WL#2126 - Multi_read_range.

Added the required structures and functions for
handing over multiple key ranges to the table handler.


include/my_base.h:
  WL#2126 - Multi_read_range.
  Moved key range flags from sql/opt_range.h to here.
  Added the multi-range structure.
sql/handler.cc:
  WL#2126 - Multi_read_range.
  Added the new table handler methods.
sql/handler.h:
  WL#2126 - Multi_read_range.
  Added a new table flag.
  Added a declaration for the handler buffer.
  Added new elements to class handler.
  Added new function declarations.
sql/mysqld.cc:
  WL#2126 - Multi_read_range.
  Added an option to set new system variable 'multi_range_count'.
sql/opt_range.cc:
  WL#2126 - Multi_read_range.
  Added initialization for the new class members.
  Added initialization for the extended get_next().
  Added de-initialization for the allocated buffers.
  Added a buffer allocation method.
  Added an inner loop to collect multiple ranges.
  Adapted range collection loops to the new initialization.
sql/opt_range.h:
  WL#2126 - Multi_read_range.
  Moved key range flags from here to include/my_base.h.
  Added new elements to class QUICK_RANGE_SELECT.
  Added a copy constructor.
sql/records.cc:
  WL#2126 - Multi_read_range.
  Added a call of the allocation method.
sql/set_var.cc:
  WL#2126 - Multi_read_range.
  Added the new system variable 'multi_range_count'.
sql/sql_class.h:
  WL#2126 - Multi_read_range.
  Added the new system variable 'multi_range_count'.

1 files changed, 17 insertions, 0 deletions

diff --git a/include/my_base.h b/include/my_base.h
index 4d043cf6b5b..d219cdd4289 100644
--- a/include/my_base.h
+++ b/include/my_base.h
@@ -370,6 +370,15 @@ enum data_file_type {
 
 /* For key ranges */
 
+#define NO_MIN_RANGE	1
+#define NO_MAX_RANGE	2
+#define NEAR_MIN	4
+#define NEAR_MAX	8
+#define UNIQUE_RANGE	16
+#define EQ_RANGE	32
+#define NULL_RANGE	64
+#define GEOM_FLAG      128
+
 typedef struct st_key_range
 {
   const byte *key;
@@ -377,6 +386,14 @@ typedef struct st_key_range
   enum ha_rkey_function flag;
 } key_range;
 
+typedef struct st_key_multi_range
+{
+  key_range start_key;
+  key_range end_key;
+  char  *ptr;                 /* Free to use by caller (ptr to row etc) */
+  uint  range_flag;           /* key range flags see above */
+} KEY_MULTI_RANGE;
+
 
 /* For number of records */
 #ifdef BIG_TABLES