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MDEV-21921 Make transaction_isolation and transaction_read_only into system variables

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In MariaDB, we have a confusing problem where:
* The transaction_isolation option can be set in a configuration file, but it cannot be set dynamically.
* The tx_isolation system variable can be set dynamically, but it cannot be set in a configuration file.

Therefore, we have two different names for the same thing in different contexts. This is needlessly confusing, and it complicates the documentation. The same thing applys for transaction_read_only.

MySQL 5.7 solved this problem by making them into system variables. https://dev.mysql.com/doc/relnotes/mysql/5.7/en/news-5-7-20.html

This commit takes a similar approach by adding new system variables and marking the original ones as deprecated. This commit also resolves some legacy problems related to SET STATEMENT and transaction_isolation.
This commit is contained in:
Junqi Xie
2023-03-12 13:55:30 +08:00
committed by Daniel Black
parent 4472a7b4ff
commit d20a96f9c1
100 changed files with 1232 additions and 962 deletions
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12
mysql-test/main/ps.result
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@ -696,21 +696,21 @@ set @@time_zone:='Japan';
execute stmt;
@@time_zone
Japan
prepare stmt from "select @@tx_isolation";
prepare stmt from "select @@transaction_isolation";
execute stmt;
@@tx_isolation
@@transaction_isolation
REPEATABLE-READ
set transaction isolation level read committed;
execute stmt;
@@tx_isolation
@@transaction_isolation
REPEATABLE-READ
set transaction isolation level serializable;
execute stmt;
@@tx_isolation
@@transaction_isolation
REPEATABLE-READ
set @@tx_isolation=default;
set @@transaction_isolation=default;
execute stmt;
@@tx_isolation
@@transaction_isolation
REPEATABLE-READ
deallocate prepare stmt;
prepare stmt from "create temporary table t1 (letter enum('','a','b','c')