MRR interface: change range_info's type from char* to range_id_t typedef. The goals are:

- cleaner code
- ability to change from using pointers to offsets at some point

6 files changed, 43 insertions, 41 deletions

diff --git a/sql/handler.h b/sql/handler.h
index 23d64681d26..aabb60e4252 100644
--- a/sql/handler.h
+++ b/sql/handler.h
@@ -1218,7 +1218,7 @@ typedef struct st_range_seq_if
           out from the stream of records returned by multi_range_read_next()
       0 - The record shall be left in the stream
   */ 
-  bool (*skip_record) (range_seq_t seq, char *range_info, uchar *rowid);
+  bool (*skip_record) (range_seq_t seq, range_id_t range_info, uchar *rowid);
 
   /*
     Check if the record combination matches the index condition
@@ -1231,10 +1231,10 @@ typedef struct st_range_seq_if
       0 - The record combination satisfies the index condition
       1 - Otherwise
   */ 
-  bool (*skip_index_tuple) (range_seq_t seq, char *range_info);
+  bool (*skip_index_tuple) (range_seq_t seq, range_id_t range_info);
 } RANGE_SEQ_IF;
 
-typedef bool (*SKIP_INDEX_TUPLE_FUNC) (range_seq_t seq, char *range_info);
+typedef bool (*SKIP_INDEX_TUPLE_FUNC) (range_seq_t seq, range_id_t range_info);
 
 class COST_VECT
 { 
@@ -1870,7 +1870,7 @@ public:
   virtual int multi_range_read_init(RANGE_SEQ_IF *seq, void *seq_init_param,
                                     uint n_ranges, uint mode, 
                                     HANDLER_BUFFER *buf);
-  virtual int multi_range_read_next(char **range_info);
+  virtual int multi_range_read_next(range_id_t *range_info);
   virtual int read_range_first(const key_range *start_key,
                                const key_range *end_key,
                                bool eq_range, bool sorted);
diff --git a/sql/multi_range_read.cc b/sql/multi_range_read.cc
index 5a6cb0a99f7..2bea804beef 100644
--- a/sql/multi_range_read.cc
+++ b/sql/multi_range_read.cc
@@ -227,7 +227,7 @@ handler::multi_range_read_init(RANGE_SEQ_IF *seq_funcs, void *seq_init_param,
   @retval other  Error code
 */
 
-int handler::multi_range_read_next(char **range_info)
+int handler::multi_range_read_next(range_id_t *range_info)
 {
   int result= HA_ERR_END_OF_FILE;
   bool range_res;
@@ -306,7 +306,7 @@ int Mrr_simple_index_reader::init(handler *h_arg, RANGE_SEQ_IF *seq_funcs,
 }
 
 
-int Mrr_simple_index_reader::get_next(char **range_info)
+int Mrr_simple_index_reader::get_next(range_id_t *range_info)
 {
   int res;
   while (!(res= file->handler::multi_range_read_next(range_info)))
@@ -338,7 +338,7 @@ int Mrr_simple_index_reader::get_next(char **range_info)
   @retval Other               Some other error; Error is printed
 */
 
-int Mrr_ordered_index_reader::get_next(char **range_info)
+int Mrr_ordered_index_reader::get_next(range_id_t *range_info)
 {
   int res;
   DBUG_ENTER("Mrr_ordered_index_reader::get_next");
@@ -481,7 +481,7 @@ int Mrr_ordered_index_reader::refill_buffer(bool initial)
   buf_manager->reset_buffer_sizes(buf_manager->arg);
   key_buffer->reset();
   key_buffer->setup_writing(keypar.key_size_in_keybuf,
-                            is_mrr_assoc? sizeof(char*) : 0);
+                            is_mrr_assoc? sizeof(range_id_t) : 0);
 
   while (key_buffer->can_write() && 
          !(source_exhausted= mrr_funcs.next(mrr_iter, &cur_range)))
@@ -610,7 +610,7 @@ void Mrr_index_reader::position()
 
 int Mrr_ordered_rndpos_reader::refill_from_index_reader()
 {
-  char *range_info;
+  range_id_t range_info;
   int res;
   DBUG_ENTER("Mrr_ordered_rndpos_reader::refill_from_index_reader");
 
@@ -618,7 +618,7 @@ int Mrr_ordered_rndpos_reader::refill_from_index_reader()
   index_rowid= index_reader->get_rowid_ptr();
   rowid_buffer->reset();
   rowid_buffer->setup_writing(file->ref_length,
-                              is_mrr_assoc? sizeof(char*) : 0);
+                              is_mrr_assoc? sizeof(range_id_t) : 0);
 
   last_identical_rowid= NULL;
 
@@ -648,7 +648,7 @@ int Mrr_ordered_rndpos_reader::refill_from_index_reader()
   rowid_buffer->sort((qsort2_cmp)rowid_cmp_reverse, (void*)file);
 
   rowid_buffer->setup_reading(file->ref_length,
-                              is_mrr_assoc ? sizeof(char*) : 0);
+                              is_mrr_assoc ? sizeof(range_id_t) : 0);
   DBUG_RETURN(rowid_buffer->is_empty()? HA_ERR_END_OF_FILE : 0);
 }
 
@@ -661,7 +661,7 @@ int Mrr_ordered_rndpos_reader::refill_from_index_reader()
     with the same rowid value.
 */
 
-int Mrr_ordered_rndpos_reader::get_next(char **range_info)
+int Mrr_ordered_rndpos_reader::get_next(range_id_t *range_info)
 {
   int res;
   
@@ -684,8 +684,8 @@ int Mrr_ordered_rndpos_reader::get_next(char **range_info)
     if (!is_mrr_assoc)
       return 0;
 
-    memcpy(range_info, rowid_buffer->read_ptr2, sizeof(uchar*));
-    if (!index_reader->skip_record((char*)*range_info, rowid_buffer->read_ptr1))
+    memcpy(range_info, rowid_buffer->read_ptr2, sizeof(range_id_t));
+    if (!index_reader->skip_record(*range_info, rowid_buffer->read_ptr1))
       return 0;
   }
   
@@ -701,7 +701,7 @@ int Mrr_ordered_rndpos_reader::get_next(char **range_info)
 
     if (is_mrr_assoc)
     {
-      memcpy(range_info, rowid_buffer->read_ptr2, sizeof(uchar*));
+      memcpy(range_info, rowid_buffer->read_ptr2, sizeof(range_id_t));
       if (index_reader->skip_record(*range_info, rowid_buffer->read_ptr1))
         continue;
     }
@@ -899,7 +899,7 @@ int DsMrr_impl::dsmrr_init(handler *h_arg, RANGE_SEQ_IF *seq_funcs,
       /* index strategy doesn't need buffer, give all space to rowids*/
       rowid_buffer.set_buffer_space(full_buf, full_buf_end);
       if (!rowid_buffer.have_space_for(primary_file->ref_length + 
-                                       (int)is_mrr_assoc * sizeof(char*)))
+                                       (int)is_mrr_assoc * sizeof(range_id_t)))
         goto use_default_impl;
     }
 
@@ -1139,7 +1139,7 @@ bool DsMrr_impl::setup_buffer_sharing(uint key_size_in_keybuf,
                                       key_part_map key_tuple_map)
 {
   long key_buff_elem_size= key_size_in_keybuf + 
-                           (int)is_mrr_assoc * sizeof(void*);
+                           (int)is_mrr_assoc * sizeof(range_id_t);
   
   KEY *key_info= &primary_file->get_table()->key_info[keyno];
   /* 
@@ -1147,7 +1147,7 @@ bool DsMrr_impl::setup_buffer_sharing(uint key_size_in_keybuf,
     for keys and another part for rowids.
   */
   ulonglong rowid_buf_elem_size= primary_file->ref_length + 
-                                 (int)is_mrr_assoc * sizeof(char*);
+                                 (int)is_mrr_assoc * sizeof(range_id_t);
   
   /*
     Use rec_per_key statistics as a basis to find out how many rowids 
@@ -1284,7 +1284,7 @@ int Key_value_records_iterator::init(Mrr_ordered_index_reader *owner_arg)
 }
 
 
-int Key_value_records_iterator::get_next(char **range_info)
+int Key_value_records_iterator::get_next(range_id_t *range_info)
 {
   int res;
 
@@ -1310,7 +1310,7 @@ int Key_value_records_iterator::get_next(char **range_info)
   }
 
   identical_key_it.read(); /* This gets us next range_id */
-  memcpy(range_info, identical_key_it.read_ptr2, sizeof(char*));
+  memcpy(range_info, identical_key_it.read_ptr2, sizeof(range_id_t));
 
   if (!last_identical_key_ptr || 
       (identical_key_it.read_ptr1 == last_identical_key_ptr))
@@ -1339,7 +1339,7 @@ void Key_value_records_iterator::move_to_next_key_value()
   Calling convention is like multi_range_read_next() has.
 */
 
-int DsMrr_impl::dsmrr_next(char **range_info)
+int DsMrr_impl::dsmrr_next(range_id_t *range_info)
 {
   int res;
   if (strategy_exhausted)
diff --git a/sql/multi_range_read.h b/sql/multi_range_read.h
index fe33d2a4093..08ac1b6f6a4 100644
--- a/sql/multi_range_read.h
+++ b/sql/multi_range_read.h
@@ -135,7 +135,7 @@ class Key_value_records_iterator
   
 public:
   int init(Mrr_ordered_index_reader *owner_arg);
-  int get_next(char **range_info);
+  int get_next(range_id_t *range_info);
   void move_to_next_key_value();
 };
 
@@ -186,7 +186,7 @@ public:
 class Mrr_reader 
 {
 public:
-  virtual int get_next(char **range_info) = 0;
+  virtual int get_next(range_id_t *range_info) = 0;
   virtual int refill_buffer(bool initial) = 0;
   virtual ~Mrr_reader() {}; /* just to remove compiler warning */
 };
@@ -211,7 +211,7 @@ public:
   virtual uchar *get_rowid_ptr() = 0;
   /* Get the rowid (call this after get_next() call) */
   virtual void position();
-  virtual bool skip_record(char *range_id, uchar *rowid) = 0;
+  virtual bool skip_record(range_id_t range_id, uchar *rowid) = 0;
 
   virtual void interrupt_read() {}
   virtual void resume_read() {}
@@ -232,10 +232,10 @@ public:
            uint mode, Key_parameters *key_par,
            Lifo_buffer *key_buffer,
            Buffer_manager *buf_manager_arg);
-  int get_next(char **range_info);
+  int get_next(range_id_t *range_info);
   int refill_buffer(bool initial) { return initial? 0: HA_ERR_END_OF_FILE; }
   uchar *get_rowid_ptr() { return file->ref; }
-  bool skip_record(char *range_id, uchar *rowid)
+  bool skip_record(range_id_t range_id, uchar *rowid)
   {
     return (file->mrr_funcs.skip_record &&
             file->mrr_funcs.skip_record(file->mrr_iter, range_id, rowid));
@@ -255,17 +255,17 @@ public:
            uint mode, Key_parameters *key_par,
            Lifo_buffer *key_buffer,
            Buffer_manager *buf_manager_arg);
-  int get_next(char **range_info);
+  int get_next(range_id_t *range_info);
   int refill_buffer(bool initial);
   uchar *get_rowid_ptr() { return file->ref; }
   
-  bool skip_record(char *range_info, uchar *rowid)
+  bool skip_record(range_id_t range_info, uchar *rowid)
   {
     return (mrr_funcs.skip_record &&
             mrr_funcs.skip_record(mrr_iter, range_info, rowid));
   }
 
-  bool skip_index_tuple(char *range_info)
+  bool skip_index_tuple(range_id_t range_info)
   {
     return (mrr_funcs.skip_index_tuple &&
             mrr_funcs.skip_index_tuple(mrr_iter, range_info));
@@ -343,7 +343,7 @@ class Mrr_ordered_rndpos_reader : public Mrr_reader
 public:
   int init(handler *file, Mrr_index_reader *index_reader, uint mode,
            Lifo_buffer *buf);
-  int get_next(char **range_info);
+  int get_next(range_id_t *range_info);
   int refill_buffer(bool initial);
 private:
   handler *file; /* Handler to use */
@@ -540,7 +540,7 @@ public:
                  void *seq_init_param, uint n_ranges, uint mode, 
                  HANDLER_BUFFER *buf);
   void dsmrr_close();
-  int dsmrr_next(char **range_info);
+  int dsmrr_next(range_id_t *range_info);
 
   ha_rows dsmrr_info(uint keyno, uint n_ranges, uint keys, uint key_parts, 
                      uint *bufsz, uint *flags, COST_VECT *cost);
diff --git a/sql/opt_range.cc b/sql/opt_range.cc
index 6481d3f6f7d..f8618c0722d 100644
--- a/sql/opt_range.cc
+++ b/sql/opt_range.cc
@@ -10519,7 +10519,7 @@ int QUICK_RANGE_SELECT::reset()
 
 int QUICK_RANGE_SELECT::get_next()
 {
-  char *dummy;
+  range_id_t dummy;
   DBUG_ENTER("QUICK_RANGE_SELECT::get_next");
   if (in_ror_merged_scan)
   {
diff --git a/sql/sql_join_cache.cc b/sql/sql_join_cache.cc
index d04f5eddfa8..e952cf3e2ef 100644
--- a/sql/sql_join_cache.cc
+++ b/sql/sql_join_cache.cc
@@ -3712,7 +3712,9 @@ int JOIN_TAB_SCAN_MRR::open()
 int JOIN_TAB_SCAN_MRR::next()
 {
   char **ptr= (char **) cache->get_curr_association_ptr();
-  int rc= join_tab->table->file->multi_range_read_next(ptr) ? -1 : 0;
+
+  DBUG_ASSERT(sizeof(range_id_t) == sizeof(*ptr));
+  int rc= join_tab->table->file->multi_range_read_next((range_id_t*)ptr) ? -1 : 0;
   if (!rc)
   {
     /* 
@@ -3836,7 +3838,7 @@ bool bka_range_seq_next(range_seq_t rseq, KEY_MULTI_RANGE *range)
 */ 
 
 static 
-bool bka_range_seq_skip_record(range_seq_t rseq, char *range_info, uchar *rowid)
+bool bka_range_seq_skip_record(range_seq_t rseq, range_id_t range_info, uchar *rowid)
 {
   DBUG_ENTER("bka_range_seq_skip_record");
   JOIN_CACHE_BKA *cache= (JOIN_CACHE_BKA *) rseq;
@@ -3867,7 +3869,7 @@ bool bka_range_seq_skip_record(range_seq_t rseq, char *range_info, uchar *rowid)
 */
 
 static 
-bool bka_skip_index_tuple(range_seq_t rseq, char *range_info)
+bool bka_skip_index_tuple(range_seq_t rseq, range_id_t range_info)
 {
   DBUG_ENTER("bka_skip_index_tuple");
   JOIN_CACHE_BKA *cache= (JOIN_CACHE_BKA *) rseq;
@@ -4203,7 +4205,7 @@ start:
     0    otherwise
 */
 
-bool JOIN_CACHE_BKA::skip_index_tuple(char *range_info)
+bool JOIN_CACHE_BKA::skip_index_tuple(range_id_t range_info)
 {
   DBUG_ENTER("JOIN_CACHE_BKA::skip_index_tuple");
   get_record_by_pos((uchar*)range_info);
@@ -4311,7 +4313,7 @@ bool bkah_range_seq_next(range_seq_t rseq, KEY_MULTI_RANGE *range)
 */ 
 
 static 
-bool bkah_range_seq_skip_record(range_seq_t rseq, char *range_info,
+bool bkah_range_seq_skip_record(range_seq_t rseq, range_id_t range_info,
                                 uchar *rowid)
 {
   DBUG_ENTER("bkah_range_seq_skip_record");
@@ -4342,7 +4344,7 @@ bool bkah_range_seq_skip_record(range_seq_t rseq, char *range_info,
 */
 
 static 
-bool bkah_skip_index_tuple(range_seq_t rseq, char *range_info)
+bool bkah_skip_index_tuple(range_seq_t rseq, range_id_t range_info)
 {
   DBUG_ENTER("bka_unique_skip_index_tuple");
   JOIN_CACHE_BKAH *cache= (JOIN_CACHE_BKAH *) rseq;
@@ -4456,7 +4458,7 @@ int JOIN_CACHE_BKAH::init()
 
 */
 
-bool JOIN_CACHE_BKAH::skip_index_tuple(char *range_info)
+bool JOIN_CACHE_BKAH::skip_index_tuple(range_id_t range_info)
 {
   uchar *last_rec_ref_ptr= get_next_rec_ref((uchar*) range_info);
   uchar *next_rec_ref_ptr= last_rec_ref_ptr;
diff --git a/sql/sql_join_cache.h b/sql/sql_join_cache.h
index 2d7c090e778..5498192122f 100644
--- a/sql/sql_join_cache.h
+++ b/sql/sql_join_cache.h
@@ -1313,7 +1313,7 @@ public:
   uint get_next_key(uchar **key);
 
   /* Check index condition of the joined table for a record from BKA cache */
-  bool skip_index_tuple(char *range_info);
+  bool skip_index_tuple(range_id_t range_info);
 
 };
 
@@ -1403,5 +1403,5 @@ public:
   enum Join_algorithm get_join_alg() { return BKAH_JOIN_ALG; }
 
   /* Check index condition of the joined table for a record from BKAH cache */
-  bool skip_index_tuple(char *range_info);
+  bool skip_index_tuple(range_id_t range_info);
 };