How to parallel grouping set in hive?
I found that one grouping set just start one mapreduce job, unless I use union all two grouping set.
for example:
select count(1)
from
table
group by a,b
grouping sets ( (a),(b),(a,b) )
this start one mapreduce job;
select count(1)
from
table
group by a,b
grouping sets ( (a),(b) )
union all
select count(1)
from
table
group by a,b
grouping sets ( (a,b) )
this can start two mapreduce jobs.
so is there any other way I can use to parallel grouping set.
hive cube
asked Nov 26 '18 at 12:29
lost3030lost3030
12
add a comment |
I found that one grouping set just start one mapreduce job, unless I use union all two grouping set.
for example:
select count(1)
from
table
group by a,b
grouping sets ( (a),(b),(a,b) )
this start one mapreduce job;
select count(1)
from
table
group by a,b
grouping sets ( (a),(b) )
union all
select count(1)
from
table
group by a,b
grouping sets ( (a,b) )
this can start two mapreduce jobs.
so is there any other way I can use to parallel grouping set.
hive cube
asked Nov 26 '18 at 12:29
lost3030lost3030
12
add a comment |
I found that one grouping set just start one mapreduce job, unless I use union all two grouping set.
for example:
select count(1)
from
table
group by a,b
grouping sets ( (a),(b),(a,b) )
this start one mapreduce job;
select count(1)
from
table
group by a,b
grouping sets ( (a),(b) )
union all
select count(1)
from
table
group by a,b
grouping sets ( (a,b) )
this can start two mapreduce jobs.
so is there any other way I can use to parallel grouping set.
hive cube
asked Nov 26 '18 at 12:29
lost3030lost3030
12
I found that one grouping set just start one mapreduce job, unless I use union all two grouping set.
for example:
select count(1)
from
table
group by a,b
grouping sets ( (a),(b),(a,b) )
this start one mapreduce job;
select count(1)
from
table
group by a,b
grouping sets ( (a),(b) )
union all
select count(1)
from
table
group by a,b
grouping sets ( (a,b) )
this can start two mapreduce jobs.
so is there any other way I can use to parallel grouping set.
hive cube
hive cube
asked Nov 26 '18 at 12:29
lost3030lost3030
12
asked Nov 26 '18 at 12:29
lost3030lost3030
12
edited Nov 29 '18 at 1:22
lost3030
asked Nov 26 '18 at 12:29
lost3030lost3030
12
asked Nov 26 '18 at 12:29
lost3030lost3030
12
asked Nov 26 '18 at 12:29
lost3030lost3030
12
12
add a comment |
add a comment |
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