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MDEV-10175: range optimizer calls records_in_range() for full extended keys

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Make the range optimizer not call records_in_range() when it would
not give any benefit.
This commit is contained in:
Sergei Petrunia 2016-06-03 14:43:08 +03:00
parent 825427fa9f
commit 1859caf60b
1 changed files with 21 additions and 5 deletions
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26
sql/opt_range_mrr.cc
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@ -266,12 +266,28 @@ walk_up_n_right:
range->end_key.flag= (cur->max_key_flag & NEAR_MAX ? HA_READ_BEFORE_KEY :
HA_READ_AFTER_KEY);
range->end_key.keypart_map= make_prev_keypart_map(cur->max_key_parts);
KEY *key_info;
if (seq->real_keyno== MAX_KEY)
key_info= NULL;
else
key_info= &seq->param->table->key_info[seq->real_keyno];
/*
Conditions below:
(1) - range analysis is used for estimating condition selectivity
(2) - This is a unique key, and we have conditions for all its
user-defined key parts.
(3) - The table uses extended keys, and we have conditions for
all key parts.
*/
if (!(cur->min_key_flag & ~NULL_RANGE) && !cur->max_key_flag &&
(seq->real_keyno == MAX_KEY ||
((uint)key_tree->part+1 ==
seq->param->table->key_info[seq->real_keyno].user_defined_key_parts &&
(seq->param->table->key_info[seq->real_keyno].flags & HA_NOSAME))) &&
(!key_info || // (1)
((uint)key_tree->part+1 == key_info->user_defined_key_parts && // (2)
key_info->flags & HA_NOSAME) || // (2)
(seq->param->table->s->use_ext_keys && // (3)
(uint)key_tree->part+1 == key_info->ext_key_parts) // (3)
) &&
range->start_key.length == range->end_key.length &&
!memcmp(seq->param->min_key,seq->param->max_key,range->start_key.length))
range->range_flag= UNIQUE_RANGE | (cur->min_key_flag & NULL_RANGE);