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Bug #16494: Updates that set a column to NULL fail sometimes

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When building the UPDATE query to send to the remote server, the
 federated storage engine built the query incorrectly if it was updating
 a field to be NULL.

 Thanks to Bjšrn Steinbrink for an initial patch for the problem.


mysql-test/r/federated.result:
  Add new results
mysql-test/t/federated.test:
  Add new regression test
sql/ha_federated.cc:
  Fix logic of how fields are added to SET and WHERE clauses of an
  UPDATE statement. Fields that were NULL were being handled incorrectly.
  Also reorganizes the code a little bit so the update of the two
  clauses is consistent.
This commit is contained in:
unknown 2006-06-26 16:59:52 -07:00
commit f3c3c9c341
3 changed files with 40 additions and 10 deletions
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17
mysql-test/t/federated.test
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@ -1309,5 +1309,22 @@ DROP TABLE federated.t1;
connection slave;
DROP TABLE federated.bug_17377_table;
#
# Bug #16494: Updates that set a column to NULL fail sometimes
#
connection slave;
create table t1 (id int not null auto_increment primary key, val int);
connection master;
eval create table t1
(id int not null auto_increment primary key, val int) engine=federated
connection='mysql://root@127.0.0.1:$SLAVE_MYPORT/test/t1';
insert into t1 values (1,0),(2,0);
update t1 set val = NULL where id = 1;
select * from t1;
connection slave;
select * from t1;
drop table t1;
connection master;
drop table t1;
source include/federated_cleanup.inc;