Merge mysql.com:/home/svoj/devel/mysql/BUG24342/mysql-5.0-engines

into  mysql.com:/home/svoj/devel/mysql/BUG24342/mysql-5.1-engines


mysql-test/r/merge.result:
  Auto merged
mysql-test/t/merge.test:
  Auto merged
storage/myisam/mi_rkey.c:
  Auto merged
storage/myisam/myisamdef.h:
  Auto merged
storage/myisammrg/myrg_rkey.c:
  SCCS merged

mysql-test/r/merge.result

@@ -819,6 +819,17 @@ ALTER TABLE m1 ENGINE=MERGE UNION=(t1);
 SELECT * FROM m1;
 c1	c2	c3	c4	c5	c6	c7	c8	c9
 DROP TABLE t1, m1;
+CREATE TABLE t1 (a VARCHAR(255) CHARACTER SET latin1 COLLATE latin1_german2_ci,
+b INT, INDEX(a,b));
+CREATE TABLE t2 LIKE t1;
+CREATE TABLE t3 LIKE t1;
+ALTER TABLE t3 ENGINE=MERGE UNION=(t1,t2);
+INSERT INTO t1 VALUES ('ss',1);
+INSERT INTO t2 VALUES ('ss',2),(0xDF,2);
+SELECT COUNT(*) FROM t3 WHERE a=0xDF AND b=2;
+COUNT(*)
+2
+DROP TABLE t1,t2,t3;
 create table t1 (b bit(1));
 create table t2 (b bit(1));
 create table tm (b bit(1)) engine = merge union = (t1,t2);

mysql-test/t/merge.test

@@ -451,6 +451,19 @@ ALTER TABLE m1 ENGINE=MERGE UNION=(t1);
 SELECT * FROM m1;
 DROP TABLE t1, m1;
 
+#
+# BUG#24342 - Incorrect results with query over MERGE table
+#
+CREATE TABLE t1 (a VARCHAR(255) CHARACTER SET latin1 COLLATE latin1_german2_ci,
+                 b INT, INDEX(a,b));
+CREATE TABLE t2 LIKE t1;
+CREATE TABLE t3 LIKE t1;
+ALTER TABLE t3 ENGINE=MERGE UNION=(t1,t2);
+INSERT INTO t1 VALUES ('ss',1);
+INSERT INTO t2 VALUES ('ss',2),(0xDF,2);
+SELECT COUNT(*) FROM t3 WHERE a=0xDF AND b=2;
+DROP TABLE t1,t2,t3;
+
 # End of 4.1 tests
 
 #

storage/myisam/mi_rkey.c

@@ -49,7 +49,7 @@ int mi_rkey(MI_INFO *info, byte *buf, int inx, const byte *key,
     key_buff=info->lastkey+info->s->base.max_key_length;
     pack_key_length= keypart_map;
     bmove(key_buff, key, pack_key_length);
-    last_used_keyseg= 0;
+    last_used_keyseg= info->s->keyinfo[inx].seg + info->last_used_keyseg;
   }
   else
   {
@@ -60,6 +60,7 @@ int mi_rkey(MI_INFO *info, byte *buf, int inx, const byte *key,
 				 keypart_map, &last_used_keyseg);
     /* Save packed_key_length for use by the MERGE engine. */
     info->pack_key_length= pack_key_length;
+    info->last_used_keyseg= last_used_keyseg - info->s->keyinfo[inx].seg;
     DBUG_EXECUTE("key",_mi_print_key(DBUG_FILE, keyinfo->seg,
 				     key_buff, pack_key_length););
   }

storage/myisam/myisamdef.h

@@ -276,6 +276,7 @@ struct st_myisam_info {
   enum ha_rkey_function last_key_func;  /* CONTAIN, OVERLAP, etc */
   uint  save_lastkey_length;
   uint  pack_key_length;                /* For MYISAMMRG */
+  uint16 last_used_keyseg;              /* For MyISAMMRG */
   int	errkey;				/* Got last error on this key */
   int   lock_type;			/* How database was locked */
   int   tmp_lock_type;			/* When locked by readinfo */

storage/myisammrg/myrg_rkey.c

@@ -40,12 +40,14 @@ int myrg_rkey(MYRG_INFO *info,byte *buf,int inx, const byte *key,
 {
   byte *key_buff;
   uint pack_key_length;
+  uint16 last_used_keyseg;
   MYRG_TABLE *table;
   MI_INFO *mi;
   int err;
   DBUG_ENTER("myrg_rkey");
   LINT_INIT(key_buff);
   LINT_INIT(pack_key_length);
+  LINT_INIT(last_used_keyseg);
 
   if (_myrg_init_queue(info,inx,search_flag))
     DBUG_RETURN(my_errno);
@@ -60,10 +62,12 @@ int myrg_rkey(MYRG_INFO *info,byte *buf,int inx, const byte *key,
       /* Get the saved packed key and packed key length. */
       key_buff=(byte*) mi->lastkey+mi->s->base.max_key_length;
       pack_key_length=mi->pack_key_length;
+      last_used_keyseg= mi->last_used_keyseg;
     }
     else
     {
       mi->once_flags|= USE_PACKED_KEYS;
+      mi->last_used_keyseg= last_used_keyseg;
       err=mi_rkey(mi, 0, inx, key_buff, pack_key_length, search_flag);
     }
     info->last_used_table=table+1;