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https://issues.apache.org/jira/browse/HIVE-22363?focusedWorklogId=331988&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-331988
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ASF GitHub Bot logged work on HIVE-22363:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 22/Oct/19 13:13
Start Date: 22/Oct/19 13:13
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#discussion_r337506882
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File path: ql/src/test/results/clientpositive/llap/explainuser_1.q.out
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@@ -4990,38 +4990,44 @@ Vertex dependency in root stage
Reducer 2 <- Map 1 (SIMPLE_EDGE)
Reducer 3 <- Reducer 2 (SIMPLE_EDGE)
Reducer 4 <- Reducer 3 (SIMPLE_EDGE)
+Reducer 5 <- Reducer 4 (SIMPLE_EDGE)
Review comment:
I have to say that I was not expecting these changes - in this case the
"grouping of key2/key3" is removed; so I'm not sure in the absencce of those
columns from partitioning the GBY will work as expected....
I've attached a screenshot from the diff where the changes could be seen
better:
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Issue Time Tracking
-------------------
Worklog Id: (was: 331988)
Time Spent: 1h 10m (was: 1h)
> 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, HIVE-22363.02.patch,
> HIVE-22363.03.patch
>
> Time Spent: 1h 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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