Fix needed to support MERGE tables in different databases

mysql-test/r/merge.result:
  Test of MERGE table patch
mysql-test/t/merge.test:
  Test of MERGE table patch

mysql-test/r/merge.result

@@ -194,7 +194,7 @@ t5	CREATE TABLE `t5` (
 alter table t5 type=myisam;
 drop table t5, mysqltest.t6;
 drop database mysqltest;
-drop table if exists t4,t3,t1,t2;
+drop table t4,t3,t1,t2;
 create table t1 (c char(10)) type=myisam;
 create table t2 (c char(10)) type=myisam;
 create table t3 (c char(10)) union=(t1,t2) type=merge;
@@ -540,7 +540,11 @@ a	b
 6	1
 6	2
 6	3
-drop table if exists t6, t5, t4, t3, t2, t1;
+insert into t1 values (99,NULL);
+select * from t4 where a+0 > 90;
+a	b
+99	1
+drop table t6, t5, t4, t3, t2, t1;
 CREATE TABLE t1 (  a int(11) NOT NULL default '0',  b int(11) NOT NULL default '0',  PRIMARY KEY  (a,b)) TYPE=MyISAM;
 INSERT INTO t1 VALUES (1,1), (2,1);
 CREATE TABLE t2 (  a int(11) NOT NULL default '0',  b int(11) NOT NULL default '0',  PRIMARY KEY  (a,b)) TYPE=MyISAM;
@@ -552,7 +556,7 @@ max(b)
 select max(b) from t1 where a = 2;
 max(b)
 1
-drop table if exists t3,t1,t2;
+drop table t3,t1,t2;
 create table t1 (a int not null);
 create table t2 (a int not null);
 insert into t1 values (1);
@@ -571,7 +575,7 @@ select * from t6;
 a
 1
 2
-drop table if exists t6, t3, t1, t2, t4, t5;
+drop table t6, t3, t1, t2, t4, t5;
 CREATE TABLE t1 (
 fileset_id tinyint(3) unsigned NOT NULL default '0',
 file_code varchar(32) NOT NULL default '',

mysql-test/t/merge.test

@@ -64,7 +64,7 @@ drop table t5, mysqltest.t6;
 drop database mysqltest;
 
 # Because of windows, it's important that we drop the merge tables first!
-drop table if exists t4,t3,t1,t2;
+drop table t4,t3,t1,t2;
   
 create table t1 (c char(10)) type=myisam;
 create table t2 (c char(10)) type=myisam;
@@ -188,7 +188,9 @@ select * from t1 order by a,b;
 select * from t2 order by a,b;
 select * from t5 order by a,b;
 select * from t6 order by a,b;
-drop table if exists t6, t5, t4, t3, t2, t1;
+insert into t1 values (99,NULL);
+select * from t4 where a+0 > 90;
+drop table t6, t5, t4, t3, t2, t1;
 
 CREATE TABLE t1 (  a int(11) NOT NULL default '0',  b int(11) NOT NULL default '0',  PRIMARY KEY  (a,b)) TYPE=MyISAM;
 INSERT INTO t1 VALUES (1,1), (2,1);
@@ -197,7 +199,7 @@ INSERT INTO t2 VALUES (1,2), (2,2);
 CREATE TABLE t3 (  a int(11) NOT NULL default '0',  b int(11) NOT NULL default '0',  KEY a (a,b)) TYPE=MRG_MyISAM UNION=(t1,t2);
 select max(b) from t3 where a = 2;
 select max(b) from t1 where a = 2;
-drop table if exists t3,t1,t2;
+drop table t3,t1,t2;
 
 #
 # temporary merge tables
@@ -214,7 +216,7 @@ insert into t4 values (1);
 insert into t5 values (2);
 create temporary table t6 (a int not null) TYPE=MERGE UNION=(t4,t5);
 select * from t6;
-drop table if exists t6, t3, t1, t2, t4, t5;
+drop table t6, t3, t1, t2, t4, t5;
 
 #
 # testing merge::records_in_range and optimizer

mysys/mf_loadpath.c

@@ -39,10 +39,10 @@ my_string my_load_path(my_string to, const char *path,
 	   (is_prefix((gptr) path,FN_PARENTDIR)) ||
 	   ! own_path_prefix)
   {
-    if (! my_getwd(buff,(uint) (FN_REFLEN-strlen(path)),MYF(0)))
-      VOID(strcat(buff,path));
+    if (! my_getwd(buff,(uint) (FN_REFLEN+2-strlen(path)),MYF(0)))
+      VOID(strcat(buff,path+2));
     else
-      VOID(strmov(buff,path));
+      VOID(strmov(buff,path));			/* Return org file name */
   }
   else
     VOID(strxmov(buff,own_path_prefix,path,NullS));

mysys/my_symlink.c

@@ -123,20 +123,22 @@ int my_realpath(char *to, const char *filename,
     }
     else
     {
-      /* Realpath didn't work;  Use original name */
+      /*
+	Realpath didn't work;  Use my_load_path() which is a poor substitute
+	original name but will at least be able to resolve paths that starts
+	with '.'.
+      */
       DBUG_PRINT("error",("realpath failed with errno: %d", errno));
       my_errno=errno;
       if (MyFlags & MY_WME)
 	my_error(EE_REALPATH, MYF(0), filename, my_errno);
-      if (to != filename)
-	strmov(to,filename);
+      my_load_path(to, filename, NullS);
       result= -1;
     }
   }
   DBUG_RETURN(result);
 #else
-  if (to != filename)
-    strmov(to,filename);
+  my_load_path(to, filename, NullS);
   return 0;
 #endif
 }