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https://issues.apache.org/jira/browse/TAJO-2082?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15179475#comment-15179475
]
ASF GitHub Bot commented on TAJO-2082:
--------------------------------------
Github user hyunsik commented on a diff in the pull request:
https://github.com/apache/tajo/pull/969#discussion_r54996504
--- Diff:
tajo-core/src/main/java/org/apache/tajo/engine/planner/global/MasterPlan.java
---
@@ -23,8 +23,10 @@
import org.apache.tajo.ExecutionBlockId;
import org.apache.tajo.QueryId;
+import org.apache.tajo.annotation.NotNull;
--- End diff --
unused import
> Aggregation on a derived table which includes union can cause incorrect result
> ------------------------------------------------------------------------------
>
> Key: TAJO-2082
> URL: https://issues.apache.org/jira/browse/TAJO-2082
> Project: Tajo
> Issue Type: Bug
> Components: distributed query plan
> Reporter: Jihoon Son
> Assignee: Jihoon Son
> Priority: Blocker
> Fix For: 0.11.2
>
>
> This problem can be reproduced by running the following query on 10GB TPC-H
> data set.
> {noformat}
> select
> sum(t.cnt) as cnt, o_orderkey, o_custkey
> from
> (
> select
> o_orderkey, o_custkey, CAST(COUNT(1) AS INT4) as cnt
> from
> orders
> group by
> o_orderkey, o_custkey
> union all
> select
> o_orderkey, o_custkey, o_shippriority
> from
> orders
> ) as t
> group by
> o_orderkey, o_custkey
> {noformat}
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