| create table t2(a integer, b string) STORED AS ORC; |
| insert into t2 values (1, 'A1'),(2, 'A2'),(3, 'A3'),(4, 'A4'),(5, 'A5'), |
| (6, 'B1'),(7, 'B2'),(8, 'B3'),(9, 'B4'),(20, 'B5'); |
| analyze table t2 compute statistics for columns; |
| |
| set hive.stats.fetch.column.stats=true; |
| |
| set hive.stats.use.bitvectors=false; |
| |
| -- 1,2,10,11,12,13,14,15,20 => 9 |
| explain select a from t2 where a IN (-1,0,1,2,10,11,12,13,14,15,20,30,40) order by a; |
| |
| set hive.stats.use.bitvectors=true; |
| |
| -- 1,2,20 => 3 |
| explain select a from t2 where a IN (-1,0,1,2,10,11,12,13,14,15,20,30,40) order by a; |
| |
| -- A3 only => 1 |
| explain select a from t2 where b IN ('A3', 'ABC', 'AXZ') order by a; |
| |
| -- A3,B1,B5 => 3 |
| explain select a from t2 where b IN ('A3', 'B1', 'B5') order by a; |
