| --! qt:dataset:src |
| set hive.mapred.mode=nonstrict; |
| set hive.optimize.cte.materialize.threshold=1; |
| set hive.optimize.cte.materialize.full.aggregate.only=false; |
| set hive.explain.user=true; |
| |
| explain |
| with q1 as ( select key from src where key = '5') |
| select * |
| from q1 |
| ; |
| |
| with q1 as ( select key from src where key = '5') |
| select * |
| from q1 |
| ; |
| |
| -- in subquery |
| explain |
| with q1 as ( select key from src where key = '5') |
| select * from (select key from q1) a; |
| |
| with q1 as ( select key from src where key = '5') |
| select * from (select key from q1) a; |
| |
| -- chaining |
| explain |
| with q1 as ( select key from q2 where key = '5'), |
| q2 as ( select key from src where key = '5') |
| select * from (select key from q1) a; |
| |
| with q1 as ( select key from q2 where key = '5'), |
| q2 as ( select key from src where key = '5') |
| select * from (select key from q1) a; |
