Fix for BUG#31612

"Trigger fired multiple times leads to gaps in auto_increment sequence".
The bug was that if a trigger fired multiple times inside a top
statement (for example top-statement is a multi-row INSERT,
and trigger is ON INSERT), and that trigger inserted into an auto_increment
column, then gaps could be observed in the auto_increment sequence,
even if there were no other users of the database (no concurrency).
It was wrong usage of THD::auto_inc_intervals_in_cur_stmt_for_binlog.
Note that the fix changes "class handler", I'll tell the Storage Engine API team.

1 files changed, 13 insertions, 0 deletions

diff --git a/mysql-test/t/trigger-trans.test b/mysql-test/t/trigger-trans.test
index 5db5b982773..ae223b2666e 100644
--- a/mysql-test/t/trigger-trans.test
+++ b/mysql-test/t/trigger-trans.test
@@ -162,3 +162,16 @@ DROP TABLE t2, t1;
 
 
 --echo End of 5.0 tests
+
+--echo BUG#31612
+--echo Trigger fired multiple times leads to gaps in auto_increment sequence
+create table t1 (a int, val char(1)) engine=InnoDB;
+create table t2 (b int auto_increment primary key,
+ val char(1)) engine=InnoDB;
+create trigger t1_after_insert after
+ insert on t1 for each row insert into t2 set val=NEW.val;
+insert into t1 values ( 123, 'a'), ( 123, 'b'), ( 123, 'c'),
+ (123, 'd'), (123, 'e'), (123, 'f'), (123, 'g');
+insert into t1 values ( 654, 'a'), ( 654, 'b'), ( 654, 'c'),
+ (654, 'd'), (654, 'e'), (654, 'f'), (654, 'g');
+select * from t2 order by b;