| set hive.mapred.mode=nonstrict; |
| create table src5_n2 (key string, value string); |
| load data local inpath '../../data/files/kv5.txt' into table src5_n2; |
| load data local inpath '../../data/files/kv5.txt' into table src5_n2; |
| |
| set mapred.reduce.tasks = 4; |
| set hive.optimize.sampling.orderby=true; |
| set hive.optimize.sampling.orderby.percent=0.66f; |
| |
| explain |
| create table total_ordered as select * from src5_n2 order by key, value; |
| create table total_ordered as select * from src5_n2 order by key, value; |
| |
| desc formatted total_ordered; |
| select * from total_ordered; |
| |
| set hive.optimize.sampling.orderby.percent=0.0001f; |
| -- rolling back to single task in case that the number of sample is not enough |
| |
| drop table total_ordered; |
| create table total_ordered as select * from src5_n2 order by key, value; |
| |
| desc formatted total_ordered; |
| select * from total_ordered; |
