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https://issues.apache.org/jira/browse/HIVE-18250?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16288558#comment-16288558
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Ashutosh Chauhan commented on HIVE-18250:
-----------------------------------------
+1
> CBO gets turned off with duplicates in RR error
> -----------------------------------------------
>
> Key: HIVE-18250
> URL: https://issues.apache.org/jira/browse/HIVE-18250
> Project: Hive
> Issue Type: Bug
> Components: CBO, Query Planning
> Affects Versions: 2.0.0, 2.1.0, 2.2.0, 2.3.0
> Reporter: Ashutosh Chauhan
> Assignee: Jesus Camacho Rodriguez
> Attachments: HIVE-18250.01.patch, HIVE-18250.02.patch
>
>
> {code}
> create table t1 (a int);
> explain select t1.a as a1, min(t1.a) as a from t1 group by t1.a;
> {code}
> CBO gets turned off with:
> {code}
> WARN [2e80e34e-dc46-49cf-88bf-2c24c0262d41 main] parse.RowResolver: Found
> duplicate column alias in RR: null.a => {null, a1, _col0: int} adding null.a
> => {null, null, _col1: int}
> 2017-12-07T15:27:47,651 ERROR [2e80e34e-dc46-49cf-88bf-2c24c0262d41 main]
> parse.CalcitePlanner: CBO failed, skipping CBO.
> org.apache.hadoop.hive.ql.optimizer.calcite.CalciteSemanticException: Cannot
> add column to RR: null.a => _col1: int due to duplication, see previous
> warnings
> at
> org.apache.hadoop.hive.ql.parse.CalcitePlanner$CalcitePlannerAction.genSelectLogicalPlan(CalcitePlanner.java:3985)
> ~[hive-exec-3.0.0-SNAPSHOT.jar:3.0.0-SNAPSHOT]
> at
> org.apache.hadoop.hive.ql.parse.CalcitePlanner$CalcitePlannerAction.genLogicalPlan(CalcitePlanner.java:4313)
> ~[hive-exec-3.0.0-SNAPSHOT.jar:3.0.0-SNAPSHOT]
> at
> org.apache.hadoop.hive.ql.parse.CalcitePlanner$CalcitePlannerAction.apply(CalcitePlanner.java:1392)
> ~[hive-exec-3.0.0-SNAPSHOT.jar:3.0.0-SNAPSHOT]
> at
> org.apache.hadoop.hive.ql.parse.CalcitePlanner$CalcitePlannerAction.apply(CalcitePlanner.java:1322)
> ~[hive-exec-3.0.0-SNAPSHOT.jar:3.0.0-SNAPSHOT]
> {code}
> After that non-CBO path completes the query.
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