| --! qt:dataset:src |
| set hive.explain.user=false; |
| explain |
| SELECT key, value FROM |
| ( |
| SELECT key, value FROM src |
| UNION ALL |
| SELECT key, key as value FROM ( |
| SELECT distinct key FROM ( |
| SELECT key, value FROM ( |
| SELECT key, value FROM src |
| UNION ALL |
| SELECT key, value FROM src |
| )t1 |
| group by key, value)t2 |
| )t3 |
| )t4 |
| group by key, value; |
| |
| SELECT key, value FROM |
| ( |
| SELECT key, value FROM src |
| UNION ALL |
| SELECT key, key as value FROM ( |
| SELECT distinct key FROM ( |
| SELECT key, value FROM ( |
| SELECT key, value FROM src |
| UNION ALL |
| SELECT key, value FROM src |
| )t1 |
| group by key, value)t2 |
| )t3 |
| )t4 |
| group by key, value; |