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Fix a bug with building rtree_gist indexes.

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Patch from Teodor Sigaev.
This commit is contained in:
Tom Lane 2002-05-28 15:24:53 +00:00
parent a71a53079c
commit de1f586f09
1 changed files with 65 additions and 20 deletions
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85
contrib/rtree_gist/rtree_gist.c
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@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/contrib/rtree_gist/Attic/rtree_gist.c,v 1.4 2001/10/25 05:49:20 momjian Exp $
* $Header: /cvsroot/pgsql/contrib/rtree_gist/Attic/rtree_gist.c,v 1.5 2002/05/28 15:24:53 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -161,6 +161,22 @@ gbox_penalty(PG_FUNCTION_ARGS)
PG_RETURN_POINTER(result);
}
typedef struct {
BOX *key;
int pos;
} KBsort;
static int
compare_KB(const void* a, const void* b) {
BOX *abox = ((KBsort*)a)->key;
BOX *bbox = ((KBsort*)b)->key;
float sa = (abox->high.x - abox->low.x) * (abox->high.y - abox->low.y);
float sb = (bbox->high.x - bbox->low.x) * (bbox->high.y - bbox->low.y);
if ( sa==sb ) return 0;
return ( sa>sb ) ? 1 : -1;
}
/*
** The GiST PickSplit method
** New linear algorithm, see 'New Linear Node Splitting Algorithm for R-tree',
@ -201,26 +217,22 @@ gbox_picksplit(PG_FUNCTION_ARGS)
for (i = OffsetNumberNext(FirstOffsetNumber); i <= maxoff; i = OffsetNumberNext(i))
{
cur = DatumGetBoxP(((GISTENTRY *) VARDATA(entryvec))[i].key);
if ( allisequal == true && (
pageunion.high.x != cur->high.x ||
pageunion.high.y != cur->high.y ||
pageunion.low.x != cur->low.x ||
pageunion.low.y != cur->low.y
) )
allisequal = false;
if (pageunion.high.x < cur->high.x)
{
allisequal = false;
pageunion.high.x = cur->high.x;
}
if (pageunion.low.x > cur->low.x)
{
allisequal = false;
pageunion.low.x = cur->low.x;
}
if (pageunion.high.y < cur->high.y)
{
allisequal = false;
pageunion.high.y = cur->high.y;
}
if (pageunion.low.y > cur->low.y)
{
allisequal = false;
pageunion.low.y = cur->low.y;
}
}
nbytes = (maxoff + 2) * sizeof(OffsetNumber);
@ -264,7 +276,7 @@ gbox_picksplit(PG_FUNCTION_ARGS)
unionB = (BOX *) palloc(sizeof(BOX));
unionT = (BOX *) palloc(sizeof(BOX));
#define ADDLIST( list, unionD, pos ) do { \
#define ADDLIST( list, unionD, pos, num ) do { \
if ( pos ) { \
if ( unionD->high.x < cur->high.x ) unionD->high.x = cur->high.x; \
if ( unionD->low.x > cur->low.x ) unionD->low.x = cur->low.x; \
@ -273,7 +285,7 @@ gbox_picksplit(PG_FUNCTION_ARGS)
} else { \
memcpy( (void*)unionD, (void*) cur, sizeof( BOX ) ); \
} \
list[pos] = i; \
list[pos] = num; \
(pos)++; \
} while(0)
@ -281,17 +293,50 @@ gbox_picksplit(PG_FUNCTION_ARGS)
{
cur = DatumGetBoxP(((GISTENTRY *) VARDATA(entryvec))[i].key);
if (cur->low.x - pageunion.low.x < pageunion.high.x - cur->high.x)
ADDLIST(listL, unionL, posL);
ADDLIST(listL, unionL, posL,i);
else
ADDLIST(listR, unionR, posR);
ADDLIST(listR, unionR, posR,i);
if (cur->low.y - pageunion.low.y < pageunion.high.y - cur->high.y)
ADDLIST(listB, unionB, posB);
ADDLIST(listB, unionB, posB,i);
else
ADDLIST(listT, unionT, posT);
ADDLIST(listT, unionT, posT,i);
}
/* bad disposition, sort by ascending and resplit */
if ( (posR==0 || posL==0) && (posT==0 || posB==0) ) {
KBsort *arr = (KBsort*)palloc( sizeof(KBsort) * maxoff );
posL = posR = posB = posT = 0;
for (i = FirstOffsetNumber; i <= maxoff; i = OffsetNumberNext(i)) {
arr[i-1].key = DatumGetBoxP(((GISTENTRY *) VARDATA(entryvec))[i].key);
arr[i-1].pos = i;
}
qsort( arr, maxoff, sizeof(KBsort), compare_KB );
for (i = FirstOffsetNumber; i <= maxoff; i = OffsetNumberNext(i)) {
cur = arr[i-1].key;
if (cur->low.x - pageunion.low.x < pageunion.high.x - cur->high.x)
ADDLIST(listL, unionL, posL,arr[i-1].pos);
else if ( cur->low.x - pageunion.low.x == pageunion.high.x - cur->high.x ) {
if ( posL>posR )
ADDLIST(listR, unionR, posR,arr[i-1].pos);
else
ADDLIST(listL, unionL, posL,arr[i-1].pos);
} else
ADDLIST(listR, unionR, posR,arr[i-1].pos);
if (cur->low.y - pageunion.low.y < pageunion.high.y - cur->high.y)
ADDLIST(listB, unionB, posB,arr[i-1].pos);
else if ( cur->low.y - pageunion.low.y == pageunion.high.y - cur->high.y ) {
if ( posB>posT )
ADDLIST(listT, unionT, posT,arr[i-1].pos);
else
ADDLIST(listB, unionB, posB,arr[i-1].pos);
} else
ADDLIST(listT, unionT, posT,arr[i-1].pos);
}
pfree(arr);
}
/* which split more optimal? */
if (Max(posL, posR) < Max(posB, posT))
direction = 'x';
else if (Max(posL, posR) > Max(posB, posT))