| --! qt:dataset:src |
| SET hive.mapred.mode=nonstrict; |
| SET hive.vectorized.execution.enabled=false; |
| SET hive.optimize.topnkey=true; |
| |
| SET hive.optimize.ppd=true; |
| SET hive.ppd.remove.duplicatefilters=true; |
| SET hive.tez.dynamic.partition.pruning=true; |
| SET hive.optimize.metadataonly=false; |
| SET hive.optimize.index.filter=true; |
| SET hive.tez.min.bloom.filter.entries=1; |
| |
| SET hive.stats.fetch.column.stats=true; |
| SET hive.cbo.enable=true; |
| |
| SET hive.optimize.topnkey=true; |
| EXPLAIN |
| SELECT key, SUM(CAST(SUBSTR(value,5) AS INT)) FROM src GROUP BY key ORDER BY key LIMIT 5; |
| SELECT key, SUM(CAST(SUBSTR(value,5) AS INT)) FROM src GROUP BY key ORDER BY key LIMIT 5; |
| |
| SET hive.optimize.topnkey=false; |
| SELECT key, SUM(CAST(SUBSTR(value,5) AS INT)) FROM src GROUP BY key ORDER BY key LIMIT 5; |
| |
| SET hive.optimize.topnkey=true; |
| EXPLAIN |
| SELECT src1.key, src2.value FROM src src1 LEFT OUTER JOIN src src2 ON (src1.key = src2.key) GROUP BY src1.key, src2.value ORDER BY src1.key LIMIT 5; |
| SELECT src1.key, src2.value FROM src src1 LEFT OUTER JOIN src src2 ON (src1.key = src2.key) GROUP BY src1.key, src2.value ORDER BY src1.key LIMIT 5; |
| |
| SET hive.optimize.topnkey=false; |
| SELECT src1.key, src2.value FROM src src1 LEFT OUTER JOIN src src2 ON (src1.key = src2.key) GROUP BY src1.key, src2.value ORDER BY src1.key LIMIT 5; |
| |
| SET hive.optimize.topnkey=true; |
| EXPLAIN |
| SELECT src1.key, src2.value FROM src src1 LEFT OUTER JOIN src src2 ON (src1.key = src2.key) GROUP BY src1.key, src2.value ORDER BY src1.key NULLS FIRST LIMIT 5; |
| SELECT src1.key, src2.value FROM src src1 LEFT OUTER JOIN src src2 ON (src1.key = src2.key) GROUP BY src1.key, src2.value ORDER BY src1.key NULLS FIRST LIMIT 5; |
| |
| SET hive.optimize.topnkey=false; |
| SELECT src1.key, src2.value FROM src src1 LEFT OUTER JOIN src src2 ON (src1.key = src2.key) GROUP BY src1.key, src2.value ORDER BY src1.key NULLS FIRST LIMIT 5; |
| |
| CREATE TABLE t_test( |
| a int, |
| b int, |
| c int |
| ); |
| |
| INSERT INTO t_test VALUES |
| (5, 2, 3), |
| (6, 2, 1), |
| (7, 8, 4), (7, 8, 4), (7, 8, 4), |
| (5, 1, 2), (5, 1, 2), (5, 1, 2); |
| |
| SET hive.optimize.topnkey=true; |
| EXPLAIN |
| SELECT a, b FROM t_test ORDER BY a, b LIMIT 3; |
| SELECT a, b FROM t_test ORDER BY a, b LIMIT 3; |
| |
| SET hive.optimize.topnkey=false; |
| SELECT a, b FROM t_test ORDER BY a, b LIMIT 3; |
| |
| SET hive.optimize.topnkey=true; |
| EXPLAIN |
| SELECT a, b FROM t_test GROUP BY a, b ORDER BY a, b LIMIT 3; |
| SELECT a, b FROM t_test GROUP BY a, b ORDER BY a, b LIMIT 3; |
| |
| SET hive.optimize.topnkey=false; |
| SELECT a, b FROM t_test GROUP BY a, b ORDER BY a, b LIMIT 3; |
| |
| SET hive.optimize.topnkey=true; |
| EXPLAIN |
| SELECT a, count(distinct b), min(c) FROM t_test GROUP BY a ORDER BY a LIMIT 3; |
| SELECT a, count(distinct b), min(c) FROM t_test GROUP BY a ORDER BY a LIMIT 3; |
| |
| SET hive.optimize.topnkey=false; |
| SELECT a, count(distinct b), min(c) FROM t_test GROUP BY a ORDER BY a LIMIT 3; |
| |
| DROP TABLE t_test; |