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Added a new parameter for the function eq_ranges_exceeds_limit()

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introduced in the patch fo MDEV-16934.
This commit is contained in:
Igor Babaev 2018-08-24 20:53:00 -07:00
parent 8b949d961c
commit c826b6b8da
3 changed files with 9 additions and 7 deletions
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8
sql/multi_range_read.cc
View file

@ -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))
{

5
sql/opt_range.cc
View file

@ -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)
{

3
sql/opt_range.h
View file

@ -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);