Bug #83627 | inconsistent results with generated column when meets char and padding | ||
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Submitted: | 1 Nov 2016 8:16 | Modified: | 1 Nov 2016 9:28 |
Reporter: | 帅 Bang | Email Updates: | |
Status: | Verified | Impact on me: | |
Category: | MySQL Server: Optimizer | Severity: | S3 (Non-critical) |
Version: | 5.7/8.0 | OS: | Linux |
Assigned to: | CPU Architecture: | Any |
[1 Nov 2016 8:16]
帅 Bang
[1 Nov 2016 9:28]
MySQL Verification Team
Thank you for the bug report. c:\dbs>c:\dbs\8.0\bin\mysql -uroot --port=3580 -p --prompt="mysql 8.0 > " Enter password: ****** Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 4 Server version: 8.0.1-dmr Source distribution PULL: 2016-OCT-14 Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved. Oracle is a registered trademark of Oracle Corporation and/or its affiliates. Other names may be trademarks of their respective owners. Type 'help;' or '\h' for help. Type '\c' to clear the current input statement. mysql 8.0 > use test Database changed mysql 8.0 > drop table t; Query OK, 0 rows affected (0.22 sec) mysql 8.0 > set sql_mode=default; Query OK, 0 rows affected (0.00 sec) mysql 8.0 > create table t(pk int primary key,a char(5),b varchar(5)); Query OK, 0 rows affected (0.25 sec) mysql 8.0 > insert into t(pk,a,b) values(1,'a','1'); Query OK, 1 row affected (0.10 sec) mysql 8.0 > alter table t add column c varchar(10) as(concat(a,b)) stored; Query OK, 1 row affected (0.69 sec) Records: 1 Duplicates: 0 Warnings: 0 mysql 8.0 > set sql_mode=PAD_CHAR_TO_FULL_LENGTH; Query OK, 0 rows affected, 1 warning (0.01 sec) mysql 8.0 > create index idx on t(c); Query OK, 0 rows affected (0.29 sec) Records: 0 Duplicates: 0 Warnings: 0 mysql 8.0 > select * from t where concat(a,b)='a1'; +----+-------+------+------+ | pk | a | b | c | +----+-------+------+------+ | 1 | a | 1 | a1 | +----+-------+------+------+ 1 row in set (0.01 sec) mysql 8.0 > select * from t ignore index(idx) where concat(a,b)='a1'; Empty set (0.00 sec) mysql 8.0 >