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https://issues.apache.org/jira/browse/HIVE-15888?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15864935#comment-15864935
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Walter Wu commented on HIVE-15888:
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I find it has been fixed in https://issues.apache.org/jira/browse/HIVE-13602
> constant propagation 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
> constant propagation 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'. constant propagation
> optimize combine 'b.organizationid is not null' and 'b.organizationid is
> null' to 'constant false' .
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