database/mariadb
1
0
Fork 0
mirror of https://github.com/MariaDB/server.git synced 2025-07-30 16:24:05 +03:00
Code Activity

WL#1562 (Improving spatial code)

Browse Source 
A set of changes improving our RTree indexes and fixed few bugs
found during the tests


myisam/rt_index.c:
  Algorythm for picking the branch to insert was fixed.
  pick_by_perimeter version of the algorythm added (mostly for testing
  purposes)
myisam/rt_index.h:
  minimal size of the page set to 1/3
  It noticeable increases searching performance
myisam/rt_key.c:
  counting of the size of the filled part of the page fixed
  rtree_choose_key moved to rt_index.c
myisam/rt_key.h:
  no need to make rtree_choose_key global
myisam/rt_mbr.c:
  operations for counting the perimeter of MBR added
myisam/rt_mbr.h:
  interface for rtree_perimeter_increase
myisam/rt_split.c:
  my_multi_malloc changed with my_alloca
sql/spatial.cc:
  LINESTRING object can consist of single point
This commit is contained in:
unknown
2004-05-25 15:06:32 +05:00
parent de861db3e7
commit c690204c70
8 changed files with 207 additions and 57 deletions
Download Patch File Download Diff File Expand all files Collapse all files

46
myisam/rt_key.c
View File

@ -35,7 +35,8 @@ int rtree_add_key(MI_INFO *info, MI_KEYDEF *keyinfo, uchar *key,
uint page_size = mi_getint(page_buf);
uint nod_flag = mi_test_if_nod(page_buf);
if (page_size + key_length + nod_flag <= keyinfo->block_length)
if (page_size + key_length + info->s->base.rec_reflength <=
keyinfo->block_length)
{
/* split won't be necessary */
if (nod_flag)
@ -94,46 +95,3 @@ int rtree_set_key_mbr(MI_INFO *info, MI_KEYDEF *keyinfo, uchar *key,
return rtree_page_mbr(info, keyinfo->seg, info->buff, key, key_length);
}
/*
Choose non-leaf better key for insertion
*/
uchar *rtree_choose_key(MI_INFO *info, MI_KEYDEF *keyinfo, uchar *key,
uint key_length, uchar *page_buf, uint nod_flag)
{
double increase;
double best_incr = DBL_MAX;
double area;
double best_area;
uchar *best_key;
uchar *k = rt_PAGE_FIRST_KEY(page_buf, nod_flag);
uchar *last = rt_PAGE_END(page_buf);
LINT_INIT(best_area);
LINT_INIT(best_key);
for (; k < last; k = rt_PAGE_NEXT_KEY(k, key_length, nod_flag))
{
if ((increase = rtree_area_increase(keyinfo->seg, key, k, key_length,
&area)) == -1)
return NULL;
if (increase < best_incr)
{
best_key = k;
best_area = area;
best_incr = increase;
}
else
{
if ((increase == best_incr) && (area < best_area))
{
best_key = k;
best_area = area;
best_incr = increase;
}
}
}
return best_key;
}