| --! qt:dataset:srcpart |
| set hive.map.aggr = true; |
| set hive.auto.convert.join=true; |
| set hive.groupby.skewindata = true; |
| explain |
| FROM srcpart c |
| JOIN srcpart d |
| ON ( c.key=d.key AND c.ds='2008-04-08' AND d.ds='2008-04-08') |
| SELECT /*+ MAPJOIN(d) */ DISTINCT c.value; |
| |
| FROM srcpart c |
| JOIN srcpart d |
| ON ( c.key=d.key AND c.ds='2008-04-08' AND d.ds='2008-04-08') |
| SELECT /*+ MAPJOIN(d) */ DISTINCT c.value as value order by value limit 10; |
| |
| set hive.map.aggr = true; |
| set hive.groupby.skewindata = false; |
| explain |
| FROM srcpart c |
| JOIN srcpart d |
| ON ( c.key=d.key AND c.ds='2008-04-08' AND d.ds='2008-04-08') |
| SELECT /*+ MAPJOIN(d) */ DISTINCT c.value; |
| |
| FROM srcpart c |
| JOIN srcpart d |
| ON ( c.key=d.key AND c.ds='2008-04-08' AND d.ds='2008-04-08') |
| SELECT /*+ MAPJOIN(d) */ DISTINCT c.value as value order by value limit 10; |
| |
| |
| set hive.map.aggr = false; |
| set hive.groupby.skewindata = true; |
| explain |
| FROM srcpart c |
| JOIN srcpart d |
| ON ( c.key=d.key AND c.ds='2008-04-08' AND d.ds='2008-04-08') |
| SELECT /*+ MAPJOIN(d) */ DISTINCT c.value; |
| |
| FROM srcpart c |
| JOIN srcpart d |
| ON ( c.key=d.key AND c.ds='2008-04-08' AND d.ds='2008-04-08') |
| SELECT /*+ MAPJOIN(d) */ DISTINCT c.value as value order by value limit 10; |
| |
| |
| set hive.map.aggr = false; |
| set hive.groupby.skewindata = false; |
| explain |
| FROM srcpart c |
| JOIN srcpart d |
| ON ( c.key=d.key AND c.ds='2008-04-08' AND d.ds='2008-04-08') |
| SELECT /*+ MAPJOIN(d) */ DISTINCT c.value; |
| |
| FROM srcpart c |
| JOIN srcpart d |
| ON ( c.key=d.key AND c.ds='2008-04-08' AND d.ds='2008-04-08') |
| SELECT /*+ MAPJOIN(d) */ DISTINCT c.value as value order by value limit 10; |
| |
| |