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WL#1562 (Improving spatial code)

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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
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7
sql/spatial.cc
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@@ -395,7 +395,7 @@ bool Gis_line_string::init_from_wkt(Gis_read_stream *trs, String *wkb)
if (trs->skip_char(',')) // Didn't find ','
break;
}
if (n_points < 2)
if (n_points < 1)
{
trs->set_error_msg("Too few points in LINESTRING");
return 1;
@@ -484,6 +484,11 @@ int Gis_line_string::is_closed(int *closed) const
if (no_data(data, 4))
return 1;
n_points= uint4korr(data);
if (n_points == 1)
{
*closed=1;
return 0;
}
data+= 4;
if (no_data(data, SIZEOF_STORED_DOUBLE * 2 * n_points))
return 1;