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https://issues.apache.org/jira/browse/HIVE-6551?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Navis updated HIVE-6551:
------------------------
Status: Patch Available (was: Open)
> group by after join with skew join optimization references invalid task
> sometimes
> ---------------------------------------------------------------------------------
>
> Key: HIVE-6551
> URL: https://issues.apache.org/jira/browse/HIVE-6551
> Project: Hive
> Issue Type: Bug
> Reporter: Navis
> Assignee: Navis
> Priority: Trivial
> Attachments: HIVE-6551.1.patch.txt
>
>
> For example,
> {noformat}
> hive> set hive.auto.convert.join = true;
> hive> set hive.optimize.skewjoin = true;
> hive> set hive.skewjoin.key = 3;
> hive>
> > EXPLAIN FROM
> > (SELECT src.* FROM src) x
> > JOIN
> > (SELECT src.* FROM src) Y
> > ON (x.key = Y.key)
> > SELECT sum(hash(Y.key)), sum(hash(Y.value));
> OK
> STAGE DEPENDENCIES:
> Stage-8 is a root stage
> Stage-6 depends on stages: Stage-8
> Stage-5 depends on stages: Stage-6 , consists of Stage-4, Stage-2
> Stage-4
> Stage-2 depends on stages: Stage-4, Stage-1
> Stage-0 is a root stage
> ...
> {noformat}
> Stage-2 references not-existing Stage-1
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