false' .
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