| set hive.mapred.mode=nonstrict; |
| set hive.stats.autogather=false; |
| set hive.optimize.union.remove=true; |
| |
| set hive.merge.mapfiles=false; |
| set hive.merge.mapredfiles=false; |
| |
| -- SORT_QUERY_RESULTS |
| -- This is to test the union->selectstar->filesink optimization |
| -- Union of 2 map-reduce subqueries is performed followed by select and a file sink |
| -- However, all the columns are not selected. So, union cannot |
| -- be removed. |
| -- It does not matter, whether the output is merged or not. In this case, merging is turned |
| -- off |
| -- Since this test creates sub-directories for the output table outputTbl1_n17, it might be easier |
| -- to run the test only on hadoop 23. The union is removed, the select (which changes the order of |
| -- columns being selected) is pushed above the union. |
| |
| create table inputTbl1_n12(key string, val string) stored as textfile; |
| create table outputTbl1_n17(key string) stored as textfile; |
| |
| load data local inpath '../../data/files/T1.txt' into table inputTbl1_n12; |
| |
| explain |
| insert overwrite table outputTbl1_n17 |
| SELECT a.key |
| FROM ( |
| SELECT key, count(1) as `values` from inputTbl1_n12 group by key |
| UNION ALL |
| SELECT key, count(1) as `values` from inputTbl1_n12 group by key |
| ) a; |
| |
| insert overwrite table outputTbl1_n17 |
| SELECT a.key |
| FROM ( |
| SELECT key, count(1) as `values` from inputTbl1_n12 group by key |
| UNION ALL |
| SELECT key, count(1) as `values` from inputTbl1_n12 group by key |
| ) a; |
| |
| desc formatted outputTbl1_n17; |
| |
| set hive.input.format=org.apache.hadoop.hive.ql.io.HiveInputFormat; |
| select * from outputTbl1_n17; |