Table definition cache, part 2

The table opening process now works the following way:
- Create common TABLE_SHARE object
- Read the .frm file and unpack it into the TABLE_SHARE object
- Create a TABLE object based on the information in the TABLE_SHARE
  object and open a handler to the table object

Other noteworthy changes:
- In TABLE_SHARE the most common strings are now LEX_STRING's
- Better error message when table is not found
- Variable table_cache is now renamed 'table_open_cache'
- New variable 'table_definition_cache' that is the number of table defintions that will be cached
- strxnmov() calls are now fixed to avoid overflows
- strxnmov() will now always add one end \0 to result
- engine objects are now created with a TABLE_SHARE object instead of a TABLE object.
- After creating a field object one must call field->init(table) before using it

- For a busy system this change will give you:
 - Less memory usage for table object
 - Faster opening of tables (if it's has been in use or is in table definition cache)
 - Allow you to cache many table definitions objects
 - Faster drop of table

1 files changed, 12 insertions, 0 deletions

diff --git a/mysql-test/valgrind.supp b/mysql-test/valgrind.supp
index 7737810653d..bcca7c252ab 100644
--- a/mysql-test/valgrind.supp
+++ b/mysql-test/valgrind.supp
@@ -152,3 +152,15 @@
    obj:*/libz.so.*
    fun:gzflush
 }
+
+#
+# Warning from my_thread_init becasue mysqld dies before kill thread exists
+#
+
+{
+   my_thread_init kill thread memory loss second
+   Memcheck:Leak
+   fun:calloc
+   fun:my_thread_init
+   fun:kill_server_thread
+}