| set hive.mapred.mode=nonstrict; |
| set hive.optimize.skewjoin.compiletime = true; |
| |
| CREATE TABLE T1_n65(key STRING, val STRING) |
| SKEWED BY (key) ON ((2)) STORED AS TEXTFILE; |
| |
| LOAD DATA LOCAL INPATH '../../data/files/T1.txt' INTO TABLE T1_n65; |
| |
| CREATE TABLE T2_n39(key STRING, val STRING) STORED AS TEXTFILE; |
| |
| LOAD DATA LOCAL INPATH '../../data/files/T2.txt' INTO TABLE T2_n39; |
| |
| CREATE TABLE T3_n14(key STRING, val STRING) |
| SKEWED BY (val) ON ((12)) STORED AS TEXTFILE; |
| |
| LOAD DATA LOCAL INPATH '../../data/files/T3.txt' INTO TABLE T3_n14; |
| |
| -- This test is for skewed join compile time optimization for more than 2 tables. |
| -- The join key for table 3 is different from the join key used for joining |
| -- tables 1 and 2. Tables 1 and 3 are skewed. Since one of the join sources for table |
| -- 3 consist of a sub-query which contains a join, the compile time skew join |
| -- optimization is not enabled for table 3, but it is used for the first join between |
| -- tables 1 and 2 |
| -- adding a order by at the end to make the results deterministic |
| |
| EXPLAIN |
| select * |
| from |
| T1_n65 a join T2_n39 b on a.key = b.key |
| join T3_n14 c on a.val = c.val; |
| |
| select * |
| from |
| T1_n65 a join T2_n39 b on a.key = b.key |
| join T3_n14 c on a.val = c.val |
| order by a.key, b.key, a.val, b.val; |
| |
