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Fix for BUG#20524 "auto_increment_* not observed when inserting

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a too large value": the bug was that if MySQL generated a value for an
auto_increment column, based on auto_increment_* variables, and this value
was bigger than the column's max possible value, then that max possible
value was inserted (after issuing a warning). But this didn't honour
auto_increment_* variables (and so could cause conflicts in a master-master
replication where one master is supposed to generated only even numbers,
and the other only odd numbers), so now we "round down" this max possible
value to honour auto_increment_* variables, before inserting it.


mysql-test/r/rpl_auto_increment.result:
  result update. Before the fix, the result was that master inserted 127 in t1
  (which didn't honour auto_increment_* variables!),
  instead of failing with "duplicate key 125" like now.
mysql-test/t/rpl_auto_increment.test:
  Test for BUG#20524 "auto_increment_* not observed when inserting
  a too large value".
  We also check the pathological case (table t2) where it's impossible to
  "round down".
  The fixer of BUG#20573 will be able to use table t2 for testing his fix.
sql/handler.cc:
  If handler::update_auto_increment() generates a value larger than the field's
  max possible value, we used to simply insert this max possible value
  (after pushing a warning). Now we "round down" this max possible value to
  honour auto_increment_* variables (if at all possible), before trying the
  insertion.
This commit is contained in:
unknown
2006-07-06 14:37:09 +02:00
parent 0f6a24ad6c
commit 8646be88a1
3 changed files with 134 additions and 3 deletions
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44
mysql-test/r/rpl_auto_increment.result
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@ -183,3 +183,47 @@ a
32
42
drop table t1;
create table t1 (a tinyint not null auto_increment primary key) engine=myisam;
insert into t1 values(103);
set auto_increment_increment=11;
set auto_increment_offset=4;
insert into t1 values(null);
insert into t1 values(null);
insert into t1 values(null);
ERROR 23000: Duplicate entry '125' for key 1
select a, mod(a-@@auto_increment_offset,@@auto_increment_increment) from t1 order by a;
a mod(a-@@auto_increment_offset,@@auto_increment_increment)
103 0
114 0
125 0
create table t2 (a tinyint unsigned not null auto_increment primary key) engine=myisam;
set auto_increment_increment=10;
set auto_increment_offset=1;
set insert_id=1000;
insert into t2 values(null);
Warnings:
Warning 1264 Out of range value adjusted for column 'a' at row 1
select a, mod(a-@@auto_increment_offset,@@auto_increment_increment) from t2 order by a;
a mod(a-@@auto_increment_offset,@@auto_increment_increment)
251 0
create table t3 like t1;
set auto_increment_increment=1000;
set auto_increment_offset=700;
insert into t3 values(null);
Warnings:
Warning 1264 Out of range value adjusted for column 'a' at row 1
select * from t3 order by a;
a
127
select * from t1 order by a;
a
103
114
125
select * from t2 order by a;
a
251
select * from t3 order by a;
a
127
drop table t1,t2,t3;