| set hive.mapred.mode=nonstrict; |
| set hive.optimize.skewjoin.compiletime = true; |
| |
| CREATE TABLE T1_n100(key STRING, val STRING) |
| SKEWED BY (key, val) ON ((2, 12)) STORED AS TEXTFILE; |
| |
| LOAD DATA LOCAL INPATH '../../data/files/T1.txt' INTO TABLE T1_n100; |
| |
| CREATE TABLE T2_n63(key STRING, val STRING) |
| SKEWED BY (key) ON ((3)) STORED AS TEXTFILE; |
| |
| LOAD DATA LOCAL INPATH '../../data/files/T2.txt' INTO TABLE T2_n63; |
| |
| -- One of the tables is skewed by 2 columns, and the other table is |
| -- skewed by one column. Ths join is performed on the first skewed column |
| -- adding a order by at the end to make the results deterministic |
| |
| EXPLAIN |
| SELECT a.*, b.* FROM T1_n100 a JOIN T2_n63 b ON a.key = b.key; |
| |
| SELECT a.*, b.* FROM T1_n100 a JOIN T2_n63 b ON a.key = b.key |
| ORDER BY a.key, b.key, a.val, b.val; |
