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https://issues.apache.org/jira/browse/HIVE-10792?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14605017#comment-14605017
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Sushanth Sowmyan edited comment on HIVE-10792 at 6/29/15 1:15 AM:
------------------------------------------------------------------
Removing fix version of 1.2.1 since this is not part of the already-released
1.2.1 release. Please set appropriate commit version when this fix is committed.
was (Author: sushanth):
Removing fix version of 1.2.1 since this is not part of the already-released
1.2.` release. Please set appropriate commit version when this fix is committed.
> PPD leads to wrong answer when mapper scans the same table with multiple
> aliases
> --------------------------------------------------------------------------------
>
> Key: HIVE-10792
> URL: https://issues.apache.org/jira/browse/HIVE-10792
> Project: Hive
> Issue Type: Bug
> Components: File Formats, Query Processor
> Affects Versions: 0.13.0, 0.14.0, 0.13.1, 1.0.0, 1.2.0, 1.1.0, 1.2.1
> Reporter: Dayue Gao
> Assignee: Dayue Gao
> Priority: Critical
> Attachments: HIVE-10792.1.patch, HIVE-10792.2.patch,
> HIVE-10792.test.sql
>
>
> Here's the steps to reproduce the bug.
> First of all, prepare a simple ORC table with one row
> {code}
> create table test_orc (c0 int, c1 int) stored as ORC;
> {code}
> Table: test_orc
> ||c0||c1||
> |0|1|
> The following SQL gets empty result which is not expected
> {code}
> select * from test_orc t1
> union all
> select * from test_orc t2
> where t2.c0 = 1
> {code}
> Self join is also broken
> {code}
> set hive.auto.convert.join=false; -- force common join
> select * from test_orc t1
> left outer join test_orc t2 on (t1.c0=t2.c0 and t2.c1=0);
> {code}
> It gets empty result while the expected answer is
> ||t1.c0||t1.c1||t2.c0||t2.c1||
> |0|1|NULL|NULL|
> In these cases, we pushdown predicates into OrcInputFormat. As a result,
> TableScanOperator for "t1" can't receive its rows.
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