Merge bk-internal.mysql.com:/home/bk/mysql-4.1-engines

into  chilla.local:/home/mydev/mysql-4.1-bug14400

myisam/mi_rkey.c

@@ -93,28 +93,42 @@ int mi_rkey(MI_INFO *info, byte *buf, int inx, const byte *key, uint key_len,
                     myisam_read_vec[search_flag], info->s->state.key_root[inx]))
     {
       /*
-        If we are searching for an exact key (including the data pointer)
-        and this was added by an concurrent insert,
-        then the result is "key not found".
+        If we searching for a partial key (or using >, >=, < or <=) and
+        the data is outside of the data file, we need to continue searching
+        for the first key inside the data file
       */
-      if ((search_flag == HA_READ_KEY_EXACT) &&
-          (info->lastpos >= info->state->data_file_length))
+      if (info->lastpos >= info->state->data_file_length &&
+          (search_flag != HA_READ_KEY_EXACT ||
+           last_used_keyseg != keyinfo->seg + keyinfo->keysegs))
       {
-        my_errno= HA_ERR_KEY_NOT_FOUND;
-        info->lastpos= HA_OFFSET_ERROR;
-      }
-      else while (info->lastpos >= info->state->data_file_length)
-      {
-        /*
-	  Skip rows that are inserted by other threads since we got a lock
-	  Note that this can only happen if we are not searching after an
-	  exact key, because the keys are sorted according to position
-        */
-        if  (_mi_search_next(info, keyinfo, info->lastkey,
-                             info->lastkey_length,
-                             myisam_readnext_vec[search_flag],
-                             info->s->state.key_root[inx]))
-	  break;
+        do
+        {
+          uint not_used;
+          /*
+            Skip rows that are inserted by other threads since we got a lock
+            Note that this can only happen if we are not searching after an
+            full length exact key, because the keys are sorted
+            according to position
+          */
+          if  (_mi_search_next(info, keyinfo, info->lastkey,
+                               info->lastkey_length,
+                               myisam_readnext_vec[search_flag],
+                               info->s->state.key_root[inx]))
+            break;
+          /*
+            Check that the found key does still match the search.
+            _mi_search_next() delivers the next key regardless of its
+            value.
+          */
+          if (search_flag == HA_READ_KEY_EXACT &&
+              ha_key_cmp(keyinfo->seg, key_buff, info->lastkey, use_key_length,
+                         SEARCH_FIND, &not_used))
+          {
+            my_errno= HA_ERR_KEY_NOT_FOUND;
+            info->lastpos= HA_OFFSET_ERROR;
+            break;
+          }
+        } while (info->lastpos >= info->state->data_file_length);
       }
     }
   }

mysql-test/r/myisam.result

@@ -508,6 +508,34 @@ select c1 from t1 order by c1 limit 1;
 c1
 a
 drop table t1;
+create table t1 (a int not null, primary key(a));
+create table t2 (a int not null, b int not null, primary key(a,b));
+insert into t1 values (1),(2),(3),(4),(5),(6);
+insert into t2 values (1,1),(2,1);
+lock tables t1 read local, t2 read local;
+select straight_join * from t1,t2 force index (primary) where t1.a=t2.a;
+a	a	b
+1	1	1
+2	2	1
+insert into t2 values(2,0);
+select straight_join * from t1,t2 force index (primary) where t1.a=t2.a;
+a	a	b
+1	1	1
+2	2	1
+drop table t1,t2;
+CREATE TABLE t1 (c1 varchar(250) NOT NULL);
+CREATE TABLE t2 (c1 varchar(250) NOT NULL, PRIMARY KEY (c1));
+INSERT INTO t1 VALUES ('test000001'), ('test000002'), ('test000003');
+INSERT INTO t2 VALUES ('test000002'), ('test000003'), ('test000004');
+LOCK TABLES t1 READ LOCAL, t2 READ LOCAL;
+SELECT t1.c1 AS t1c1, t2.c1 AS t2c1 FROM t1, t2
+WHERE t1.c1 = t2.c1 HAVING t1c1 != t2c1;
+t1c1	t2c1
+INSERT INTO t2 VALUES ('test000001'), ('test000005');
+SELECT t1.c1 AS t1c1, t2.c1 AS t2c1 FROM t1, t2
+WHERE t1.c1 = t2.c1 HAVING t1c1 != t2c1;
+t1c1	t2c1
+DROP TABLE t1,t2;
 CREATE TABLE t1 (`a` int(11) NOT NULL default '0', `b` int(11) NOT NULL default '0', UNIQUE KEY `a` USING RTREE (`a`,`b`)) ENGINE=MyISAM;
 Got one of the listed errors
 create table t1 (a int, b varchar(200), c text not null) checksum=1;

mysql-test/t/myisam.test

@@ -485,6 +485,42 @@ insert into t1 values ('a'), ('b');
 select c1 from t1 order by c1 limit 1;
 drop table t1;
 
+#
+# Bug #14400  Join could miss concurrently inserted row
+#
+# Partial key.
+create table t1 (a int not null, primary key(a));
+create table t2 (a int not null, b int not null, primary key(a,b));
+insert into t1 values (1),(2),(3),(4),(5),(6);
+insert into t2 values (1,1),(2,1);
+lock tables t1 read local, t2 read local;
+select straight_join * from t1,t2 force index (primary) where t1.a=t2.a;
+connect (root,localhost,root,,test,$MASTER_MYPORT,master.sock);
+insert into t2 values(2,0);
+disconnect root;
+connection default;
+select straight_join * from t1,t2 force index (primary) where t1.a=t2.a;
+drop table t1,t2;
+#
+# Full key.
+CREATE TABLE t1 (c1 varchar(250) NOT NULL);
+CREATE TABLE t2 (c1 varchar(250) NOT NULL, PRIMARY KEY (c1));
+INSERT INTO t1 VALUES ('test000001'), ('test000002'), ('test000003');
+INSERT INTO t2 VALUES ('test000002'), ('test000003'), ('test000004');
+LOCK TABLES t1 READ LOCAL, t2 READ LOCAL;
+SELECT t1.c1 AS t1c1, t2.c1 AS t2c1 FROM t1, t2
+  WHERE t1.c1 = t2.c1 HAVING t1c1 != t2c1;
+connect (con1,localhost,root,,);
+connection con1;
+INSERT INTO t2 VALUES ('test000001'), ('test000005');
+disconnect con1;
+connection default;
+SELECT t1.c1 AS t1c1, t2.c1 AS t2c1 FROM t1, t2
+  WHERE t1.c1 = t2.c1 HAVING t1c1 != t2c1;
+DROP TABLE t1,t2;
+
+# End of 4.0 tests
+
 #
 # Test RTREE index
 #