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From "Vineet Garg (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HIVE-14442) CBO: Calcite Operator To Hive Operator(Calcite Return Path): Wrong result/plan in group by with hive.map.aggr=false
Date Fri, 05 Aug 2016 17:52:20 GMT
Vineet Garg created HIVE-14442:
----------------------------------

             Summary: 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


Reproducer

{code} set hive.cbo.returnpath.hiveop=true {code}
{code} set hive.map.aggr=false {code}

{code}
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} 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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