diff options
Diffstat (limited to 'mysql-test/main/key.test')
| -rw-r--r-- | mysql-test/main/key.test | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/mysql-test/main/key.test b/mysql-test/main/key.test index ccaef163d08..4e3e02c8add 100644 --- a/mysql-test/main/key.test +++ b/mysql-test/main/key.test @@ -1,6 +1,7 @@ --disable_warnings drop table if exists t1,t2,t3; --enable_warnings +--source include/have_sequence.inc SET SQL_WARNINGS=1; # @@ -582,3 +583,23 @@ EXPLAIN SELECT a, SUM( b ) FROM t1 FORCE INDEX( a ) GROUP BY a; SHOW STATUS LIKE 'Last_query_cost'; DROP TABLE t1; + +--echo # +--echo # MDEV-21480: Unique key using ref access though eq_ref access can be used +--echo # + +create table t1(a int, b int,c int, primary key(a), unique key(b,c)); +insert into t1 select seq, seq, seq from seq_1_to_10; + +create table t2(a int, b int,c int); +insert into t2 select seq, seq, seq+1 from seq_1_to_100; + +EXPLAIN SELECT t1.c, t2.c FROM t1, t2 WHERE t1.b=t2.a and t1.c=t2.b; +SELECT t1.c, t2.c FROM t1, t2 WHERE t1.b=t2.a and t1.c=t2.b; + +alter table t1 drop PRIMARY KEY; +alter table t1 add PRIMARY KEY(b,c); +EXPLAIN SELECT t1.c, t2.c FROM t1, t2 WHERE t1.b=t2.a and t1.c=t2.b; +SELECT t1.c, t2.c FROM t1, t2 WHERE t1.b=t2.a and t1.c=t2.b; + +drop table t1,t2; |