| --! qt:dataset:src1 |
| --! qt:dataset:src |
| set hive.mapred.mode=nonstrict; |
| set hive.explain.user=false; |
| set hive.auto.convert.join=false; |
| set hive.optimize.correlation=false; |
| -- This query has a GroupByOperator folling JoinOperator and they share the same keys. |
| -- When Correlation Optimizer is turned off, three MR jobs will be generated. |
| -- When Correlation Optimizer is turned on, two MR jobs will be generated |
| -- and JoinOperator (on the column of key) and GroupByOperator (also on the column |
| -- of key) will be executed in the first MR job. |
| EXPLAIN |
| SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt)) |
| FROM (SELECT x.key AS key, count(1) AS cnt |
| FROM src1 x JOIN src y ON (x.key = y.key) |
| GROUP BY x.key) tmp; |
| |
| SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt)) |
| FROM (SELECT x.key AS key, count(1) AS cnt |
| FROM src1 x JOIN src y ON (x.key = y.key) |
| GROUP BY x.key) tmp; |
| |
| set hive.optimize.correlation=true; |
| EXPLAIN |
| SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt)) |
| FROM (SELECT x.key AS key, count(1) AS cnt |
| FROM src1 x JOIN src y ON (x.key = y.key) |
| GROUP BY x.key) tmp; |
| |
| SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt)) |
| FROM (SELECT x.key AS key, count(1) AS cnt |
| FROM src1 x JOIN src y ON (x.key = y.key) |
| GROUP BY x.key) tmp; |
| |
| set hive.auto.convert.join=true; |
| set hive.optimize.correlation=true; |
| -- Enable hive.auto.convert.join. |
| -- Correlation Optimizer will detect that the join will be converted to a Map-join, |
| -- so it will not try to optimize this query. |
| -- We should generate 1 MR job for subquery tmp. |
| EXPLAIN |
| SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt)) |
| FROM (SELECT x.key AS key, count(1) AS cnt |
| FROM src1 x JOIN src y ON (x.key = y.key) |
| GROUP BY x.key) tmp; |
| |
| SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt)) |
| FROM (SELECT x.key AS key, count(1) AS cnt |
| FROM src1 x JOIN src y ON (x.key = y.key) |
| GROUP BY x.key) tmp; |
| |
| set hive.auto.convert.join=false; |
| set hive.optimize.correlation=false; |
| -- If the key of a GroupByOperator is the left table's key in |
| -- a Left Semi Join, these two operators will be executed in |
| -- the same MR job when Correlation Optimizer is enabled. |
| EXPLAIN |
| SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt)) |
| FROM (SELECT x.key AS key, count(1) AS cnt |
| FROM src1 x LEFT SEMI JOIN src y ON (x.key = y.key) |
| GROUP BY x.key) tmp; |
| |
| SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt)) |
| FROM (SELECT x.key AS key, count(1) AS cnt |
| FROM src1 x LEFT SEMI JOIN src y ON (x.key = y.key) |
| GROUP BY x.key) tmp; |
| |
| set hive.optimize.correlation=true; |
| EXPLAIN |
| SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt)) |
| FROM (SELECT x.key AS key, count(1) AS cnt |
| FROM src1 x LEFT SEMI JOIN src y ON (x.key = y.key) |
| GROUP BY x.key) tmp; |
| |
| SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt)) |
| FROM (SELECT x.key AS key, count(1) AS cnt |
| FROM src1 x LEFT SEMI JOIN src y ON (x.key = y.key) |
| GROUP BY x.key) tmp; |
| |
| set hive.auto.convert.join=false; |
| set hive.optimize.correlation=false; |
| -- If the key of a GroupByOperator is the left table's key in |
| -- a Left Outer Join, these two operators will be executed in |
| -- the same MR job when Correlation Optimizer is enabled. |
| EXPLAIN |
| SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt)) |
| FROM (SELECT x.key AS key, count(1) AS cnt |
| FROM src1 x LEFT OUTER JOIN src y ON (x.key = y.key) |
| GROUP BY x.key) tmp; |
| |
| SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt)) |
| FROM (SELECT x.key AS key, count(1) AS cnt |
| FROM src1 x LEFT OUTER JOIN src y ON (x.key = y.key) |
| GROUP BY x.key) tmp; |
| |
| set hive.optimize.correlation=true; |
| EXPLAIN |
| SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt)) |
| FROM (SELECT x.key AS key, count(1) AS cnt |
| FROM src1 x LEFT OUTER JOIN src y ON (x.key = y.key) |
| GROUP BY x.key) tmp; |
| |
| SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt)) |
| FROM (SELECT x.key AS key, count(1) AS cnt |
| FROM src1 x LEFT OUTER JOIN src y ON (x.key = y.key) |
| GROUP BY x.key) tmp; |
| |
| |
| set hive.optimize.correlation=false; |
| -- If the key of a GroupByOperator is the right table's key in |
| -- a Left Outer Join, we cannot use a single MR to execute these two |
| -- operators because those keys with a null value are not grouped. |
| EXPLAIN |
| SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt)) |
| FROM (SELECT y.key AS key, count(1) AS cnt |
| FROM src1 x LEFT OUTER JOIN src y ON (x.key = y.key) |
| GROUP BY y.key) tmp; |
| |
| SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt)) |
| FROM (SELECT y.key AS key, count(1) AS cnt |
| FROM src1 x LEFT OUTER JOIN src y ON (x.key = y.key) |
| GROUP BY y.key) tmp; |
| |
| set hive.optimize.correlation=true; |
| EXPLAIN |
| SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt)) |
| FROM (SELECT y.key AS key, count(1) AS cnt |
| FROM src1 x LEFT OUTER JOIN src y ON (x.key = y.key) |
| GROUP BY y.key) tmp; |
| |
| SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt)) |
| FROM (SELECT y.key AS key, count(1) AS cnt |
| FROM src1 x LEFT OUTER JOIN src y ON (x.key = y.key) |
| GROUP BY y.key) tmp; |
| |
| set hive.optimize.correlation=false; |
| -- If a column of the key of a GroupByOperator is the right table's key in |
| -- a Left Outer Join, we cannot use a single MR to execute these two |
| -- operators because those keys with a null value are not grouped. |
| EXPLAIN |
| SELECT x.key, y.value, count(1) AS cnt |
| FROM src1 x LEFT OUTER JOIN src y ON (x.key = y.key AND x.value = y.value) |
| GROUP BY x.key, y.value; |
| |
| SELECT x.key, y.value, count(1) AS cnt |
| FROM src1 x LEFT OUTER JOIN src y ON (x.key = y.key AND x.value = y.value) |
| GROUP BY x.key, y.value; |
| |
| set hive.optimize.correlation=true; |
| EXPLAIN |
| SELECT x.key, y.value, count(1) AS cnt |
| FROM src1 x LEFT OUTER JOIN src y ON (x.key = y.key AND x.value = y.value) |
| GROUP BY x.key, y.value; |
| |
| SELECT x.key, y.value, count(1) AS cnt |
| FROM src1 x LEFT OUTER JOIN src y ON (x.key = y.key AND x.value = y.value) |
| GROUP BY x.key, y.value; |
| |
| set hive.optimize.correlation=false; |
| -- If the key of a GroupByOperator is the right table's key in |
| -- a Right Outer Join, these two operators will be executed in |
| -- the same MR job when Correlation Optimizer is enabled. |
| EXPLAIN |
| SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt)) |
| FROM (SELECT y.key AS key, count(1) AS cnt |
| FROM src1 x RIGHT OUTER JOIN src y ON (x.key = y.key) |
| GROUP BY y.key) tmp; |
| |
| SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt)) |
| FROM (SELECT y.key AS key, count(1) AS cnt |
| FROM src1 x RIGHT OUTER JOIN src y ON (x.key = y.key) |
| GROUP BY y.key) tmp; |
| |
| set hive.optimize.correlation=true; |
| EXPLAIN |
| SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt)) |
| FROM (SELECT y.key AS key, count(1) AS cnt |
| FROM src1 x RIGHT OUTER JOIN src y ON (x.key = y.key) |
| GROUP BY y.key) tmp; |
| |
| SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt)) |
| FROM (SELECT y.key AS key, count(1) AS cnt |
| FROM src1 x RIGHT OUTER JOIN src y ON (x.key = y.key) |
| GROUP BY y.key) tmp; |
| |
| |
| set hive.optimize.correlation=false; |
| -- If the key of a GroupByOperator is the left table's key in |
| -- a Right Outer Join, we cannot use a single MR to execute these two |
| -- operators because those keys with a null value are not grouped. |
| EXPLAIN |
| SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt)) |
| FROM (SELECT x.key AS key, count(1) AS cnt |
| FROM src1 x RIGHT OUTER JOIN src y ON (x.key = y.key) |
| GROUP BY x.key) tmp; |
| |
| SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt)) |
| FROM (SELECT x.key AS key, count(1) AS cnt |
| FROM src1 x RIGHT OUTER JOIN src y ON (x.key = y.key) |
| GROUP BY x.key) tmp; |
| |
| set hive.optimize.correlation=true; |
| EXPLAIN |
| SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt)) |
| FROM (SELECT x.key AS key, count(1) AS cnt |
| FROM src1 x RIGHT OUTER JOIN src y ON (x.key = y.key) |
| GROUP BY x.key) tmp; |
| |
| SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt)) |
| FROM (SELECT x.key AS key, count(1) AS cnt |
| FROM src1 x RIGHT OUTER JOIN src y ON (x.key = y.key) |
| GROUP BY x.key) tmp; |
| |
| set hive.optimize.correlation=false; |
| -- This query has a Full Outer Join followed by a GroupByOperator and |
| -- they share the same key. Because those keys with a null value are not grouped |
| -- in the output of the Full Outer Join, we cannot use a single MR to execute |
| -- these two operators. |
| SET hive.mapjoin.full.outer=false; |
| EXPLAIN |
| SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt)) |
| FROM (SELECT x.key AS key, count(1) AS cnt |
| FROM src1 x FULL OUTER JOIN src y ON (x.key = y.key) |
| GROUP BY x.key) tmp; |
| |
| SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt)) |
| FROM (SELECT x.key AS key, count(1) AS cnt |
| FROM src1 x FULL OUTER JOIN src y ON (x.key = y.key) |
| GROUP BY x.key) tmp; |
| |
| SET hive.mapjoin.full.outer=true; |
| SET hive.merge.nway.joins=false; |
| EXPLAIN |
| SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt)) |
| FROM (SELECT x.key AS key, count(1) AS cnt |
| FROM src1 x FULL OUTER JOIN src y ON (x.key = y.key) |
| GROUP BY x.key) tmp; |
| |
| SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt)) |
| FROM (SELECT x.key AS key, count(1) AS cnt |
| FROM src1 x FULL OUTER JOIN src y ON (x.key = y.key) |
| GROUP BY x.key) tmp; |
| SET hive.merge.nway.joins=true; |
| |
| set hive.optimize.correlation=true; |
| SET hive.mapjoin.full.outer=false; |
| EXPLAIN |
| SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt)) |
| FROM (SELECT x.key AS key, count(1) AS cnt |
| FROM src1 x FULL OUTER JOIN src y ON (x.key = y.key) |
| GROUP BY x.key) tmp; |
| |
| SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt)) |
| FROM (SELECT x.key AS key, count(1) AS cnt |
| FROM src1 x FULL OUTER JOIN src y ON (x.key = y.key) |
| GROUP BY x.key) tmp; |
| |
| SET hive.mapjoin.full.outer=true; |
| SET hive.merge.nway.joins=false; |
| EXPLAIN |
| SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt)) |
| FROM (SELECT x.key AS key, count(1) AS cnt |
| FROM src1 x FULL OUTER JOIN src y ON (x.key = y.key) |
| GROUP BY x.key) tmp; |
| |
| SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt)) |
| FROM (SELECT x.key AS key, count(1) AS cnt |
| FROM src1 x FULL OUTER JOIN src y ON (x.key = y.key) |
| GROUP BY x.key) tmp; |
| SET hive.merge.nway.joins=true; |
| |
| set hive.auto.convert.join=false; |
| set hive.optimize.correlation=false; |
| -- Currently, we only handle exactly same keys, this query will not be optimized |
| EXPLAIN |
| SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.value)), SUM(HASH(tmp.cnt)) |
| FROM (SELECT x.key AS key, x.value AS value, count(1) AS cnt |
| FROM src1 x JOIN src y ON (x.key = y.key) |
| GROUP BY x.key, x.value) tmp; |
| |
| SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.value)), SUM(HASH(tmp.cnt)) |
| FROM (SELECT x.key AS key, x.value AS value, count(1) AS cnt |
| FROM src1 x JOIN src y ON (x.key = y.key) |
| GROUP BY x.key, x.value) tmp; |
| |
| set hive.optimize.correlation=true; |
| EXPLAIN |
| SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.value)), SUM(HASH(tmp.cnt)) |
| FROM (SELECT x.key AS key, x.value AS value, count(1) AS cnt |
| FROM src1 x JOIN src y ON (x.key = y.key) |
| GROUP BY x.key, x.value) tmp; |
| |
| SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.value)), SUM(HASH(tmp.cnt)) |
| FROM (SELECT x.key AS key, x.value AS value, count(1) AS cnt |
| FROM src1 x JOIN src y ON (x.key = y.key) |
| GROUP BY x.key, x.value) tmp; |
| |
| set hive.optimize.correlation=false; |
| -- Currently, we only handle exactly same keys, this query will not be optimized |
| EXPLAIN |
| SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt)) |
| FROM (SELECT x.key AS key, count(1) AS cnt |
| FROM src1 x JOIN src y ON (x.key = y.key AND x.value = y.value) |
| GROUP BY x.key) tmp; |
| |
| SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt)) |
| FROM (SELECT x.key AS key, count(1) AS cnt |
| FROM src1 x JOIN src y ON (x.key = y.key AND x.value = y.value) |
| GROUP BY x.key) tmp; |
| |
| set hive.optimize.correlation=true; |
| EXPLAIN |
| SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt)) |
| FROM (SELECT x.key AS key, count(1) AS cnt |
| FROM src1 x JOIN src y ON (x.key = y.key AND x.value = y.value) |
| GROUP BY x.key) tmp; |
| |
| SELECT SUM(HASH(tmp.key)), SUM(HASH(tmp.cnt)) |
| FROM (SELECT x.key AS key, count(1) AS cnt |
| FROM src1 x JOIN src y ON (x.key = y.key AND x.value = y.value) |
| GROUP BY x.key) tmp; |