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Posted to issues@hive.apache.org by "ASF GitHub Bot (Jira)" <ji...@apache.org> on 2019/10/17 15:16:00 UTC
[jira] [Work logged] (HIVE-22363) ReduceDeduplication may leave an
invalid GroupByOperator behind in some cases
[ https://issues.apache.org/jira/browse/HIVE-22363?focusedWorklogId=329927&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-329927 ]
ASF GitHub Bot logged work on HIVE-22363:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 17/Oct/19 15:15
Start Date: 17/Oct/19 15:15
Worklog Time Spent: 10m
Work Description: kgyrtkirk commented on pull request #819: HIVE-22363 ReduceDeduplication may leave an invalid GroupByOperator behind in some cases
URL: https://github.com/apache/hive/pull/819
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Issue Time Tracking
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Worklog Id: (was: 329927)
Remaining Estimate: 0h
Time Spent: 10m
> ReduceDeduplication may leave an invalid GroupByOperator behind in some cases
> -----------------------------------------------------------------------------
>
> Key: HIVE-22363
> URL: https://issues.apache.org/jira/browse/HIVE-22363
> Project: Hive
> Issue Type: Bug
> Components: Physical Optimizer
> Affects Versions: 3.1.2
> Reporter: Zoltan Haindrich
> Assignee: Zoltan Haindrich
> Priority: Major
> Labels: pull-request-available
> Attachments: HIVE-22363.01.patch
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> since HIVE-11387 reducededup may traverse {{GroupByOperators}} [as well|https://github.com/apache/hive/blob/c6626edb65c2cd00576647e54db1995628fe64da/ql/src/java/org/apache/hadoop/hive/ql/optimizer/correlation/CorrelationUtilities.java#L244]
> But the removal logic only removes the first parent; so if there is some other operator (a FIL in this case) between the sink and the gby - the removal may not happen [here|https://github.com/apache/hive/blob/c6626edb65c2cd00576647e54db1995628fe64da/ql/src/java/org/apache/hadoop/hive/ql/optimizer/correlation/CorrelationUtilities.java#L458]
> {code}
> set hive.cbo.enable=false;
> drop table if exists xl1;
> create table xl1 as
> select '1' as mdl_yr_desc, 2 as seq_no,'3' as opt_desc1,4 as opt_desc,1 as row_num;
> explain
> select trim(base.mdl_yr_desc) mdl_yr_desc, trim(base.opt_desc) opt_desc
> from
> (
> SELECT trim(mdl_yr_desc) mdl_yr_desc, concat_ws(' ', collect_set(trim(opt_desc1))) AS opt_desc
> from
> (
> select t14304.*
> from
> (
> select * from xl1
> ) t14304
> where row_num = 1
> order by trim(mdl_yr_desc), cast(seq_no as int) asc
> ) x
> group by trim(mdl_yr_desc)
> ) base
> inner join
> (
> select 1 as v
> ) dedup
> on trim(base.mdl_yr_desc) != dedup.v
> group by trim(base.mdl_yr_desc), trim(base.opt_desc) ;
> {code}
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