BUG#1662 - ALTER TABLE LIKE ignores DATA/INDEX DIRECTPORY

Produce a warning if DATA/INDEX DIRECTORY is specified in
ALTER TABLE statement.

Ignoring of these options is documented in the symbolic links
section of the manual.

mysql-test/r/symlink.result

@@ -65,18 +65,24 @@ t9	CREATE TABLE `t9` (
 ) ENGINE=MyISAM AUTO_INCREMENT=16725 DEFAULT CHARSET=latin1 DATA DIRECTORY='TEST_DIR/var/tmp/' INDEX DIRECTORY='TEST_DIR/var/run/'
 drop database mysqltest;
 create table t1 (a int not null) engine=myisam;
+Warnings:
+Warning	0	DATA DIRECTORY option ignored
 show create table t1;
 Table	Create Table
 t1	CREATE TABLE `t1` (
   `a` int(11) NOT NULL default '0'
 ) ENGINE=MyISAM DEFAULT CHARSET=latin1
 alter table t1 add b int;
+Warnings:
+Warning	0	DATA DIRECTORY option ignored
 show create table t1;
 Table	Create Table
 t1	CREATE TABLE `t1` (
   `a` int(11) NOT NULL default '0',
   `b` int(11) default NULL
 ) ENGINE=MyISAM DEFAULT CHARSET=latin1
+Warnings:
+Warning	0	INDEX DIRECTORY option ignored
 show create table t1;
 Table	Create Table
 t1	CREATE TABLE `t1` (

sql/sql_parse.cc

@@ -2678,6 +2678,12 @@ unsent_create_error:
 	}
       }
       /* Don't yet allow changing of symlinks with ALTER TABLE */
+      if (lex->create_info.data_file_name)
+        push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, 0,
+                     "DATA DIRECTORY option ignored");
+      if (lex->create_info.index_file_name)
+        push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, 0,
+                     "INDEX DIRECTORY option ignored");
       lex->create_info.data_file_name=lex->create_info.index_file_name=0;
       /* ALTER TABLE ends previous transaction */
       if (end_active_trans(thd))