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Ported WL#3220 to mysql-next-mr.

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This commit is contained in:
Georgi Kodinov
2009-09-28 10:21:25 +03:00
parent b21cd91780
commit 7aa8cd7a11
14 changed files with 1620 additions and 882 deletions
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17
sql/opt_range.h
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@ -616,6 +616,7 @@ private:
uchar *last_prefix; /* Prefix of the last group for detecting EOF. */
bool have_min; /* Specify whether we are computing */
bool have_max; /* a MIN, a MAX, or both. */
bool have_agg_distinct;/* aggregate_function(DISTINCT ...). */
bool seen_first_key; /* Denotes whether the first key was retrieved.*/
KEY_PART_INFO *min_max_arg_part; /* The keypart of the only argument field */
/* of all MIN/MAX functions. */
@ -629,6 +630,11 @@ private:
List<Item_sum> *max_functions;
List_iterator<Item_sum> *min_functions_it;
List_iterator<Item_sum> *max_functions_it;
/*
Use index scan to get the next different key instead of jumping into it
through index read
*/
bool is_index_scan;
public:
/*
The following two members are public to allow easy access from
@ -646,12 +652,13 @@ private:
void update_max_result();
public:
QUICK_GROUP_MIN_MAX_SELECT(TABLE *table, JOIN *join, bool have_min,
bool have_max, KEY_PART_INFO *min_max_arg_part,
bool have_max, bool have_agg_distinct,
KEY_PART_INFO *min_max_arg_part,
uint group_prefix_len, uint group_key_parts,
uint used_key_parts, KEY *index_info, uint
use_index, double read_cost, ha_rows records, uint
key_infix_len, uchar *key_infix, MEM_ROOT
*parent_alloc);
*parent_alloc, bool is_index_scan);
~QUICK_GROUP_MIN_MAX_SELECT();
bool add_range(SEL_ARG *sel_range);
void update_key_stat();
@ -667,6 +674,12 @@ public:
#ifndef DBUG_OFF
void dbug_dump(int indent, bool verbose);
#endif
bool is_agg_distinct() { return have_agg_distinct; }
virtual void append_loose_scan_type(String *str)
{
if (is_index_scan)
str->append(STRING_WITH_LEN(" (scanning)"));
}
};