Added a new parameter for the function eq_ranges_exceeds_limit()

introduced in the patch fo MDEV-16934.

Author: igorbabaev

sql/multi_range_read.cc

@@ -64,13 +64,15 @@ handler::multi_range_read_info_const(uint keyno, RANGE_SEQ_IF *seq,
   ha_rows rows, total_rows= 0;
   uint n_ranges=0;
   THD *thd= table->in_use;
+  uint limit= thd->variables.eq_range_index_dive_limit;
 
+  bool use_statistics_for_eq_range= eq_ranges_exceeds_limit(seq,
+                                                            seq_init_param,
+                                                            limit);
+
   /* Default MRR implementation doesn't need buffer */
   *bufsz= 0;
 
-  bool use_statistics_for_eq_range= eq_ranges_exceeds_limit(seq,
-                                                            seq_init_param);
-
   seq_it= seq->init(seq_init_param, n_ranges, *flags);
   while (!seq->next(seq_it, &range))
   {

sql/opt_range.cc

@@ -14619,13 +14619,12 @@ void QUICK_GROUP_MIN_MAX_SELECT::add_keys_and_lengths(String *key_names,
 
 /* Check whether the number for equality ranges exceeds the set threshold */ 
 
-bool eq_ranges_exceeds_limit(RANGE_SEQ_IF *seq, void *seq_init_param)
+bool eq_ranges_exceeds_limit(RANGE_SEQ_IF *seq, void *seq_init_param,
+                             uint limit)
 {
   KEY_MULTI_RANGE range;
   range_seq_t seq_it;
   uint count = 0;
-  PARAM *param= ((SEL_ARG_RANGE_SEQ*) seq_init_param)->param;
-  uint limit= param->thd->variables.eq_range_index_dive_limit;
 
   if (limit == 0)
   {

sql/opt_range.h

@@ -1664,7 +1664,8 @@ SQL_SELECT *make_select(TABLE *head, table_map const_tables,
 
 bool calculate_cond_selectivity_for_table(THD *thd, TABLE *table, Item **cond);
 
-bool eq_ranges_exceeds_limit(RANGE_SEQ_IF *seq, void *seq_init_param);
+bool eq_ranges_exceeds_limit(RANGE_SEQ_IF *seq, void *seq_init_param,
+                             uint limit);
 
 #ifdef WITH_PARTITION_STORAGE_ENGINE
 bool prune_partitions(THD *thd, TABLE *table, Item *pprune_cond);