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From "Vineet Garg (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-14442) CBO: Calcite Operator To Hive Operator(Calcite Return Path): Wrong result/plan in group by with hive.map.aggr=false
Date Sun, 07 Aug 2016 20:53:20 GMT

     [ https://issues.apache.org/jira/browse/HIVE-14442?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Vineet Garg updated HIVE-14442:
-------------------------------
    Attachment:     (was: HIVE-14442.2.patch)

> CBO: Calcite Operator To Hive Operator(Calcite Return Path): Wrong result/plan in group
by with hive.map.aggr=false
> -------------------------------------------------------------------------------------------------------------------
>
>                 Key: HIVE-14442
>                 URL: https://issues.apache.org/jira/browse/HIVE-14442
>             Project: Hive
>          Issue Type: Sub-task
>          Components: CBO
>            Reporter: Vineet Garg
>            Assignee: Vineet Garg
>         Attachments: HIVE-14442.1.patch
>
>
> Reproducer
> {code} set hive.cbo.returnpath.hiveop=true
>  set hive.map.aggr=false
> create table abcd (a int, b int, c int, d int);
> LOAD DATA LOCAL INPATH '../../data/files/in4.txt' INTO TABLE abcd;
> {code}
> {code} explain select count(distinct a) from abcd group by b; {code}
> {code}
> STAGE PLANS:
>   Stage: Stage-1
>     Map Reduce
>       Map Operator Tree:
>           TableScan
>             alias: abcd
>             Statistics: Num rows: 19 Data size: 78 Basic stats: COMPLETE Column stats:
NONE
>             Select Operator
>               expressions: a (type: int)
>               outputColumnNames: a
>               Statistics: Num rows: 19 Data size: 78 Basic stats: COMPLETE Column stats:
NONE
>               Reduce Output Operator
>                 key expressions: a (type: int), a (type: int)
>                 sort order: ++
>                 Map-reduce partition columns: a (type: int)
>                 Statistics: Num rows: 19 Data size: 78 Basic stats: COMPLETE Column stats:
NONE
>       Reduce Operator Tree:
>         Group By Operator
>           aggregations: count(DISTINCT KEY._col1:0._col0)
>           keys: KEY._col0 (type: int)
>           mode: complete
>           outputColumnNames: b, $f1
>           Statistics: Num rows: 9 Data size: 36 Basic stats: COMPLETE Column stats: NONE
>           Select Operator
>             expressions: $f1 (type: bigint)
>             outputColumnNames: _o__c0
>             Statistics: Num rows: 9 Data size: 36 Basic stats: COMPLETE Column stats:
NONE
>             File Output Operator
>               compressed: false
>               Statistics: Num rows: 9 Data size: 36 Basic stats: COMPLETE Column stats:
NONE
>               table:
>                   input format: org.apache.hadoop.mapred.SequenceFileInputFormat
>                   output format: org.apache.hadoop.hive.ql.io.HiveSequenceFileOutputFormat
>                   serde: org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe
> {code}
> {code} explain select count(distinct a) from abcd group by c; {code}
> {code}
> STAGE PLANS:
>   Stage: Stage-1
>     Map Reduce
>       Map Operator Tree:
>           TableScan
>             alias: abcd
>             Statistics: Num rows: 19 Data size: 78 Basic stats: COMPLETE Column stats:
NONE
>             Select Operator
>               expressions: a (type: int)
>               outputColumnNames: a
>               Statistics: Num rows: 19 Data size: 78 Basic stats: COMPLETE Column stats:
NONE
>               Reduce Output Operator
>                 key expressions: a (type: int), a (type: int)
>                 sort order: ++
>                 Map-reduce partition columns: a (type: int)
>                 Statistics: Num rows: 19 Data size: 78 Basic stats: COMPLETE Column stats:
NONE
>       Reduce Operator Tree:
>         Group By Operator
>           aggregations: count(DISTINCT KEY._col1:0._col0)
>           keys: KEY._col0 (type: int)
>           mode: complete
>           outputColumnNames: c, $f1
>           Statistics: Num rows: 9 Data size: 36 Basic stats: COMPLETE Column stats: NONE
>           Select Operator
>             expressions: $f1 (type: bigint)
>             outputColumnNames: _o__c0
>             Statistics: Num rows: 9 Data size: 36 Basic stats: COMPLETE Column stats:
NONE
>             File Output Operator
>               compressed: false
>               Statistics: Num rows: 9 Data size: 36 Basic stats: COMPLETE Column stats:
NONE
>               table:
>                   input format: org.apache.hadoop.mapred.SequenceFileInputFormat
>                   output format: org.apache.hadoop.hive.ql.io.HiveSequenceFileOutputFormat
>                   serde: org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe
> {code}
> Above two cases has wrong keys in Map side Reduce Output Operator (both has a, a instead
of b,a and c,a respectively



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