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https://issues.apache.org/jira/browse/HIVE-7232?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14040565#comment-14040565
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Ashutosh Chauhan commented on HIVE-7232:
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[~gopalv] Do you want to review this one?
> VectorReduceSink is emitting incorrect JOIN keys
> ------------------------------------------------
>
> Key: HIVE-7232
> URL: https://issues.apache.org/jira/browse/HIVE-7232
> Project: Hive
> Issue Type: Bug
> Components: Query Processor
> Affects Versions: 0.14.0
> Reporter: Gopal V
> Assignee: Gopal V
> Attachments: HIVE-7232-extra-logging.patch, HIVE-7232.1.patch.txt,
> q5.explain.txt, q5.sql
>
>
> After HIVE-7121, tpc-h query5 has resulted in incorrect results.
> Thanks to [~navis], it has been tracked down to the auto-parallel settings
> which were initialized for ReduceSinkOperator, but not for
> VectorReduceSinkOperator. The vector version inherits, but doesn't call
> super.initializeOp() or set up the variable correctly from ReduceSinkDesc.
> The query is tpc-h query5, with extra NULL checks just to be sure.
> {code}
> ELECT n_name,
> sum(l_extendedprice * (1 - l_discount)) AS revenue
> FROM customer,
> orders,
> lineitem,
> supplier,
> nation,
> region
> WHERE c_custkey = o_custkey
> AND l_orderkey = o_orderkey
> AND l_suppkey = s_suppkey
> AND c_nationkey = s_nationkey
> AND s_nationkey = n_nationkey
> AND n_regionkey = r_regionkey
> AND r_name = 'ASIA'
> AND o_orderdate >= '1994-01-01'
> AND o_orderdate < '1995-01-01'
> and l_orderkey is not null
> and c_custkey is not null
> and l_suppkey is not null
> and c_nationkey is not null
> and s_nationkey is not null
> and n_regionkey is not null
> GROUP BY n_name
> ORDER BY revenue DESC;
> {code}
> The reducer which has the issue has the following plan
> {code}
> Reducer 3
> Reduce Operator Tree:
> Join Operator
> condition map:
> Inner Join 0 to 1
> condition expressions:
> 0 {KEY.reducesinkkey0} {VALUE._col2}
> 1 {VALUE._col0} {KEY.reducesinkkey0} {VALUE._col3}
> outputColumnNames: _col0, _col3, _col10, _col11, _col14
> Statistics: Num rows: 183333344 Data size: 95229140992 Basic
> stats: COMPLETE Column stats: NONE
> Reduce Output Operator
> key expressions: _col10 (type: int)
> sort order: +
> Map-reduce partition columns: _col10 (type: int)
> Statistics: Num rows: 183333344 Data size: 95229140992
> Basic stats: COMPLETE Column stats: NONE
> value expressions: _col0 (type: int), _col3 (type: int),
> _col11 (type: int), _col14 (type: string)
> {code}
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