fix for MDEV-364

=== modified file 'sql/sql_table.cc'
--- sql/sql_table.cc    2012-06-16 07:03:07 +0000
+++ sql/sql_table.cc    2012-07-31 14:47:24 +0000
@@ -201,7 +201,7 @@
   int  part_name_len= 0;
   const char *subpart_name= NULL;
   int  subpart_name_len= 0;
-  enum enum_file_name_type {NORMAL, TEMP, RENAMED} name_type= NORMAL;
+  enum enum_file_name_type {NORMAL, TEMP, RENAMED, ALTER} name_type= NORMAL;
   const char *tmp_p;
   DBUG_ENTER("explain_filename");
   DBUG_PRINT("enter", ("from '%s'", from));
@@ -244,7 +244,7 @@
                (tmp_p[2] == 'L' || tmp_p[2] == 'l') &&
                 tmp_p[3] == '-')
       {
-        name_type= TEMP;
+        name_type= ALTER;
         tmp_p+= 4; /* sql- prefix found */
       }
       else
@@ -290,7 +290,7 @@
       subpart_name_len= strlen(subpart_name);
     else
       part_name_len= strlen(part_name);
-    if (name_type != NORMAL)
+    if (name_type == TEMP || name_type == RENAMED)
     {
       if (subpart_name)
         subpart_name_len-= 5;
@@ -334,7 +334,7 @@
       to_p= strnmov(to_p, ", ", end_p - to_p);
     if (name_type != NORMAL)
     {
-      if (name_type == TEMP)
+      if (name_type == TEMP || name_type == ALTER)
         to_p= strnmov(to_p, ER_THD_OR_DEFAULT(thd, ER_TEMPORARY_NAME),
                       end_p - to_p);
       else