Implementation of the MWL#247: Make the optimizer use extended keys.

The main patch.
.

1 files changed, 3 insertions, 0 deletions

diff --git a/sql/structs.h b/sql/structs.h
index 18f90d5b8b1..be53a88a0cc 100644
--- a/sql/structs.h
+++ b/sql/structs.h
@@ -77,6 +77,9 @@ typedef struct st_key {
   ulong flags;                          /* dupp key and pack flags */
   uint	key_parts;			/* How many key_parts */
   uint	usable_key_parts;		/* Should normally be = key_parts */
+  uint ext_key_parts;              /* Number of key parts in extended key */
+  ulong ext_key_flags;             /* Flags for extended key              */
+  key_part_map ext_key_part_map;   /* Bitmap of pk key parts in extension */ 
   uint  block_size;
   uint  name_length;
   enum  ha_key_alg algorithm;