MWL#121-125 DS-MRR improvements

- Address review feedback: change return type of RANGE_SEQ_IF::next()

sql/handler.h

@@ -1197,10 +1197,10 @@ typedef struct st_range_seq_if
         range  OUT Information about the next range
     
     RETURN
-      0 - Ok, the range structure filled with info about the next range
-      1 - No more ranges
+      FALSE - Ok, the range structure filled with info about the next range
+      TRUE  - No more ranges
   */
-  uint (*next) (range_seq_t seq, KEY_MULTI_RANGE *range);
+  bool (*next) (range_seq_t seq, KEY_MULTI_RANGE *range);
 
   /*
     Check whether range_info orders to skip the next record

sql/multi_range_read.cc

@@ -426,17 +426,14 @@ int Mrr_ordered_index_reader::refill_buffer(bool initial)
   if (source_exhausted)
     DBUG_RETURN(HA_ERR_END_OF_FILE);
 
-  //if (know_key_tuple_params)
-  {
   buf_manager->reset_buffer_sizes(buf_manager->arg);
   key_buffer->reset();
   key_buffer->setup_writing(&key_ptr, keypar.key_size_in_keybuf,
                             is_mrr_assoc? (uchar**)&range_info_ptr : NULL,
                             sizeof(uchar*));
-  }
 
   while (key_buffer->can_write() && 
-         !(source_exhausted= (bool)mrr_funcs.next(mrr_iter, &cur_range)))
+         !(source_exhausted= mrr_funcs.next(mrr_iter, &cur_range)))
   {
     DBUG_ASSERT(cur_range.range_flag & EQ_RANGE);
 

sql/opt_range.h

@@ -373,7 +373,7 @@ typedef struct st_quick_range_seq_ctx
 } QUICK_RANGE_SEQ_CTX;
 
 range_seq_t quick_range_seq_init(void *init_param, uint n_ranges, uint flags);
-uint quick_range_seq_next(range_seq_t rseq, KEY_MULTI_RANGE *range);
+bool quick_range_seq_next(range_seq_t rseq, KEY_MULTI_RANGE *range);
 
 
 /*
@@ -461,7 +461,7 @@ class QUICK_RANGE_SELECT : public QUICK_SELECT_I
   friend class QUICK_INDEX_MERGE_SELECT;
   friend class QUICK_ROR_INTERSECT_SELECT;
   friend class QUICK_GROUP_MIN_MAX_SELECT;
-  friend uint quick_range_seq_next(range_seq_t rseq, KEY_MULTI_RANGE *range);
+  friend bool quick_range_seq_next(range_seq_t rseq, KEY_MULTI_RANGE *range);
   friend range_seq_t quick_range_seq_init(void *init_param,
                                           uint n_ranges, uint flags);
 };

sql/opt_range_mrr.cc

@@ -116,11 +116,11 @@ static void step_down_to(SEL_ARG_RANGE_SEQ *arg, SEL_ARG *key_tree)
       - max_key_part
 
   RETURN
-    0  Ok
-    1  No more ranges in the sequence
+    FALSE  Ok
+    TRUE   No more ranges in the sequence
 */
 
-uint sel_arg_range_seq_next(range_seq_t rseq, KEY_MULTI_RANGE *range)
+bool sel_arg_range_seq_next(range_seq_t rseq, KEY_MULTI_RANGE *range)
 {
   SEL_ARG *key_tree;
   SEL_ARG_RANGE_SEQ *seq= (SEL_ARG_RANGE_SEQ*)rseq;
@@ -314,7 +314,7 @@ range_seq_t quick_range_seq_init(void *init_param, uint n_ranges, uint flags)
     1  No more ranges in the sequence
 */
 
-uint quick_range_seq_next(range_seq_t rseq, KEY_MULTI_RANGE *range)
+bool quick_range_seq_next(range_seq_t rseq, KEY_MULTI_RANGE *range)
 {
   QUICK_RANGE_SEQ_CTX *ctx= (QUICK_RANGE_SEQ_CTX*)rseq;
 

sql/sql_join_cache.cc

@@ -3655,12 +3655,12 @@ range_seq_t bka_range_seq_init(void *init_param, uint n_ranges, uint flags)
     This function are used only as a callback function.
    
   RETURN VALUE
-    0   ok, the range structure filled with info about the next range/key
-    1   no more ranges
+    FALSE   ok, the range structure filled with info about the next range/key
+    TRUE    no more ranges
 */    
 
 static 
-uint bka_range_seq_next(range_seq_t rseq, KEY_MULTI_RANGE *range)
+bool bka_range_seq_next(range_seq_t rseq, KEY_MULTI_RANGE *range)
 {
   DBUG_ENTER("bka_range_seq_next");
   JOIN_CACHE_BKA *cache= (JOIN_CACHE_BKA *) rseq;
@@ -4130,12 +4130,12 @@ range_seq_t bkah_range_seq_init(void *init_param, uint n_ranges, uint flags)
     This function are used only as a callback function.
    
   RETURN VALUE
-    0    ok, the range structure filled with info about the next range/key
-    1    no more ranges
+    FALSE  ok, the range structure filled with info about the next range/key
+    TRUE   no more ranges
 */    
 
 static 
-uint bkah_range_seq_next(range_seq_t rseq, KEY_MULTI_RANGE *range)
+bool bkah_range_seq_next(range_seq_t rseq, KEY_MULTI_RANGE *range)
 {
   DBUG_ENTER("bkah_range_seq_next");
   JOIN_CACHE_BKAH *cache= (JOIN_CACHE_BKAH *) rseq;