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, 3 insertions, 3 deletions

diff --git a/sql/sql_base.cc b/sql/sql_base.cc
index 7b61f750359..583903509a6 100644
--- a/sql/sql_base.cc
+++ b/sql/sql_base.cc
@@ -6014,10 +6014,10 @@ find_field_in_natural_join(THD *thd, TABLE_LIST *table_ref, const char *name, si
 
 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 *field;
-  uint cached_field_index= *cached_field_index_ptr;
+  uint16 cached_field_index= *cached_field_index_ptr;
   DBUG_ENTER("find_field_in_table");
   DBUG_PRINT("enter", ("table: '%s', field name: '%s'", table->alias.c_ptr(),
                        name));
@@ -6113,7 +6113,7 @@ find_field_in_table_ref(THD *thd, TABLE_LIST *table_list,
                         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 *fld;