merge with work

mysql-test/r/fulltext.result:
  Auto merged
mysql-test/r/innodb.result:
  Auto merged
mysql-test/r/merge.result:
  Auto merged
sql/item_func.cc:
  Auto merged
sql/item_func.h:
  Auto merged
sql/item_strfunc.cc:
  Auto merged
sql/item_strfunc.h:
  Auto merged
sql/opt_range.cc:
  Auto merged
sql/share/czech/errmsg.txt:
  Auto merged
sql/share/danish/errmsg.txt:
  Auto merged
sql/share/dutch/errmsg.txt:
  Auto merged
sql/share/estonian/errmsg.txt:
  Auto merged
sql/share/french/errmsg.txt:
  Auto merged
sql/share/greek/errmsg.txt:
  Auto merged
sql/share/hungarian/errmsg.txt:
  Auto merged
sql/share/italian/errmsg.txt:
  Auto merged
sql/sql_base.cc:
  Auto merged
sql/sql_cache.cc:
  Auto merged
sql/sql_class.h:
  Auto merged
sql/sql_show.cc:
  Auto merged
sql/share/japanese/errmsg.txt:
  Auto merged
sql/share/korean/errmsg.txt:
  Auto merged
sql/share/norwegian-ny/errmsg.txt:
  Auto merged
sql/share/norwegian/errmsg.txt:
  Auto merged
sql/share/polish/errmsg.txt:
  Auto merged
sql/share/portuguese/errmsg.txt:
  Auto merged
sql/share/romanian/errmsg.txt:
  Auto merged
sql/share/slovak/errmsg.txt:
  Auto merged
sql/share/spanish/errmsg.txt:
  Auto merged
sql/share/swedish/errmsg.txt:
  Auto merged
myisam/rt_test.c:
  Merge
myisam/sp_key.c:
  Merge
myisam/sp_test.c:
  Merge
mysql-test/r/create.result:
  Merge
sql/share/english/errmsg.txt:
  Merge
sql/sql_yacc.yy:
  Merge

1 files changed, 15 insertions, 0 deletions

diff --git a/sql/sql_cache.cc b/sql/sql_cache.cc
index 26fa0bb0481..f14230913c7 100644
--- a/sql/sql_cache.cc
+++ b/sql/sql_cache.cc
@@ -278,6 +278,21 @@ TODO list:
   - Move MRG_MYISAM table type processing to handlers, something like:
         tables_used->table->file->register_used_filenames(callback,
                                                           first_argument);
+  - Make derived tables cachable.
+  - QC improvement suggested by Monty:
+    - Add a counter in open_table() for how many MERGE (ISAM or MyISAM)
+      tables are cached in the table cache.
+      (This will be trivial when we have the new table cache in place I
+      have been working on)
+    - After this we can add the following test around the for loop in
+      is_cacheable::
+
+      if (thd->temp_tables || global_merge_table_count)
+
+    - Another option would be to set thd->safe_to_cache_query to 0
+      in 'get_lock_data' if any of the tables was a tmp table or a
+      MRG_ISAM table.
+      (This could be done with almost no speed penalty)
 */
 
 #include "mysql_priv.h"