*
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/contrib/rtree_gist/Attic/rtree_gist.c,v 1.7 2003/07/27 17:10:06 tgl Exp $
+ * $Header: /cvsroot/pgsql/contrib/rtree_gist/Attic/rtree_gist.c,v 1.7.4.1 2009/04/07 17:49:40 teodor Exp $
*
*-------------------------------------------------------------------------
*/
return (sa > sb) ? 1 : -1;
}
+static void
+adjustBox(BOX *b, BOX *addon)
+{
+ if (b->high.x < addon->high.x)
+ b->high.x = addon->high.x;
+ if (b->low.x > addon->low.x)
+ b->low.x = addon->low.x;
+ if (b->high.y < addon->high.y)
+ b->high.y = addon->high.y;
+ if (b->low.y > addon->low.y)
+ b->low.y = addon->low.y;
+}
+
+/*
+ * Trivial split: half of entries will be placed on one page
+ * and another half - to another
+ */
+static void
+fallbackSplit(bytea *entryvec, GIST_SPLITVEC *v)
+{
+ OffsetNumber i,
+ maxoff;
+ BOX *unionL = NULL,
+ *unionR = NULL;
+ int nbytes;
+
+ maxoff = ((VARSIZE(entryvec) - VARHDRSZ) / sizeof(GISTENTRY)) - 1;
+
+ nbytes = (maxoff + 2) * sizeof(OffsetNumber);
+ v->spl_left = (OffsetNumber *) palloc(nbytes);
+ v->spl_right = (OffsetNumber *) palloc(nbytes);
+ v->spl_nleft = v->spl_nright = 0;
+
+ for (i = FirstOffsetNumber; i <= maxoff; i = OffsetNumberNext(i))
+ {
+ BOX * cur = DatumGetBoxP(((GISTENTRY *) VARDATA(entryvec))[i].key);
+
+ if (i <= (maxoff - FirstOffsetNumber + 1) / 2)
+ {
+ v->spl_left[v->spl_nleft] = i;
+ if (unionL == NULL)
+ {
+ unionL = (BOX *) palloc(sizeof(BOX));
+ *unionL = *cur;
+ }
+ else
+ adjustBox(unionL, cur);
+
+ v->spl_nleft++;
+ }
+ else
+ {
+ v->spl_right[v->spl_nright] = i;
+ if (unionR == NULL)
+ {
+ unionR = (BOX *) palloc(sizeof(BOX));
+ *unionR = *cur;
+ }
+ else
+ adjustBox(unionR, cur);
+
+ v->spl_nright++;
+ }
+ }
+}
+
/*
** The GiST PickSplit method
** New linear algorithm, see 'New Linear Node Splitting Algorithm for R-tree',
))
allisequal = false;
- if (pageunion.high.x < cur->high.x)
- pageunion.high.x = cur->high.x;
- if (pageunion.low.x > cur->low.x)
- pageunion.low.x = cur->low.x;
- if (pageunion.high.y < cur->high.y)
- pageunion.high.y = cur->high.y;
- if (pageunion.low.y > cur->low.y)
- pageunion.low.y = cur->low.y;
+ adjustBox(&pageunion, cur);
}
- nbytes = (maxoff + 2) * sizeof(OffsetNumber);
- listL = (OffsetNumber *) palloc(nbytes);
- listR = (OffsetNumber *) palloc(nbytes);
- unionL = (BOX *) palloc(sizeof(BOX));
- unionR = (BOX *) palloc(sizeof(BOX));
if (allisequal)
{
- cur = DatumGetBoxP(((GISTENTRY *) VARDATA(entryvec))[OffsetNumberNext(FirstOffsetNumber)].key);
- if (memcmp((void *) cur, (void *) &pageunion, sizeof(BOX)) == 0)
- {
- v->spl_left = listL;
- v->spl_right = listR;
- v->spl_nleft = v->spl_nright = 0;
- memcpy((void *) unionL, (void *) &pageunion, sizeof(BOX));
- memcpy((void *) unionR, (void *) &pageunion, sizeof(BOX));
-
- for (i = FirstOffsetNumber; i <= maxoff; i = OffsetNumberNext(i))
- {
- if (i <= (maxoff - FirstOffsetNumber + 1) / 2)
- {
- v->spl_left[v->spl_nleft] = i;
- v->spl_nleft++;
- }
- else
- {
- v->spl_right[v->spl_nright] = i;
- v->spl_nright++;
- }
- }
- v->spl_ldatum = BoxPGetDatum(unionL);
- v->spl_rdatum = BoxPGetDatum(unionR);
-
- PG_RETURN_POINTER(v);
- }
+ /*
+ * All entries are the same
+ */
+ fallbackSplit(entryvec, v);
+ PG_RETURN_POINTER(v);
}
+ nbytes = (maxoff + 2) * sizeof(OffsetNumber);
+ listL = (OffsetNumber *) palloc(nbytes);
+ listR = (OffsetNumber *) palloc(nbytes);
listB = (OffsetNumber *) palloc(nbytes);
listT = (OffsetNumber *) palloc(nbytes);
+ unionL = (BOX *) palloc(sizeof(BOX));
+ unionR = (BOX *) palloc(sizeof(BOX));
unionB = (BOX *) palloc(sizeof(BOX));
unionT = (BOX *) palloc(sizeof(BOX));
ADDLIST(listT, unionT, posT, arr[i - 1].pos);
}
pfree(arr);
+
+ if ((posR == 0 || posL == 0) && (posT == 0 || posB == 0))
+ {
+ fallbackSplit(entryvec, v);
+ PG_RETURN_POINTER(v);
+ }
}
/* which split more optimal? */
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/access/gist/gist.c,v 1.105.4.1 2005/08/30 08:36:52 teodor Exp $
+ * $Header: /cvsroot/pgsql/src/backend/access/gist/gist.c,v 1.105.4.2 2009/04/07 17:49:40 teodor Exp $
*
*-------------------------------------------------------------------------
*/
pfree(storage); /* pfree(evec); */
}
+/*
+ * Trivial picksplit implementaion. Function called only
+ * if user-defined picksplit puts all keys to the one page.
+ * That is a bug of user-defined picksplit but we'd like
+ * to "fix" that.
+ */
+static void
+genericPickSplit(GISTSTATE *giststate, bytea *entryvec, GIST_SPLITVEC *v)
+{
+ OffsetNumber i,
+ maxoff;
+ int nbytes;
+ bytea *evec;
+ char *storage;
+
+ maxoff = ((VARSIZE(entryvec) - VARHDRSZ) / sizeof(GISTENTRY)) - 1;
+
+ nbytes = (maxoff + 2) * sizeof(OffsetNumber);
+
+ v->spl_left = (OffsetNumber *) palloc(nbytes);
+ v->spl_right = (OffsetNumber *) palloc(nbytes);
+ v->spl_nleft = v->spl_nright = 0;
+
+ for (i = FirstOffsetNumber; i <= maxoff; i = OffsetNumberNext(i))
+ {
+ if (i <= (maxoff - FirstOffsetNumber + 1) / 2)
+ {
+ v->spl_left[v->spl_nleft] = i;
+ v->spl_nleft++;
+ }
+ else
+ {
+ v->spl_right[v->spl_nright] = i;
+ v->spl_nright++;
+ }
+ }
+
+ /*
+ * Form unions of each page
+ */
+
+ /* workaround for 64-bit: ensure GISTENTRY array is maxaligned */
+ storage = (char *) palloc(VARSIZE(entryvec) + MAXALIGN(VARHDRSZ));
+ evec = (bytea *) (storage + MAXALIGN(VARHDRSZ) - VARHDRSZ);
+
+ VARATT_SIZEP(evec) = v->spl_nleft * sizeof(GISTENTRY) + VARHDRSZ;
+ memcpy(VARDATA(evec), ((GISTENTRY *) VARDATA(entryvec)) + FirstOffsetNumber,
+ sizeof(GISTENTRY) * v->spl_nleft);
+ v->spl_ldatum = FunctionCall2(&giststate->unionFn[0],
+ PointerGetDatum(evec),
+ PointerGetDatum(&nbytes));
+
+ VARATT_SIZEP(evec) = v->spl_nright * sizeof(GISTENTRY) + VARHDRSZ;
+ memcpy(VARDATA(evec), ((GISTENTRY *) VARDATA(entryvec)) + FirstOffsetNumber + v->spl_nleft,
+ sizeof(GISTENTRY) * v->spl_nright);
+ v->spl_rdatum = FunctionCall2(&giststate->unionFn[0],
+ PointerGetDatum(evec),
+ PointerGetDatum(&nbytes));
+}
+
/*
* gistSplit -- split a page in the tree.
*/
PointerGetDatum(entryvec),
PointerGetDatum(&v));
- /* compatibility with old code */
- if (v.spl_left[v.spl_nleft - 1] == InvalidOffsetNumber)
- v.spl_left[v.spl_nleft - 1] = (OffsetNumber) *len;
- if (v.spl_right[v.spl_nright - 1] == InvalidOffsetNumber)
- v.spl_right[v.spl_nright - 1] = (OffsetNumber) *len;
+ if ( v.spl_nleft == 0 || v.spl_nright == 0 )
+ {
+ ereport(DEBUG1,
+ (errcode(ERRCODE_INTERNAL_ERROR),
+ errmsg("Picksplit method for first column of index \"%s\" failed",
+ RelationGetRelationName(r)),
+ errhint("Index is not optimal, to optimize it contact developer or try to use the column as a second one in create index command")));
+
+ genericPickSplit(giststate, entryvec, &v);
+ }
+ else
+ {
+ /* compatibility with old code */
+ if (v.spl_left[v.spl_nleft - 1] == InvalidOffsetNumber)
+ v.spl_left[v.spl_nleft - 1] = (OffsetNumber) *len;
+ if (v.spl_right[v.spl_nright - 1] == InvalidOffsetNumber)
+ v.spl_right[v.spl_nright - 1] = (OffsetNumber) *len;
+ }
v.spl_lattr[0] = v.spl_ldatum;
v.spl_rattr[0] = v.spl_rdatum;
projects / postgresql.git / commitdiff