Merge mysql.com:/home/mydev/mysql-4.0-bug5390

into  mysql.com:/home/mydev/mysql-4.1-bug5390


sql/table.h:
  Auto merged
mysql-test/r/lock.result:
  BUG#5390 - problems with merge tables
  Manual merge from 4.0.
mysql-test/t/lock.test:
  BUG#5390 - problems with merge tables
  Manual merge from 4.0.
sql/lock.cc:
  BUG#5390 - problems with merge tables
  Manual merge from 4.0.

mysql-test/r/lock.result

@@ -47,6 +47,17 @@ unlock tables;
 lock tables t1 write, t1 as t1_alias read;
 insert into t1 select index1,nr from t1 as t1_alias;
 drop table t1,t2;
+create table t1 (c1 int);
+create table t2 (c1 int);
+create table t3 (c1 int);
+lock tables t1 write, t2 write, t3 write;
+drop table t2, t3, t1;
+create table t1 (c1 int);
+create table t2 (c1 int);
+create table t3 (c1 int);
+lock tables t1 write, t2 write, t3 write, t1 as t4 read;
+alter table t2 add column c2 int;
+drop table t1, t2, t3;
 create table t1 ( a int(11) not null auto_increment, primary key(a));
 create table t2 ( a int(11) not null auto_increment, primary key(a));
 lock tables t1 write, t2 read;

mysql-test/t/lock.test

@@ -61,6 +61,24 @@ insert into t1 select index1,nr from t1 as t1_alias;
 drop table t1,t2;
 
 #
+# BUG#5390 - problems with merge tables
+# Supplement test for the after-fix optimization
+# Check that a dropped table is correctly removed from a lock.
+create table t1 (c1 int);
+create table t2 (c1 int);
+create table t3 (c1 int);
+lock tables t1 write, t2 write, t3 write;
+# This removes one table after the other from the lock.
+drop table t2, t3, t1;
+#
+# Check that a lock merge works.
+create table t1 (c1 int);
+create table t2 (c1 int);
+create table t3 (c1 int);
+lock tables t1 write, t2 write, t3 write, t1 as t4 read;
+alter table t2 add column c2 int;
+drop table t1, t2, t3;
+
 # Bug7241 - Invalid response when DELETE .. USING and LOCK TABLES used.
 #
 create table t1 ( a int(11) not null auto_increment, primary key(a));

sql/table.h

@@ -138,6 +138,9 @@ struct st_table {
   uint next_number_index;
   uint blob_ptr_size;			/* 4 or 8 */
   uint next_number_key_offset;
+  uint lock_position;                   /* Position in MYSQL_LOCK.table */
+  uint lock_data_start;                 /* Start pos. in MYSQL_LOCK.locks */
+  uint lock_count;                      /* Number of locks */
   int current_lock;			/* Type of lock on table */
   enum tmp_table_type tmp_table;
   my_bool copy_blobs;			/* copy_blobs when storing */