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Merge mysql.com:/home/timka/mysql/src/5.0-virgin

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into  mysql.com:/home/timka/mysql/src/5.0-bug-16710


mysql-test/r/group_min_max.result:
  Auto merged
mysql-test/t/group_min_max.test:
  Auto merged
sql/item.cc:
  Auto merged
sql/item.h:
  Auto merged
sql/opt_range.cc:
  Auto merged
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unknown
2006-03-31 12:39:33 +03:00
parent 86504f8785 a01d48f92e
commit 085aa5c99e
5 changed files with 78 additions and 1 deletions
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26
sql/opt_range.cc
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@ -6895,6 +6895,7 @@ cost_group_min_max(TABLE* table, KEY *index_info, uint used_key_parts,
bool have_min, bool have_max,
double *read_cost, ha_rows *records);
/*
Test if this access method is applicable to a GROUP query with MIN/MAX
functions, and if so, construct a new TRP object.
@ -7301,11 +7302,36 @@ get_best_group_min_max(PARAM *param, SEL_TREE *tree)
}
else if (min_max_arg_part &&
(min_max_arg_part - first_non_group_part > 0))
{
/*
There is a gap but no range tree, thus no predicates at all for the
non-group keyparts.
*/
goto next_index;
}
else if (first_non_group_part && join->conds)
{
/*
If there is no MIN/MAX function in the query, but some index
key part is referenced in the WHERE clause, then this index
cannot be used because the WHERE condition over the keypart's
field cannot be 'pushed' to the index (because there is no
range 'tree'), and the WHERE clause must be evaluated before
GROUP BY/DISTINCT.
*/
/*
Store the first and last keyparts that need to be analyzed
into one array that can be passed as parameter.
*/
KEY_PART_INFO *key_part_range[2];
key_part_range[0]= first_non_group_part;
key_part_range[1]= last_part;
/* Check if cur_part is referenced in the WHERE clause. */
if (join->conds->walk(&Item::find_item_in_field_list_processor,
(byte*) key_part_range))
goto next_index;
}
}
/*