Merge chilla.local:/home/mydev/mysql-4.0--team

into  chilla.local:/home/mydev/mysql-4.0-bug14400


myisam/mi_rkey.c:
  Bug#14400 - Query joins wrong rows from table which is subject of
              "concurrent insert"
  Manual merge

myisam/mi_rkey.c

@@ -79,28 +79,42 @@ 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)
+      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
-	exact key, because the keys are sorted according to position
+          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 &&
+            _mi_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

@@ -472,3 +472,31 @@ 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;

mysql-test/t/myisam.test

@@ -458,3 +458,38 @@ 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