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| author | Varun Gupta <varun.gupta@mariadb.com> | 2020-04-21 12:16:10 +0530 |
|---|---|---|
| committer | Varun Gupta <varun.gupta@mariadb.com> | 2020-05-01 15:17:10 +0530 |
| commit | 644d9f38b97b198ec356aadfc390e0fef97c53f0 (patch) | |
| tree | 841be926c58ac3b8689d856eb482c71f5fdb8bcd /mysql-test/main/join.result | |
| parent | 7f9dc0d84aeef01747389a3ef074217acdcb2410 (diff) | |
| download | mariadb-git-644d9f38b97b198ec356aadfc390e0fef97c53f0.tar.gz | |
MDEV-21480: Unique key using ref access though eq_ref access can be used
For a unique key if all the keyparts are NOT NULL or the predicates involving
the keyparts is NULL rejecting, then we can use EQ_REF access instead of ref
access with the unique key
Diffstat (limited to 'mysql-test/main/join.result')
| -rw-r--r-- | mysql-test/main/join.result | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/mysql-test/main/join.result b/mysql-test/main/join.result index fe6d18f7807..e667eab7eb9 100644 --- a/mysql-test/main/join.result +++ b/mysql-test/main/join.result @@ -3333,11 +3333,11 @@ show keys from t1; Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment t1 0 PRIMARY 1 pk A 1010 NULL NULL BTREE t1 0 a 1 a A 10 NULL NULL YES BTREE -# t1 must use ref(t1.a=t0.a) and rows must be 1 (and not 45): +# t1 must use eq_ref(t1.a=t0.a) and rows must be 1 (and not 45): explain select * from t0,t1 where t0.a=t1.a; id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE t0 ALL NULL NULL NULL NULL 10 Using where -1 SIMPLE t1 ref a a 5 test.t0.a 1 +1 SIMPLE t1 eq_ref a a 5 test.t0.a 1 drop table t0,t1; # # MDEV-21383: Possible range plan is not used under certain conditions |