hive列转行

a       b       1
a       b       2
a       b       3
c       d       4
c       d       5
c       d       6

a       b       1,2,3
c       d       4,5,6

cat column_row.txt
a,b,1 
a,b,2 
a,b,3 
c,d,4 
c,d,5 
c,d,6

create table tmp.column_row
(
  col1 string,
  col2 string,
  col3 string
)
row format delimited fields terminated by ‘,‘
stored as textfile;

load data local inpath ‘/tmp/column_row.txt‘ into table tmp.column_row;

select col1,col2,concat_ws(‘,‘,collect_set(col3)) 
from tmp.column_row
group by col1,col2;

a       b       2 ,3 ,1 
c       d       6,4 ,5