Improved storage size for Item, Field and some other classes

- Changed order of class fields to remove dead alignment space.
- Changed bool fields in Item to bit fields.
- Used packed enum's for some fields in common classes
- Removed not used Item::rsize.
- Changed some class variables from uint/int to smaller type int's.
- Ensured that field_index is uint16 in all classes and functions. Fixed
  also that we proparly compare with NO_CACHED_FIELD_INDEX when checking
  if variable is not set.
- Removed checking of highest bit of unireg_check (has not been used in
  a long time)
- Fixed wrong arguments to make_cond_for_table() for join_tab_idx_arg
  from false to 0.

One of the result was reducing the size if class Item with ~24 bytes

1 files changed, 2 insertions, 2 deletions

diff --git a/sql/sql_base.h b/sql/sql_base.h
index 922c61ca123..7a56d95bf2a 100644
--- a/sql/sql_base.h
+++ b/sql/sql_base.h
@@ -205,11 +205,11 @@ find_field_in_table_ref(THD *thd, TABLE_LIST *table_list,
                         const char *table_name,
                         ignored_tables_list_t ignored_tables,
                         Item **ref, bool check_privileges, bool allow_rowid,
-                        uint *cached_field_index_ptr,
+                        uint16 *cached_field_index_ptr,
                         bool register_tree_change, TABLE_LIST **actual_table);
 Field *
 find_field_in_table(THD *thd, TABLE *table, const char *name, size_t length,
-                    bool allow_rowid, uint *cached_field_index_ptr);
+                    bool allow_rowid, uint16 *cached_field_index_ptr);
 Field *
 find_field_in_table_sef(TABLE *table, const char *name);
 Item ** find_item_in_list(Item *item, List<Item> &items, uint *counter,