Fix for bug#5508 after Sanja's review

mysql-test/r/view.result:
  test results for rename table view1 to view2
mysql-test/t/view.test:
  tests for rename table view1 to view2
sql/share/errmsg.txt:
  added new errormessage (schema change not allowed in rename table view)
sql/sql_rename.cc:
  added support for renaming views
sql/sql_view.cc:
  added new function mysql_rename_view
sql/sql_view.h:
  added prototype mysql_rename_view

mysql-test/r/view.result

@@ -845,6 +845,15 @@ select * from v1;
 cast(1 as char(3))
 1
 drop view v1;
+create table t1 (a int);
+create view v1 as select a from t1;
+create database seconddb;
+rename table v1 to seconddb.v1;
+ERROR HY000: Changing schema from 'test' to 'seconddb' is not allowed.
+rename table v1 to v2;
+drop table t1;
+drop view v2;
+drop database seconddb;
 create view v1 as select 'a',1;
 create view v2 as select * from v1 union all select * from v1;
 create view v3 as select * from v2 where 1 = (select `1` from v2);

mysql-test/t/view.test

@@ -785,6 +785,19 @@ show create view v1;
 select * from v1;
 drop view v1;
 
+#
+# renaming views
+#
+create table t1 (a int);
+create view v1 as select a from t1;
+create database seconddb;
+-- error 1450
+rename table v1 to seconddb.v1;
+rename table v1 to v2;
+drop table t1;
+drop view v2;
+drop database seconddb;
+
 #
 # bug handling from VIEWs
 #

sql/share/errmsg.txt

@@ -5413,3 +5413,5 @@ ER_VIEW_OTHER_USER
         eng "You need the SUPER privilege for creation view with %-.64s@%-.64s definer"
 ER_NO_SUCH_USER
         eng "There is not %-.64s@%-.64s registered"
+ER_FORBID_SCHEMA_CHANGE
+	eng "Changing schema from '%-.64s' to '%-.64s' is not allowed."

sql/sql_rename.cc

@@ -133,6 +133,7 @@ static TABLE_LIST *
 rename_tables(THD *thd, TABLE_LIST *table_list, bool skip_error)
 {
   TABLE_LIST *ren_table,*new_table;
+  frm_type_enum frm_type;
   DBUG_ENTER("rename_tables");
 
   for (ren_table= table_list; ren_table; ren_table= new_table->next_local)
@@ -164,18 +165,35 @@ rename_tables(THD *thd, TABLE_LIST *table_list, bool skip_error)
 	    ren_table->db, old_alias,
 	    reg_ext);
     unpack_filename(name, name);
-    if ((table_type=get_table_type(thd, name)) == DB_TYPE_UNKNOWN)
+    if ((frm_type= mysql_frm_type(name)) == FRMTYPE_TABLE &&
+        (table_type= get_table_type(thd, name)) == DB_TYPE_UNKNOWN)
     {
       my_error(ER_FILE_NOT_FOUND, MYF(0), name, my_errno);
       if (!skip_error)
-	DBUG_RETURN(ren_table);
+        DBUG_RETURN(ren_table);
     }
-    else if (mysql_rename_table(table_type,
-				ren_table->db, old_alias,
-				new_table->db, new_alias))
-    {
-      if (!skip_error)
-	DBUG_RETURN(ren_table);
+    else {
+      int rc= 1;
+      switch (frm_type)
+      {
+        case FRMTYPE_TABLE:
+          rc= mysql_rename_table(table_type, ren_table->db, old_alias,
+                                 new_table->db, new_alias);
+          break;
+        case FRMTYPE_VIEW:
+          /* change of schema is not allowed */
+          if (strcmp(ren_table->db, new_table->db))
+            my_error(ER_FORBID_SCHEMA_CHANGE, MYF(0), ren_table->db, 
+                     new_table->db);
+          else
+            rc= mysql_rename_view(thd, new_alias, ren_table);
+          break;
+        case FRMTYPE_ERROR:
+        default:
+          my_error(ER_FILE_NOT_FOUND, MYF(0), name, my_errno);
+      }
+      if (rc && !skip_error)
+	    DBUG_RETURN(ren_table);
     }
   }
   DBUG_RETURN(0);

sql/sql_view.cc

@@ -479,8 +479,12 @@ err:
 
 /* index of revision number in following table */
 static const int revision_number_position= 8;
+/* index of source */
+static const int source_number_position= 11;
 /* index of last required parameter for making view */
 static const int required_view_parameters= 10;
+/* number of backups */
+static const int num_view_backups= 3;
 
 /*
   table of VIEW .frm field descriptors
@@ -708,7 +712,7 @@ loop_out:
   }
 
   if (sql_create_definition_file(&dir, &file, view_file_type,
-				 (gptr)view, view_parameters, 3))
+				 (gptr)view, view_parameters, num_view_backups))
   {
     DBUG_RETURN(thd->net.report_error? -1 : 1);
   }
@@ -1367,3 +1371,97 @@ int view_checksum(THD *thd, TABLE_LIST *view)
           HA_ADMIN_WRONG_CHECKSUM :
           HA_ADMIN_OK);
 }
+
+bool rename_view_files(const char *schema, const char *old_name, 
+                       const char *new_name, ulonglong revision)
+{
+  char old_path[FN_REFLEN], new_path[FN_REFLEN], arc_path[FN_REFLEN];
+
+  strxnmov(old_path, FN_REFLEN, mysql_data_home, "/", schema, "/",
+           old_name, reg_ext, NullS);
+  (void) unpack_filename(old_path, old_path);
+
+  strxnmov(new_path, FN_REFLEN, mysql_data_home, "/", schema, "/",
+           new_name, reg_ext, NullS);
+  (void) unpack_filename(new_path, new_path);
+
+  if (my_rename(old_path, new_path, MYF(MY_WME)))
+    return 1;
+
+  /* check if arc_dir exists */
+  strxnmov(arc_path, FN_REFLEN, mysql_data_home, "/", schema, "/arc", NullS);
+  (void) unpack_filename(arc_path, arc_path);
+  
+  if (revision && !access(arc_path, F_OK))
+  {
+    while (revision) {
+      my_snprintf(old_path, FN_REFLEN, "%s/%s%s-%04lu",
+		  arc_path, old_name, reg_ext, (ulong)revision);
+      (void) unpack_filename(old_path, old_path);
+      my_snprintf(new_path, FN_REFLEN, "%s/%s%s-%04lu",
+		  arc_path, new_name, reg_ext, (ulong)revision);
+      (void) unpack_filename(new_path, new_path);
+      if (my_rename(old_path, new_path, MYF(0)))
+        return 0;
+      revision--;
+    }
+  }
+  return 0;
+}
+
+bool
+mysql_rename_view(THD *thd,
+		   const char *new_name,
+           TABLE_LIST *view)
+{
+  LEX_STRING pathstr, file;
+  File_parser *parser;
+  char view_path[FN_REFLEN];
+
+  DBUG_ENTER("mysql_rename_view");
+
+  strxnmov(view_path, FN_REFLEN, mysql_data_home, "/", view->db, "/",
+           view->table_name, reg_ext, NullS);
+  (void) unpack_filename(view_path, view_path);
+
+  pathstr.str= (char *)view_path;
+  pathstr.length= strlen(view_path);
+
+  if ((parser= sql_parse_prepare(&pathstr, thd->mem_root, 1)) && 
+       is_equal(&view_type, parser->type())) {
+    char dir_buff[FN_REFLEN], file_buff[FN_REFLEN];
+
+    /* get view definition and source */
+    if (mysql_make_view(parser, view) ||
+        parser->parse((gptr)view, thd->mem_root,
+                      view_parameters + source_number_position, 1))
+      DBUG_RETURN(1);
+
+    /* rename view and it's backups */
+    if (rename_view_files(view->db, view->table_name, new_name, view->revision - 1))
+      DBUG_RETURN(1);
+
+    strxnmov(dir_buff, FN_REFLEN, mysql_data_home, "/", view->db, "/", NullS);
+    (void) unpack_filename(dir_buff, dir_buff);
+
+    pathstr.str=    (char*)dir_buff;
+    pathstr.length= strlen(dir_buff);
+
+    file.str= file_buff;
+    file.length= (strxnmov(file_buff, FN_REFLEN, new_name, reg_ext, NullS) 
+                  - file_buff);
+
+    if (sql_create_definition_file(&pathstr, &file, view_file_type,
+      (gptr)view, view_parameters, num_view_backups)) {
+      /* restore renamed view in case of error */
+      rename_view_files(view->db, new_name, view->table_name, view->revision - 1);
+      DBUG_RETURN(1);
+    }
+  } else
+    DBUG_RETURN(1);  
+
+  /* remove cache entries */
+  query_cache_invalidate3(thd, view, 0);
+  sp_cache_invalidate();
+  DBUG_RETURN(0);
+}

sql/sql_view.h

@@ -34,6 +34,7 @@ int view_checksum(THD *thd, TABLE_LIST *view);
 extern TYPELIB updatable_views_with_limit_typelib;
 
 bool check_duplicate_names(List<Item>& item_list, bool gen_unique_view_names);
+bool mysql_rename_view(THD *thd, const char *new_name, TABLE_LIST *view);
 
 #define VIEW_ANY_ACL (SELECT_ACL | UPDATE_ACL | INSERT_ACL | DELETE_ACL)