[jira] [Created] (HIVE-21574) return wrong result when excuting left join sql

["Panda Song (JIRA)" <ji...@apache.org>]

Panda Song created HIVE-21574:
---------------------------------

             Summary: return wrong result when excuting left join sql
                 Key: HIVE-21574
                 URL: https://issues.apache.org/jira/browse/HIVE-21574
             Project: Hive
          Issue Type: Bug
    Affects Versions: 3.1.0
         Environment: hive 3.1.0 hdfs 3.1.1
            Reporter: Panda Song


when I use a table instead of the sub select,I get the right result,much more rows are joined together(metrics old_uv is bigger!!!) 

Is there some bugs here?

Please help me ,thanks a lot!!!!!!
{quote}{{select }}
{{a.event_date,}}
{{count(distinct a.device_id) as uv,}}
{{count(distinct case when b.device_id is not null then b.device_id end) as old_uv,}}
{{count(distinct a.device_id) - count(distinct case when b.device_id is not null then b.device_id end) as new_uv}}
{{from}}
{{(}}
{{select}}
{{event_date,}}
{{device_id,}}
{{qingting_id}}
{{from datacenter.bl_page_chain_day}}
{{where event_date = '2019-03-31'}}
{{and (current_content like 'https://a.qingting.fm/membership5%'}}
{{or current_content like 'https://m.qingting.fm/vips/members%'}}
{{or current_content like 'https://sss.qingting.fm/vips/members/v2/%')}}
{{)a}}
{{left join}}
{{(select}}
{{ b.device_id}}
{{from}}
{{lzq_test.first_buy_vip a}}
{{inner join datacenter.device_qingting b on a.qingting_id = b.qingting_id}}
{{where a.first_buy < '2019-03-31'}}
{{group by b.device_id}}
{{)b}}
{{on a.device_id = b.device_id}}
{{group by a.event_date;}}{quote}
plan:
{quote}Plan optimized by CBO. |

 Vertex dependency in root stage 
 Map 1 <- Map 3 (BROADCAST_EDGE) 
 Reducer 2 <- Map 1 (SIMPLE_EDGE) 
 Reducer 5 <- Map 4 (CUSTOM_SIMPLE_EDGE), Reducer 2 (ONE_TO_ONE_EDGE) 
 Reducer 6 <- Reducer 5 (SIMPLE_EDGE) 

 Stage-0 
 Fetch Operator 
 limit:-1 
 Stage-1 
 Reducer 6 
 File Output Operator [FS_26] 
 Select Operator [SEL_25] (rows=35527639 width=349) 
 Output:["_col0","_col1","_col2","_col3"] 
 Group By Operator [GBY_24] (rows=35527639 width=349) 
 Output:["_col0","_col1","_col2"],aggregations:["count(DISTINCT KEY._col1:0._col0)","count(DISTINCT KEY._col1:1._col0)"],keys:KEY._col0 
 <-Reducer 5 [SIMPLE_EDGE] 
 SHUFFLE [RS_23] 
 PartitionCols:_col0 
 Group By Operator [GBY_22] (rows=71055278 width=349) 
 Output:["_col0","_col1","_col2","_col3","_col4"],aggregations:["count(DISTINCT _col1)","count(DISTINCT _col2)"],keys:true, _col1, _col2 
 Select Operator [SEL_20] (rows=71055278 width=349) 
 Output:["_col1","_col2"] 
 Map Join Operator [MAPJOIN_45] (rows=71055278 width=349) 
 Conds:RS_17.KEY.reducesinkkey0=RS_18.KEY.reducesinkkey0(Right Outer),Output:["_col0","_col1"] 
 <-Reducer 2 [ONE_TO_ONE_EDGE] 
 FORWARD [RS_17] 
 PartitionCols:_col0 
 Group By Operator [GBY_12] (rows=21738609 width=235) 
 Output:["_col0"],keys:KEY._col0 
 <-Map 1 [SIMPLE_EDGE] 
 SHUFFLE [RS_11] 
 PartitionCols:_col0 
 Group By Operator [GBY_10] (rows=43477219 width=235) 
 Output:["_col0"],keys:_col0 
 Map Join Operator [MAPJOIN_44] (rows=43477219 width=235) 
 Conds:SEL_2._col1=RS_7._col0(Inner),Output:["_col0"] 
 <-Map 3 [BROADCAST_EDGE] 
 BROADCAST [RS_7] 
 PartitionCols:_col0 
 Select Operator [SEL_5] (rows=301013 width=228) 
 Output:["_col0"] 
 Filter Operator [FIL_32] (rows=301013 width=228) 
 predicate:((first_buy < DATE'2019-03-31') and qingting_id is not null) 
 TableScan [TS_3] (rows=1062401 width=228) 
 lzq_test@first_buy_vip,a, transactional table,Tbl:COMPLETE,Col:NONE,Output:["qingting_id","first_buy"] 
 <-Select Operator [SEL_2] (rows=39524744 width=235) 
 Output:["_col0","_col1"] 
 Filter Operator [FIL_31] (rows=39524744 width=235) 
 predicate:qingting_id is not null 
 TableScan [TS_0] (rows=39524744 width=235) 
 datacenter@device_qingting,b, ACID table,Tbl:COMPLETE,Col:COMPLETE,Output:["device_id","qingting_id"] 
 <-Map 4 [CUSTOM_SIMPLE_EDGE] 
 PARTITION_ONLY_SHUFFLE [RS_18] 
 PartitionCols:_col0 
 Select Operator [SEL_16] (rows=64595706 width=349) 
 Output:["_col0"] 
 Filter Operator [FIL_33] (rows=64595706 width=349) 
 predicate:((current_content like 'https://a.qingting.fm/membership5%') or (current_content like 'https://m.qingting.fm/vips/members%') or (current_content like 'https://sss.qingting.fm/vips/members/v2/%')) 
 TableScan [TS_14] (rows=64595706 width=349) 
 datacenter@bl_page_chain_day,bl_page_chain_day,Tbl:COMPLETE,Col:NONE,Output:["device_id","current_content"]
{quote}



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