| source ${system:hive.root}/data/files/starships.sql; |
| |
| -- conditions on the join key from one side ; is pushed to the other side to reduce computation |
| -- however: we should not use the ratio twice (and loose accuracy) |
| -- this was the primary issue of HIVE-22238 |
| |
| set hive.explain.user=true; |
| set hive.semantic.analyzer.hook=org.apache.hadoop.hive.ql.hooks.AccurateEstimatesCheckerHook; |
| |
| explain analyze |
| select |
| s.id |
| from |
| ships s, |
| ship_types st, |
| torpedos t |
| where |
| (st.id = 1 or st.id=2) |
| and ship_type_id=st.id |
| and ship_id=s.id |
| ; |
