Tao Li created SPARK-16327:
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Summary: The two subquery in join operator can't be execute in
parallel
Key: SPARK-16327
URL: https://issues.apache.org/jira/browse/SPARK-16327
Project: Spark
Issue Type: Improvement
Components: SQL
Affects Versions: 1.6.2, 1.6.1, 1.6.0
Environment: Spark: 1.6.2
Hadoop: 2.5.0-cdh5.3.2
Hive: 0.14.0
Reporter: Tao Li
I found that the two subquery in join operator can't execute in parallel. For
example, t1 and t2 can't execute in parallel.
{code:SQL|title=test.sql|borderStyle=solid}
select t1.channel_l1 as channel, t1.pv as pv1, t2.pv as pv2
from (select channel_l1, count(*) as pv from custom.common_wap_pv where
logdate>='2016060605' and logdate<='2016060605' group by channel_l1) t1
join (select channel_l1, count(*) as pv from custom.common_wap_pv where
logdate>='2016060606' and logdate<='2016060606' group by channel_l1) t2
on t1.channel_l1 = t2.channel_l1
{code}
Physical Plan:
{code}
== Physical Plan ==
Limit 21
+- ConvertToSafe
+- Project [channel_l1#1041 AS channel#985,pv#983L AS pv1#986L,pv#984L AS
pv2#987L]
+- CartesianProduct
:- ConvertToSafe
: +- TungstenAggregate(key=[channel_l1#1041],
functions=[(count(1),mode=Final,isDistinct=false)],
output=[channel_l1#1041,pv#983L])
: +- TungstenExchange(coordinator id: 1741186649)
hashpartitioning(channel_l1#1041,200), Some(coordinator[target post-shuffle
partition size: 67108864])
: +- TungstenAggregate(key=[channel_l1#1041],
functions=[(count(1),mode=Partial,isDistinct=false)],
output=[channel_l1#1041,count#1138L])
: +- HiveTableScan [channel_l1#1041], MetastoreRelation
custom, common_wap_pv, None, [(logdate#988 >= 2016060605),(logdate#988 <=
2016060605)]
+- ConvertToSafe
+- Project [pv#984L]
+- TungstenAggregate(key=[channel_l1#1115],
functions=[(count(1),mode=Final,isDistinct=false)], output=[pv#984L])
+- TungstenExchange(coordinator id: 842269542)
hashpartitioning(channel_l1#1115,200), Some(coordinator[target post-shuffle
partition size: 67108864])
+- TungstenAggregate(key=[channel_l1#1115],
functions=[(count(1),mode=Partial,isDistinct=false)],
output=[channel_l1#1115,count#1141L])
+- HiveTableScan [channel_l1#1115], MetastoreRelation
custom, common_wap_pv, None, [(logdate#1062 >= 2016060606),(logdate#1062 <=
2016060606)]
{code}
The two subquery is not executed in parallel:
!http://7xid4y.com1.z0.glb.clouddn.com/demo.png!
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