group_min_max optimization traced10.4-mdev-6111

1 files changed, 37 insertions, 0 deletions

diff --git a/mysql-test/main/opt_trace.test b/mysql-test/main/opt_trace.test
index 944da995aba..7cdc95c12bf 100644
--- a/mysql-test/main/opt_trace.test
+++ b/mysql-test/main/opt_trace.test
@@ -46,3 +46,40 @@ insert into t2 select A.a*10 + B.a, A.a*10 + B.a, A.a*10 + B.a from t0 A, t0 B;
 explain select * from t1,t2 where t1.a=t2.b+2 and t2.a= t1.b;
 select * from information_schema.OPTIMIZER_TRACE;
 drop table t1,t2,t0;
+
+
+--echo #
+--echo # group_by min max optimization
+--echo #
+CREATE TABLE t1 (id INT NOT NULL AUTO_INCREMENT PRIMARY KEY, a INT NOT NULL, KEY(a));
+--disable_query_log
+INSERT INTO t1(a) VALUES (1), (2), (3), (4);
+INSERT INTO t1(a) SELECT a FROM t1;
+INSERT INTO t1(a) SELECT a FROM t1;
+INSERT INTO t1(a) SELECT a FROM t1;
+INSERT INTO t1(a) SELECT a FROM t1;
+INSERT INTO t1(a) SELECT a FROM t1;
+INSERT INTO t1(a) SELECT a FROM t1;
+INSERT INTO t1(a) SELECT a FROM t1;
+INSERT INTO t1(a) SELECT a FROM t1;
+INSERT INTO t1(a) SELECT a FROM t1;
+INSERT INTO t1(a) SELECT a FROM t1;
+INSERT INTO t1(a) SELECT a FROM t1;
+INSERT INTO t1(a) SELECT a FROM t1;
+INSERT INTO t1(a) SELECT a FROM t1;
+INSERT INTO t1(a) SELECT a FROM t1;
+--enable_query_log
+OPTIMIZE TABLE t1;
+EXPLAIN SELECT DISTINCT a FROM t1;
+select * from information_schema.OPTIMIZER_TRACE;
+drop table t1;
+
+--echo # 
+--echo # With group by , where clause and MIN/MAX function
+--echo # 
+CREATE TABLE t1 (a INT, b INT, c int, d int,  KEY(a,b,c,d));
+INSERT INTO t1 VALUES (1,1,1,1), (2,2,2,2), (3,3,3,3), (4,4,4,4), (1,0,1,1), (3,2,3,3), (4,5,4,4);
+ANALYZE TABLE t1;
+EXPLAIN SELECT MIN(d) FROM t1 where b=2 and c=3  group by a;
+select * from information_schema.OPTIMIZER_TRACE;
+DROP TABLE t1;