diff --git a/src/backend/access/gist/Makefile.inc b/src/backend/access/gist/Makefile.inc
new file mode 100644
index 00000000000..8519ab0a582
--- /dev/null
+++ b/src/backend/access/gist/Makefile.inc
@@ -0,0 +1,16 @@
+#-------------------------------------------------------------------------
+#
+# Makefile.inc--
+# Makefile for access/rtree (R-Tree access method)
+#
+# Copyright (c) 1994, Regents of the University of California
+#
+#
+# IDENTIFICATION
+# /usr/local/devel/pglite/cvs/src/backend/access/rtree/Makefile.inc,v 1.2 1995/03/21 06:50:48 andrew Exp
+#
+#-------------------------------------------------------------------------
+
+SUBSRCS+= gist.c gistget.c gistscan.c giststrat.c
+
+
diff --git a/src/backend/access/gist/gist.c b/src/backend/access/gist/gist.c
new file mode 100644
index 00000000000..4b620da5375
--- /dev/null
+++ b/src/backend/access/gist/gist.c
@@ -0,0 +1,1316 @@
+/*-------------------------------------------------------------------------
+ *
+ * gist.c--
+ * interface routines for the postgres GiST index access method.
+ *
+ *
+ *
+ * IDENTIFICATION
+ *
+ *
+ *-------------------------------------------------------------------------
+ */
+#include "postgres.h"
+
+#include "storage/bufmgr.h"
+#include "storage/bufpage.h"
+
+#include "utils/elog.h"
+#include "utils/palloc.h"
+#include "utils/rel.h"
+#include "utils/excid.h"
+
+#include "access/heapam.h"
+#include "access/genam.h"
+#include "access/gist.h"
+#include "access/gistscan.h"
+#include "access/funcindex.h"
+#include "access/tupdesc.h"
+
+#include "nodes/execnodes.h"
+#include "nodes/plannodes.h"
+
+#include "executor/executor.h"
+#include "executor/tuptable.h"
+
+#include "catalog/index.h"
+
+/* non-export function prototypes */
+static InsertIndexResult gistdoinsert(Relation r, IndexTuple itup,
+ GISTSTATE *GISTstate);
+static InsertIndexResult gistentryinsert(Relation r, GISTSTACK *stk,
+ IndexTuple tup,
+ GISTSTATE *giststate);
+static void gistentryinserttwo(Relation r, GISTSTACK *stk, IndexTuple ltup,
+ IndexTuple rtup, GISTSTATE *giststate);
+static void gistAdjustKeys(Relation r, GISTSTACK *stk, BlockNumber blk,
+ char *datum, int att_size, GISTSTATE *giststate);
+static void gistintinsert(Relation r, GISTSTACK *stk, IndexTuple ltup,
+ IndexTuple rtup, GISTSTATE *giststate);
+static InsertIndexResult gistSplit(Relation r, Buffer buffer,
+ GISTSTACK *stack, IndexTuple itup,
+ GISTSTATE *giststate);
+static void gistnewroot(GISTSTATE *giststate, Relation r, IndexTuple lt,
+ IndexTuple rt);
+static void GISTInitBuffer(Buffer b, uint32 f);
+static BlockNumber gistChooseSubtree(Relation r, IndexTuple itup, int level,
+ GISTSTATE *giststate,
+ GISTSTACK **retstack, Buffer *leafbuf);
+static OffsetNumber gistchoose(Relation r, Page p, IndexTuple it,
+ GISTSTATE *giststate);
+static int gistnospace(Page p, IndexTuple it);
+void gistdelete(Relation r, ItemPointer tid);
+static IndexTuple gist_tuple_replacekey(Relation r, GISTENTRY entry, IndexTuple t);
+
+
+/*
+** routine to build an index. Basically calls insert over and over
+*/
+void
+gistbuild(Relation heap,
+ Relation index,
+ int natts,
+ AttrNumber *attnum,
+ IndexStrategy istrat,
+ uint16 pint,
+ Datum *params,
+ FuncIndexInfo *finfo,
+ PredInfo *predInfo)
+{
+ HeapScanDesc scan;
+ Buffer buffer;
+ AttrNumber i;
+ HeapTuple htup;
+ IndexTuple itup;
+ TupleDesc hd, id;
+ InsertIndexResult res;
+ Datum *d;
+ bool *nulls;
+ int nb, nh, ni;
+ ExprContext *econtext;
+ TupleTable tupleTable;
+ TupleTableSlot *slot;
+ Oid hrelid, irelid;
+ Node *pred, *oldPred;
+ GISTSTATE giststate;
+ GISTENTRY tmpcentry;
+ bool *compvec;
+
+ /* GiSTs only know how to do stupid locking now */
+ RelationSetLockForWrite(index);
+
+ setheapoverride(TRUE); /* so we can see the new pg_index tuple */
+ initGISTstate(&giststate, index);
+ setheapoverride(FALSE);
+
+ pred = predInfo->pred;
+ oldPred = predInfo->oldPred;
+
+ /*
+ * We expect to be called exactly once for any index relation.
+ * If that's not the case, big trouble's what we have.
+ */
+
+ if (oldPred == NULL && (nb = RelationGetNumberOfBlocks(index)) != 0)
+ elog(WARN, "%.16s already contains data", &(index->rd_rel->relname.data[0]));
+
+ /* initialize the root page (if this is a new index) */
+ if (oldPred == NULL) {
+ buffer = ReadBuffer(index, P_NEW);
+ GISTInitBuffer(buffer, F_LEAF);
+ WriteBuffer(buffer);
+ }
+
+ /* init the tuple descriptors and get set for a heap scan */
+ hd = RelationGetTupleDescriptor(heap);
+ id = RelationGetTupleDescriptor(index);
+ d = (Datum *)palloc(natts * sizeof (*d));
+ nulls = (bool *)palloc(natts * sizeof (*nulls));
+
+ /*
+ * If this is a predicate (partial) index, we will need to evaluate the
+ * predicate using ExecQual, which requires the current tuple to be in a
+ * slot of a TupleTable. In addition, ExecQual must have an ExprContext
+ * referring to that slot. Here, we initialize dummy TupleTable and
+ * ExprContext objects for this purpose. --Nels, Feb '92
+ */
+#ifndef OMIT_PARTIAL_INDEX
+ if (pred != NULL || oldPred != NULL) {
+ tupleTable = ExecCreateTupleTable(1);
+ slot = ExecAllocTableSlot(tupleTable);
+ econtext = makeNode(ExprContext);
+ FillDummyExprContext(econtext, slot, hd, buffer);
+ }
+#endif /* OMIT_PARTIAL_INDEX */
+ scan = heap_beginscan(heap, 0, NowTimeQual, 0, (ScanKey) NULL);
+ htup = heap_getnext(scan, 0, &buffer);
+
+ /* int the tuples as we insert them */
+ nh = ni = 0;
+
+ for (; HeapTupleIsValid(htup); htup = heap_getnext(scan, 0, &buffer)) {
+
+ nh++;
+
+ /*
+ * If oldPred != NULL, this is an EXTEND INDEX command, so skip
+ * this tuple if it was already in the existing partial index
+ */
+ if (oldPred != NULL) {
+#ifndef OMIT_PARTIAL_INDEX
+ /*SetSlotContents(slot, htup); */
+ slot->val = htup;
+ if (ExecQual((List*)oldPred, econtext) == true) {
+ ni++;
+ continue;
+ }
+#endif /* OMIT_PARTIAL_INDEX */
+ }
+
+ /* Skip this tuple if it doesn't satisfy the partial-index predicate */
+ if (pred != NULL) {
+#ifndef OMIT_PARTIAL_INDEX
+ /*SetSlotContents(slot, htup); */
+ slot->val = htup;
+ if (ExecQual((List*)pred, econtext) == false)
+ continue;
+#endif /* OMIT_PARTIAL_INDEX */
+ }
+
+ ni++;
+
+ /*
+ * For the current heap tuple, extract all the attributes
+ * we use in this index, and note which are null.
+ */
+
+ for (i = 1; i <= natts; i++) {
+ int attoff;
+ bool attnull;
+
+ /*
+ * Offsets are from the start of the tuple, and are
+ * zero-based; indices are one-based. The next call
+ * returns i - 1. That's data hiding for you.
+ */
+
+ attoff = AttrNumberGetAttrOffset(i);
+ /*
+ d[attoff] = HeapTupleGetAttributeValue(htup, buffer,
+ */
+ d[attoff] = GetIndexValue(htup,
+ hd,
+ attoff,
+ attnum,
+ finfo,
+ &attnull,
+ buffer);
+ nulls[attoff] = (attnull ? 'n' : ' ');
+ }
+
+ /* immediately compress keys to normalize */
+ compvec = (bool *)palloc(sizeof(bool) * natts);
+ for (i = 0; i < natts; i++) {
+ gistcentryinit(&giststate, &tmpcentry, (char *)d[i],
+ (Relation) NULL, (Page) NULL, (OffsetNumber) 0,
+ -1 /* size is currently bogus */, TRUE);
+ if (d[i] != (Datum)tmpcentry.pred && !(giststate.keytypbyval))
+ compvec[i] = TRUE;
+ else compvec[i] = FALSE;
+ d[i] = (Datum)tmpcentry.pred;
+ }
+
+ /* form an index tuple and point it at the heap tuple */
+ itup = index_formtuple(id, &d[0], nulls);
+ itup->t_tid = htup->t_ctid;
+
+ /*
+ * Since we already have the index relation locked, we
+ * call gistdoinsert directly. Normal access method calls
+ * dispatch through gistinsert, which locks the relation
+ * for write. This is the right thing to do if you're
+ * inserting single tups, but not when you're initializing
+ * the whole index at once.
+ */
+
+ res = gistdoinsert(index, itup, &giststate);
+ for (i = 0; i < natts; i++)
+ if (compvec[i] == TRUE) pfree((char *)d[i]);
+ pfree(itup);
+ pfree(res);
+ pfree(compvec);
+ }
+
+ /* okay, all heap tuples are indexed */
+ heap_endscan(scan);
+ RelationUnsetLockForWrite(index);
+
+ if (pred != NULL || oldPred != NULL) {
+#ifndef OMIT_PARTIAL_INDEX
+ ExecDestroyTupleTable(tupleTable, true);
+ pfree(econtext);
+#endif /* OMIT_PARTIAL_INDEX */
+ }
+
+ /*
+ * Since we just inted the tuples in the heap, we update its
+ * stats in pg_relation to guarantee that the planner takes
+ * advantage of the index we just created. UpdateStats() does a
+ * CommandinterIncrement(), which flushes changed entries from
+ * the system relcache. The act of constructing an index changes
+ * these heap and index tuples in the system catalogs, so they
+ * need to be flushed. We close them to guarantee that they
+ * will be.
+ */
+
+ hrelid = heap->rd_id;
+ irelid = index->rd_id;
+ heap_close(heap);
+ index_close(index);
+
+ UpdateStats(hrelid, nh, true);
+ UpdateStats(irelid, ni, false);
+
+ if (oldPred != NULL) {
+ if (ni == nh) pred = NULL;
+ UpdateIndexPredicate(irelid, oldPred, pred);
+ }
+
+ /* be tidy */
+ pfree(nulls);
+ pfree(d);
+}
+
+/*
+ * gistinsert -- wrapper for GiST tuple insertion.
+ *
+ * This is the public interface routine for tuple insertion in GiSTs.
+ * It doesn't do any work; just locks the relation and passes the buck.
+ */
+InsertIndexResult
+gistinsert(Relation r, Datum *datum, char *nulls, ItemPointer ht_ctid)
+{
+ InsertIndexResult res;
+ IndexTuple itup;
+ GISTSTATE giststate;
+ GISTENTRY tmpentry;
+ int i;
+ bool *compvec;
+
+ initGISTstate(&giststate, r);
+
+ /* immediately compress keys to normalize */
+ compvec = (bool *)palloc(sizeof(bool) * r->rd_att->natts);
+ for (i = 0; i < r->rd_att->natts; i++) {
+ gistcentryinit(&giststate, &tmpentry, (char *)datum[i],
+ (Relation) NULL, (Page) NULL, (OffsetNumber) 0,
+ -1 /* size is currently bogus */, TRUE);
+ if (datum[i] != (Datum)tmpentry.pred && !(giststate.keytypbyval))
+ compvec[i] = TRUE;
+ else compvec[i] = FALSE;
+ datum[i] = (Datum)tmpentry.pred;
+ }
+ itup = index_formtuple(RelationGetTupleDescriptor(r), datum, nulls);
+ itup->t_tid = *ht_ctid;
+
+ RelationSetLockForWrite(r);
+ res = gistdoinsert(r, itup, &giststate);
+ for (i = 0; i < r->rd_att->natts; i++)
+ if (compvec[i] == TRUE) pfree((char *)datum[i]);
+ pfree(itup);
+ pfree(compvec);
+
+ /* XXX two-phase locking -- don't unlock the relation until EOT */
+ return (res);
+}
+
+/*
+** Take a compressed entry, and install it on a page. Since we now know
+** where the entry will live, we decompress it and recompress it using
+** that knowledge (some compression routines may want to fish around
+** on the page, for example, or do something special for leaf nodes.)
+*/
+static OffsetNumber
+gistPageAddItem(GISTSTATE *giststate,
+ Relation r,
+ Page page,
+ Item item,
+ Size size,
+ OffsetNumber offsetNumber,
+ ItemIdFlags flags,
+ GISTENTRY *dentry,
+ IndexTuple *newtup)
+{
+ GISTENTRY tmpcentry;
+ IndexTuple itup = (IndexTuple)item;
+
+ /* recompress the item given that we now know the exact page and
+ offset for insertion */
+ gistdentryinit(giststate, dentry,
+ (((char *) itup) + sizeof(IndexTupleData)),
+ (Relation)0, (Page)0, (OffsetNumber)InvalidOffsetNumber,
+ IndexTupleSize(itup) - sizeof(IndexTupleData), FALSE);
+ gistcentryinit(giststate, &tmpcentry, dentry->pred, r, page,
+ offsetNumber, dentry->bytes, FALSE);
+ *newtup = gist_tuple_replacekey(r, *dentry, itup);
+ /* be tidy */
+ if (tmpcentry.pred != dentry->pred
+ && tmpcentry.pred != (((char *) itup) + sizeof(IndexTupleData)))
+ pfree(tmpcentry.pred);
+
+ return(PageAddItem(page, (Item) *newtup, IndexTupleSize(*newtup),
+ offsetNumber, flags));
+}
+
+
+static InsertIndexResult
+gistdoinsert(Relation r,
+ IndexTuple itup, /* itup contains compressed entry */
+ GISTSTATE *giststate)
+{
+ char *datum, *newdatum;
+ GISTENTRY entry, tmpdentry;
+ InsertIndexResult res;
+ OffsetNumber l;
+ GISTSTACK *stack, *tmpstk;
+ Buffer buffer;
+ BlockNumber blk;
+ Page page;
+ OffsetNumber off;
+ IndexTuple newtup;
+
+ /* 3rd arg is ignored for now */
+ blk = gistChooseSubtree(r, itup, 0, giststate, &stack, &buffer);
+ page = (Page) BufferGetPage(buffer);
+
+ if (gistnospace(page, itup)) {
+ /* need to do a split */
+ res = gistSplit(r, buffer, stack, itup, giststate);
+ gistfreestack(stack);
+ WriteBuffer(buffer); /* don't forget to release buffer! */
+ return (res);
+ }
+
+ if (PageIsEmpty(page))
+ off = FirstOffsetNumber;
+ else
+ off = OffsetNumberNext(PageGetMaxOffsetNumber(page));
+
+ /* add the item and write the buffer */
+ l = gistPageAddItem(giststate, r, page, (Item) itup, IndexTupleSize(itup),
+ off, LP_USED, &tmpdentry, &newtup);
+ WriteBuffer(buffer);
+
+ /* now expand the page boundary in the parent to include the new child */
+ gistAdjustKeys(r, stack, blk, tmpdentry.pred, tmpdentry.bytes, giststate);
+ gistfreestack(stack);
+
+ /* be tidy */
+ if (itup != newtup)
+ pfree(newtup);
+ if (tmpdentry.pred != (((char *) itup) + sizeof(IndexTupleData)))
+ pfree(tmpdentry.pred);
+
+ /* build and return an InsertIndexResult for this insertion */
+ res = (InsertIndexResult) palloc(sizeof(InsertIndexResultData));
+ ItemPointerSet(&(res->pointerData), blk, l);
+
+ return (res);
+}
+
+
+static BlockNumber
+gistChooseSubtree(Relation r, IndexTuple itup, /* itup has compressed entry */
+ int level,
+ GISTSTATE *giststate,
+ GISTSTACK **retstack /*out*/,
+ Buffer *leafbuf /*out*/)
+{
+ Buffer buffer;
+ BlockNumber blk;
+ GISTSTACK *stack;
+ Page page;
+ GISTPageOpaque opaque;
+ IndexTuple which;
+
+ blk = GISTP_ROOT;
+ buffer = InvalidBuffer;
+ stack = (GISTSTACK *) NULL;
+
+ do {
+ /* let go of current buffer before getting next */
+ if (buffer != InvalidBuffer)
+ ReleaseBuffer(buffer);
+
+ /* get next buffer */
+ buffer = ReadBuffer(r, blk);
+ page = (Page) BufferGetPage(buffer);
+
+ opaque = (GISTPageOpaque) PageGetSpecialPointer(page);
+ if (!(opaque->flags & F_LEAF)) {
+ GISTSTACK *n;
+ ItemId iid;
+
+ n = (GISTSTACK *) palloc(sizeof(GISTSTACK));
+ n->gs_parent = stack;
+ n->gs_blk = blk;
+ n->gs_child = gistchoose(r, page, itup, giststate);
+ stack = n;
+
+ iid = PageGetItemId(page, n->gs_child);
+ which = (IndexTuple) PageGetItem(page, iid);
+ blk = ItemPointerGetBlockNumber(&(which->t_tid));
+ }
+ } while (!(opaque->flags & F_LEAF));
+
+ *retstack = stack;
+ *leafbuf = buffer;
+
+ return(blk);
+}
+
+
+static void
+gistAdjustKeys(Relation r,
+ GISTSTACK *stk,
+ BlockNumber blk,
+ char *datum, /* datum is uncompressed */
+ int att_size,
+ GISTSTATE *giststate)
+{
+ char *oldud;
+ Page p;
+ Buffer b;
+ bool result;
+ bytea *evec;
+ GISTENTRY centry, *ev0p, *ev1p, *dentryp;
+ int size, datumsize;
+ IndexTuple tid;
+
+ if (stk == (GISTSTACK *) NULL)
+ return;
+
+ b = ReadBuffer(r, stk->gs_blk);
+ p = BufferGetPage(b);
+
+ oldud = (char *) PageGetItem(p, PageGetItemId(p, stk->gs_child));
+ tid = (IndexTuple) oldud;
+ size = IndexTupleSize((IndexTuple)oldud) - sizeof(IndexTupleData);
+ oldud += sizeof(IndexTupleData);
+
+ evec = (bytea *) palloc(2*sizeof(GISTENTRY) + VARHDRSZ);
+ VARSIZE(evec) = 2*sizeof(GISTENTRY) + VARHDRSZ;
+
+ /* insert decompressed oldud into entry vector */
+ gistdentryinit(giststate, &((GISTENTRY *)VARDATA(evec))[0],
+ oldud, r, p, stk->gs_child,
+ size, FALSE);
+ ev0p = &((GISTENTRY *)VARDATA(evec))[0];
+
+ /* insert datum entry into entry vector */
+ gistentryinit(((GISTENTRY *)VARDATA(evec))[1], datum,
+ (Relation)NULL,(Page)NULL,(OffsetNumber)0, att_size, FALSE);
+ ev1p = &((GISTENTRY *)VARDATA(evec))[1];
+
+ /* form union of decompressed entries */
+ datum = (char *) (giststate->unionFn)(evec, &datumsize);
+
+ /* did union leave decompressed version of oldud unchanged? */
+ (giststate->equalFn)(ev0p->pred, datum, &result);
+ if (!result) {
+ TupleDesc td = RelationGetTupleDescriptor(r);
+
+ /* compress datum for storage on page */
+ gistcentryinit(giststate, ¢ry, datum, ev0p->rel, ev0p->page,
+ ev0p->offset, datumsize, FALSE);
+ if (td->attrs[0]->attlen >= 0) {
+ memmove(oldud, centry.pred, att_size);
+ gistAdjustKeys(r, stk->gs_parent, stk->gs_blk, datum, att_size,
+ giststate);
+ }
+ else if (VARSIZE(centry.pred) == VARSIZE(oldud)) {
+ memmove(oldud, centry.pred, VARSIZE(centry.pred));
+ gistAdjustKeys(r, stk->gs_parent, stk->gs_blk, datum, att_size,
+ giststate);
+ }
+ else {
+ /*
+ ** new datum is not the same size as the old.
+ ** We have to delete the old entry and insert the new
+ ** one. Note that this may cause a split here!
+ */
+ IndexTuple newtup;
+ ItemPointerData oldtid;
+ char *isnull;
+ TupleDesc tupDesc;
+ InsertIndexResult res;
+
+ /* delete old tuple */
+ ItemPointerSet(&oldtid, stk->gs_blk, stk->gs_child);
+ gistdelete(r, (ItemPointer)&oldtid);
+
+ /* generate and insert new tuple */
+ tupDesc = r->rd_att;
+ isnull = (char *) palloc(r->rd_rel->relnatts);
+ memset(isnull, ' ', r->rd_rel->relnatts);
+ newtup = (IndexTuple) index_formtuple(tupDesc,
+ (Datum *) ¢ry.pred, isnull);
+ pfree(isnull);
+ /* set pointer in new tuple to point to current child */
+ ItemPointerSet(&oldtid, blk, 1);
+ newtup->t_tid = oldtid;
+
+ /* inserting the new entry also adjust keys above */
+ res = gistentryinsert(r, stk, newtup, giststate);
+
+ /* in stack, set info to point to new tuple */
+ stk->gs_blk = ItemPointerGetBlockNumber(&(res->pointerData));
+ stk->gs_child = ItemPointerGetOffsetNumber(&(res->pointerData));
+
+ pfree(res);
+ }
+ WriteBuffer(b);
+
+ if (centry.pred != datum)
+ pfree(datum);
+ }
+ else {
+ ReleaseBuffer(b);
+ }
+ pfree(evec);
+}
+
+/*
+ * gistSplit -- split a page in the tree.
+ *
+ */
+static InsertIndexResult
+gistSplit(Relation r,
+ Buffer buffer,
+ GISTSTACK *stack,
+ IndexTuple itup, /* contains compressed entry */
+ GISTSTATE *giststate)
+{
+ Page p;
+ Buffer leftbuf, rightbuf;
+ Page left, right;
+ ItemId itemid;
+ IndexTuple item;
+ IndexTuple ltup, rtup, newtup;
+ OffsetNumber maxoff;
+ OffsetNumber i;
+ OffsetNumber leftoff, rightoff;
+ BlockNumber lbknum, rbknum;
+ BlockNumber bufblock;
+ GISTPageOpaque opaque;
+ int blank;
+ InsertIndexResult res;
+ char *isnull;
+ GIST_SPLITVEC v;
+ TupleDesc tupDesc;
+ bytea *entryvec;
+ bool *decompvec;
+ IndexTuple item_1;
+ GISTENTRY tmpdentry, tmpentry;
+ char *datum;
+
+ isnull = (char *) palloc(r->rd_rel->relnatts);
+ for (blank = 0; blank < r->rd_rel->relnatts; blank++)
+ isnull[blank] = ' ';
+ p = (Page) BufferGetPage(buffer);
+ opaque = (GISTPageOpaque) PageGetSpecialPointer(p);
+
+
+ /*
+ * The root of the tree is the first block in the relation. If
+ * we're about to split the root, we need to do some hocus-pocus
+ * to enforce this guarantee.
+ */
+
+ if (BufferGetBlockNumber(buffer) == GISTP_ROOT) {
+ leftbuf = ReadBuffer(r, P_NEW);
+ GISTInitBuffer(leftbuf, opaque->flags);
+ lbknum = BufferGetBlockNumber(leftbuf);
+ left = (Page) BufferGetPage(leftbuf);
+ } else {
+ leftbuf = buffer;
+ IncrBufferRefCount(buffer);
+ lbknum = BufferGetBlockNumber(buffer);
+ left = (Page) PageGetTempPage(p, sizeof(GISTPageOpaqueData));
+ }
+
+ rightbuf = ReadBuffer(r, P_NEW);
+ GISTInitBuffer(rightbuf, opaque->flags);
+ rbknum = BufferGetBlockNumber(rightbuf);
+ right = (Page) BufferGetPage(rightbuf);
+
+ /* generate the item array */
+ maxoff = PageGetMaxOffsetNumber(p);
+ entryvec = (bytea *)palloc(VARHDRSZ + (maxoff + 2) * sizeof(GISTENTRY));
+ decompvec = (bool *)palloc(VARHDRSZ + (maxoff + 2) * sizeof(bool));
+ for (i = FirstOffsetNumber; i <= maxoff; i = OffsetNumberNext(i)) {
+ item_1 = (IndexTuple) PageGetItem(p, PageGetItemId(p, i));
+ gistdentryinit(giststate, &((GISTENTRY *)VARDATA(entryvec))[i],
+ (((char *) item_1) + sizeof(IndexTupleData)),
+ r, p, i,
+ IndexTupleSize(item_1) - sizeof(IndexTupleData), FALSE);
+ if ((char *)(((GISTENTRY *)VARDATA(entryvec))[i].pred)
+ == (((char *) item_1) + sizeof(IndexTupleData)))
+ decompvec[i] = FALSE;
+ else decompvec[i] = TRUE;
+ }
+
+ /* add the new datum as the last entry */
+ gistdentryinit(giststate, &(((GISTENTRY *)VARDATA(entryvec))[maxoff+1]),
+ (((char *) itup) + sizeof(IndexTupleData)),
+ (Relation)NULL, (Page)NULL,
+ (OffsetNumber)0, tmpentry.bytes, FALSE);
+ if ((char *)(((GISTENTRY *)VARDATA(entryvec))[maxoff+1]).pred !=
+ (((char *) itup) + sizeof(IndexTupleData)))
+ decompvec[maxoff+1] = TRUE;
+ else decompvec[maxoff+1] = FALSE;
+
+ VARSIZE(entryvec) = (maxoff + 2) * sizeof(GISTENTRY) + VARHDRSZ;
+
+ /* now let the user-defined picksplit function set up the split vector */
+ (giststate->picksplitFn)(entryvec, &v);
+
+ /* compress ldatum and rdatum */
+ gistcentryinit(giststate, &tmpentry, v.spl_ldatum, (Relation)NULL,
+ (Page)NULL, (OffsetNumber)0,
+ ((GISTENTRY *)VARDATA(entryvec))[i].bytes, FALSE);
+ if (v.spl_ldatum != tmpentry.pred)
+ pfree(v.spl_ldatum);
+ v.spl_ldatum = tmpentry.pred;
+
+ gistcentryinit(giststate, &tmpentry, v.spl_rdatum, (Relation)NULL,
+ (Page)NULL, (OffsetNumber)0,
+ ((GISTENTRY *)VARDATA(entryvec))[i].bytes, FALSE);
+ if (v.spl_rdatum != tmpentry.pred)
+ pfree(v.spl_rdatum);
+ v.spl_rdatum = tmpentry.pred;
+
+ /* clean up the entry vector: its preds need to be deleted, too */
+ for (i = FirstOffsetNumber; i <= maxoff+1; i = OffsetNumberNext(i))
+ if (decompvec[i])
+ pfree(((GISTENTRY *)VARDATA(entryvec))[i].pred);
+ pfree(entryvec);
+ pfree(decompvec);
+
+ leftoff = rightoff = FirstOffsetNumber;
+ maxoff = PageGetMaxOffsetNumber(p);
+ for (i = FirstOffsetNumber; i <= maxoff; i = OffsetNumberNext(i)) {
+ itemid = PageGetItemId(p, i);
+ item = (IndexTuple) PageGetItem(p, itemid);
+
+ if (i == *(v.spl_left)) {
+ (void) gistPageAddItem(giststate, r, left, (Item) item,
+ IndexTupleSize(item),
+ leftoff, LP_USED, &tmpdentry, &newtup);
+ leftoff = OffsetNumberNext(leftoff);
+ v.spl_left++; /* advance in left split vector */
+ /* be tidy */
+ if (tmpdentry.pred != (((char *) item) + sizeof(IndexTupleData)))
+ pfree(tmpdentry.pred);
+ if ((IndexTuple)item != newtup)
+ pfree(newtup);
+ }
+ else {
+ (void) gistPageAddItem(giststate, r, right, (Item) item,
+ IndexTupleSize(item),
+ rightoff, LP_USED, &tmpdentry, &newtup);
+ rightoff = OffsetNumberNext(rightoff);
+ v.spl_right++; /* advance in right split vector */
+ /* be tidy */
+ if (tmpdentry.pred != (((char *) item) + sizeof(IndexTupleData)))
+ pfree(tmpdentry.pred);
+ if (item != newtup)
+ pfree(newtup);
+ }
+ }
+
+ /* build an InsertIndexResult for this insertion */
+ res = (InsertIndexResult) palloc(sizeof(InsertIndexResultData));
+
+ /* now insert the new index tuple */
+ if (*(v.spl_left) != FirstOffsetNumber) {
+ (void) gistPageAddItem(giststate, r, left, (Item) itup,
+ IndexTupleSize(itup),
+ leftoff, LP_USED, &tmpdentry, &newtup);
+ leftoff = OffsetNumberNext(leftoff);
+ ItemPointerSet(&(res->pointerData), lbknum, leftoff);
+ /* be tidy */
+ if (tmpdentry.pred != (((char *) itup) + sizeof(IndexTupleData)))
+ pfree(tmpdentry.pred);
+ if (itup != newtup)
+ pfree(newtup);
+ } else {
+ (void) gistPageAddItem(giststate, r, right, (Item) itup,
+ IndexTupleSize(itup),
+ rightoff, LP_USED, &tmpdentry, &newtup);
+ rightoff = OffsetNumberNext(rightoff);
+ ItemPointerSet(&(res->pointerData), rbknum, rightoff);
+ /* be tidy */
+ if (tmpdentry.pred != (((char *) itup) + sizeof(IndexTupleData)))
+ pfree(tmpdentry.pred);
+ if (itup != newtup)
+ pfree(newtup);
+ }
+
+ if ((bufblock = BufferGetBlockNumber(buffer)) != GISTP_ROOT) {
+ PageRestoreTempPage(left, p);
+ }
+ WriteBuffer(leftbuf);
+ WriteBuffer(rightbuf);
+
+ /*
+ * Okay, the page is split. We have three things left to do:
+ *
+ * 1) Adjust any active scans on this index to cope with changes
+ * we introduced in its structure by splitting this page.
+ *
+ * 2) "Tighten" the bounding box of the pointer to the left
+ * page in the parent node in the tree, if any. Since we
+ * moved a bunch of stuff off the left page, we expect it
+ * to get smaller. This happens in the internal insertion
+ * routine.
+ *
+ * 3) Insert a pointer to the right page in the parent. This
+ * may cause the parent to split. If it does, we need to
+ * repeat steps one and two for each split node in the tree.
+ */
+
+ /* adjust active scans */
+ gistadjscans(r, GISTOP_SPLIT, bufblock, FirstOffsetNumber);
+
+ tupDesc = r->rd_att;
+
+ ltup = (IndexTuple) index_formtuple(tupDesc,
+ (Datum *) &(v.spl_ldatum), isnull);
+ rtup = (IndexTuple) index_formtuple(tupDesc,
+ (Datum *) &(v.spl_rdatum), isnull);
+ pfree(isnull);
+
+ /* set pointers to new child pages in the internal index tuples */
+ ItemPointerSet(&(ltup->t_tid), lbknum, 1);
+ ItemPointerSet(&(rtup->t_tid), rbknum, 1);
+
+ gistintinsert(r, stack, ltup, rtup, giststate);
+
+ pfree(ltup);
+ pfree(rtup);
+
+ return (res);
+}
+
+/*
+** After a split, we need to overwrite the old entry's key in the parent,
+** and install install an entry for the new key into the parent.
+*/
+static void
+gistintinsert(Relation r,
+ GISTSTACK *stk,
+ IndexTuple ltup, /* new version of entry for old page */
+ IndexTuple rtup, /* entry for new page */
+ GISTSTATE *giststate)
+{
+ IndexTuple old;
+ Buffer b;
+ Page p;
+ ItemPointerData ltid;
+
+ if (stk == (GISTSTACK *) NULL) {
+ gistnewroot(giststate, r, ltup, rtup);
+ return;
+ }
+
+ /* remove old left pointer, insert the 2 new entries */
+ ItemPointerSet(<id, stk->gs_blk, stk->gs_child);
+ gistdelete(r, (ItemPointer)<id);
+ gistentryinserttwo(r, stk, ltup, rtup, giststate);
+}
+
+
+/*
+** Insert two entries onto one page, handling a split for either one!
+*/
+static void
+gistentryinserttwo(Relation r, GISTSTACK *stk, IndexTuple ltup,
+ IndexTuple rtup, GISTSTATE *giststate)
+{
+ Buffer b;
+ Page p;
+ InsertIndexResult res;
+ OffsetNumber off;
+ bytea *evec;
+ char *datum;
+ int size;
+ GISTENTRY tmpentry;
+ IndexTuple newtup;
+
+ b = ReadBuffer(r, stk->gs_blk);
+ p = BufferGetPage(b);
+
+ if (gistnospace(p, ltup)) {
+ res = gistSplit(r, b, stk->gs_parent, ltup, giststate);
+ WriteBuffer(b); /* don't forget to release buffer! - 01/31/94 */
+ pfree(res);
+ gistdoinsert(r, rtup, giststate);
+ } else {
+ (void) gistPageAddItem(giststate, r, p, (Item)ltup,
+ IndexTupleSize(ltup), InvalidOffsetNumber,
+ LP_USED, &tmpentry, &newtup);
+ WriteBuffer(b);
+ gistAdjustKeys(r, stk->gs_parent, stk->gs_blk, tmpentry.pred,
+ tmpentry.bytes, giststate);
+ /* be tidy */
+ if (tmpentry.pred != (((char *) ltup) + sizeof(IndexTupleData)))
+ pfree(tmpentry.pred);
+ if (ltup != newtup)
+ pfree(newtup);
+ (void)gistentryinsert(r, stk, rtup, giststate);
+ }
+}
+
+
+/*
+** Insert an entry onto a page
+*/
+static InsertIndexResult
+gistentryinsert(Relation r, GISTSTACK *stk, IndexTuple tup,
+ GISTSTATE *giststate)
+{
+ Buffer b;
+ Page p;
+ InsertIndexResult res;
+ bytea *evec;
+ char *datum;
+ int size;
+ OffsetNumber off;
+ GISTENTRY tmpentry;
+ IndexTuple newtup;
+
+ b = ReadBuffer(r, stk->gs_blk);
+ p = BufferGetPage(b);
+
+ if (gistnospace(p, tup)) {
+ res = gistSplit(r, b, stk->gs_parent, tup, giststate);
+ WriteBuffer(b); /* don't forget to release buffer! - 01/31/94 */
+ return(res);
+ }
+ else {
+ res = (InsertIndexResult) palloc(sizeof(InsertIndexResultData));
+ off = gistPageAddItem(giststate, r, p, (Item) tup, IndexTupleSize(tup),
+ InvalidOffsetNumber, LP_USED, &tmpentry, &newtup);
+ WriteBuffer(b);
+ ItemPointerSet(&(res->pointerData), stk->gs_blk, off);
+ gistAdjustKeys(r, stk->gs_parent, stk->gs_blk, tmpentry.pred,
+ tmpentry.bytes, giststate);
+ /* be tidy */
+ if (tmpentry.pred != (((char *) tup) + sizeof(IndexTupleData)))
+ pfree(tmpentry.pred);
+ if (tup != newtup)
+ pfree(newtup);
+ return(res);
+ }
+}
+
+
+static void
+gistnewroot(GISTSTATE *giststate, Relation r, IndexTuple lt, IndexTuple rt)
+{
+ Buffer b;
+ Page p;
+ GISTENTRY tmpentry;
+ IndexTuple newtup;
+
+ b = ReadBuffer(r, GISTP_ROOT);
+ GISTInitBuffer(b, 0);
+ p = BufferGetPage(b);
+ (void) gistPageAddItem(giststate, r, p, (Item) lt, IndexTupleSize(lt),
+ FirstOffsetNumber,
+ LP_USED, &tmpentry, &newtup);
+ /* be tidy */
+ if (tmpentry.pred != (((char *) lt) + sizeof(IndexTupleData)))
+ pfree(tmpentry.pred);
+ if (lt != newtup)
+ pfree(newtup);
+ (void) gistPageAddItem(giststate, r, p, (Item) rt, IndexTupleSize(rt),
+ OffsetNumberNext(FirstOffsetNumber), LP_USED,
+ &tmpentry, &newtup);
+ /* be tidy */
+ if (tmpentry.pred != (((char *) rt) + sizeof(IndexTupleData)))
+ pfree(tmpentry.pred);
+ if (rt != newtup)
+ pfree(newtup);
+ WriteBuffer(b);
+}
+
+static void
+GISTInitBuffer(Buffer b, uint32 f)
+{
+ GISTPageOpaque opaque;
+ Page page;
+ Size pageSize;
+
+ pageSize = BufferGetPageSize(b);
+
+ page = BufferGetPage(b);
+ memset(page, 0, (int) pageSize);
+ PageInit(page, pageSize, sizeof(GISTPageOpaqueData));
+
+ opaque = (GISTPageOpaque) PageGetSpecialPointer(page);
+ opaque->flags = f;
+}
+
+
+/*
+** find entry with lowest penalty
+*/
+static OffsetNumber
+gistchoose(Relation r, Page p, IndexTuple it, /* it has compressed entry */
+ GISTSTATE *giststate)
+{
+ OffsetNumber maxoff;
+ OffsetNumber i;
+ char *ud, *id;
+ char *datum;
+ float usize, dsize;
+ OffsetNumber which;
+ float which_grow;
+ GISTENTRY entry, identry;
+ int size, idsize;
+
+ idsize = IndexTupleSize(it) - sizeof(IndexTupleData);
+ id = ((char *) it) + sizeof(IndexTupleData);
+ maxoff = PageGetMaxOffsetNumber(p);
+ which_grow = -1.0;
+ which = -1;
+
+ gistdentryinit(giststate,&identry,id,(Relation)NULL,(Page)NULL,
+ (OffsetNumber)0, idsize, FALSE);
+
+ for (i = FirstOffsetNumber; i <= maxoff; i = OffsetNumberNext(i)) {
+ datum = (char *) PageGetItem(p, PageGetItemId(p, i));
+ size = IndexTupleSize(datum) - sizeof(IndexTupleData);
+ datum += sizeof(IndexTupleData);
+ gistdentryinit(giststate,&entry,datum,r,p,i,size,FALSE);
+ (giststate->penaltyFn)(entry, identry, &usize);
+ if (which_grow < 0 || usize < which_grow) {
+ which = i;
+ which_grow = usize;
+ if (which_grow == 0)
+ break;
+ }
+ if (entry.pred != datum)
+ pfree(entry.pred);
+ }
+ if (identry.pred != id)
+ pfree(identry.pred);
+
+ return (which);
+}
+
+static int
+gistnospace(Page p, IndexTuple it)
+{
+ return (PageGetFreeSpace(p) < IndexTupleSize(it));
+}
+
+void
+gistfreestack(GISTSTACK *s)
+{
+ GISTSTACK *p;
+
+ while (s != (GISTSTACK *) NULL) {
+ p = s->gs_parent;
+ pfree(s);
+ s = p;
+ }
+}
+
+
+/*
+** remove an entry from a page
+*/
+void
+gistdelete(Relation r, ItemPointer tid)
+{
+ BlockNumber blkno;
+ OffsetNumber offnum;
+ Buffer buf;
+ Page page;
+
+ /* must write-lock on delete */
+ RelationSetLockForWrite(r);
+
+ blkno = ItemPointerGetBlockNumber(tid);
+ offnum = ItemPointerGetOffsetNumber(tid);
+
+ /* adjust any scans that will be affected by this deletion */
+ gistadjscans(r, GISTOP_DEL, blkno, offnum);
+
+ /* delete the index tuple */
+ buf = ReadBuffer(r, blkno);
+ page = BufferGetPage(buf);
+
+ PageIndexTupleDelete(page, offnum);
+
+ WriteBuffer(buf);
+
+ /* XXX -- two-phase locking, don't release the write lock */
+}
+
+void
+initGISTstate(GISTSTATE *giststate, Relation index)
+{
+ RegProcedure consistent_proc, union_proc, compress_proc, decompress_proc;
+ RegProcedure penalty_proc, picksplit_proc, equal_proc;
+ func_ptr user_fn;
+ int pronargs;
+ HeapTuple htup;
+ IndexTupleForm itupform;
+
+ consistent_proc = index_getprocid(index, 1, GIST_CONSISTENT_PROC);
+ union_proc = index_getprocid(index, 1, GIST_UNION_PROC);
+ compress_proc = index_getprocid(index, 1, GIST_COMPRESS_PROC);
+ decompress_proc = index_getprocid(index, 1, GIST_DECOMPRESS_PROC);
+ penalty_proc = index_getprocid(index, 1, GIST_PENALTY_PROC);
+ picksplit_proc = index_getprocid(index, 1, GIST_PICKSPLIT_PROC);
+ equal_proc = index_getprocid(index, 1, GIST_EQUAL_PROC);
+ fmgr_info(consistent_proc, &user_fn, &pronargs);
+ giststate->consistentFn = user_fn;
+ fmgr_info(union_proc, &user_fn, &pronargs);
+ giststate->unionFn = user_fn;
+ fmgr_info(compress_proc, &user_fn, &pronargs);
+ giststate->compressFn = user_fn;
+ fmgr_info(decompress_proc, &user_fn, &pronargs);
+ giststate->decompressFn = user_fn;
+ fmgr_info(penalty_proc, &user_fn, &pronargs);
+ giststate->penaltyFn = user_fn;
+ fmgr_info(picksplit_proc, &user_fn, &pronargs);
+ giststate->picksplitFn = user_fn;
+ fmgr_info(equal_proc, &user_fn, &pronargs);
+ giststate->equalFn = user_fn;
+
+ /* see if key type is different from type of attribute being indexed */
+ htup = SearchSysCacheTuple(INDEXRELID, ObjectIdGetDatum(index->rd_id),
+ 0,0,0);
+ itupform = (IndexTupleForm)GETSTRUCT(htup);
+ if (!HeapTupleIsValid(htup))
+ elog(WARN, "initGISTstate: index %d not found", index->rd_id);
+ giststate->haskeytype = itupform->indhaskeytype;
+ if (giststate->haskeytype) {
+ /* key type is different -- is it byval? */
+ htup = SearchSysCacheTuple(ATTNUM,
+ ObjectIdGetDatum(itupform->indexrelid),
+ UInt16GetDatum(FirstOffsetNumber),
+ 0,0);
+ if (!HeapTupleIsValid(htup)) {
+ elog(WARN, "initGISTstate: no attribute tuple %d %d",
+ itupform->indexrelid, FirstOffsetNumber);
+ return;
+ }
+ giststate->keytypbyval = (((AttributeTupleForm)htup)->attbyval);
+ }
+ else
+ giststate->keytypbyval = FALSE;
+ return;
+}
+
+
+/*
+** Given an IndexTuple to be inserted on a page, this routine replaces
+** the key with another key, which may involve generating a new IndexTuple
+** if the sizes don't match
+*/
+static IndexTuple
+gist_tuple_replacekey(Relation r, GISTENTRY entry, IndexTuple t)
+{
+ char * datum = (((char *) t) + sizeof(IndexTupleData));
+
+ /* if new entry fits in index tuple, copy it in */
+ if (entry.bytes < IndexTupleSize(t) - sizeof(IndexTupleData)) {
+ memcpy(datum, entry.pred, entry.bytes);
+ /* clear out old size */
+ t->t_info &= 0xe000;
+ /* or in new size */
+ t->t_info |= MAXALIGN(entry.bytes + sizeof(IndexTupleData));
+
+ return(t);
+ }
+ else {
+ /* generate a new index tuple for the compressed entry */
+ TupleDesc tupDesc = r->rd_att;
+ IndexTuple newtup;
+ char *isnull;
+ int blank;
+
+ isnull = (char *) palloc(r->rd_rel->relnatts);
+ for (blank = 0; blank < r->rd_rel->relnatts; blank++)
+ isnull[blank] = ' ';
+ newtup = (IndexTuple) index_formtuple(tupDesc,
+ (Datum *)&(entry.pred),
+ isnull);
+ newtup->t_tid = t->t_tid;
+ pfree(isnull);
+ return(newtup);
+ }
+}
+
+
+/*
+** initialize a GiST entry with a decompressed version of pred
+*/
+void
+gistdentryinit(GISTSTATE *giststate, GISTENTRY *e, char *pr, Relation r,
+ Page pg, OffsetNumber o, int b, bool l)
+{
+ GISTENTRY *dep;
+ gistentryinit(*e, pr, r, pg, o, b, l);
+ if (giststate->haskeytype) {
+ dep = (GISTENTRY *)((giststate->decompressFn)(e));
+ gistentryinit(*e, dep->pred, dep->rel, dep->page, dep->offset, dep->bytes,
+ dep->leafkey);
+ if (dep != e) pfree(dep);
+ }
+}
+
+
+/*
+** initialize a GiST entry with a compressed version of pred
+*/
+void
+gistcentryinit(GISTSTATE *giststate, GISTENTRY *e, char *pr, Relation r,
+ Page pg, OffsetNumber o, int b, bool l)
+{
+ GISTENTRY *cep;
+ gistentryinit(*e, pr, r, pg, o, b, l);
+ if (giststate->haskeytype) {
+ cep = (GISTENTRY *)((giststate->compressFn)(e));
+ gistentryinit(*e, cep->pred, cep->rel, cep->page, cep->offset, cep->bytes,
+ cep->leafkey);
+ if (cep != e) pfree(cep);
+ }
+}
+
+
+
+#define GISTDEBUG
+#ifdef GISTDEBUG
+
+extern char *text_range_out();
+extern char *int_range_out();
+
+/*
+** sloppy debugging support routine, requires recompilation with appropriate
+** "out" method for the index keys. Could be fixed to find that info
+** in the catalogs...
+*/
+void
+_gistdump(Relation r)
+{
+ Buffer buf;
+ Page page;
+ OffsetNumber offnum, maxoff;
+ BlockNumber blkno;
+ BlockNumber nblocks;
+ GISTPageOpaque po;
+ IndexTuple itup;
+ BlockNumber itblkno;
+ OffsetNumber itoffno;
+ char *datum;
+ char *itkey;
+
+ nblocks = RelationGetNumberOfBlocks(r);
+ for (blkno = 0; blkno < nblocks; blkno++) {
+ buf = ReadBuffer(r, blkno);
+ page = BufferGetPage(buf);
+ po = (GISTPageOpaque) PageGetSpecialPointer(page);
+ maxoff = PageGetMaxOffsetNumber(page);
+ printf("Page %d maxoff %d <%s>\n", blkno, maxoff,
+ (po->flags & F_LEAF ? "LEAF" : "INTERNAL"));
+
+ if (PageIsEmpty(page)) {
+ ReleaseBuffer(buf);
+ continue;
+ }
+
+ for (offnum = FirstOffsetNumber;
+ offnum <= maxoff;
+ offnum = OffsetNumberNext(offnum)) {
+ itup = (IndexTuple) PageGetItem(page, PageGetItemId(page, offnum));
+ itblkno = ItemPointerGetBlockNumber(&(itup->t_tid));
+ itoffno = ItemPointerGetOffsetNumber(&(itup->t_tid));
+ datum = ((char *) itup);
+ datum += sizeof(IndexTupleData);
+ /* get out function for type of key, and out it! */
+ itkey = (char *) int_range_out(datum);
+ /* itkey = " unable to print"; */
+ printf("\t[%d] size %d heap <%d,%d> key:%s\n",
+ offnum, IndexTupleSize(itup), itblkno, itoffno, itkey);
+ pfree(itkey);
+ }
+
+ ReleaseBuffer(buf);
+ }
+}
+
+#define TRLOWER(tr) (((tr)->bytes))
+#define TRUPPER(tr) (&((tr)->bytes[MAXALIGN(VARSIZE(TRLOWER(tr)))]))
+typedef struct txtrange {
+ /* flag: NINF means that lower is negative infinity; PINF means that
+ ** upper is positive infinity. 0 means that both are numbers.
+ */
+ int32 vl_len;
+ int32 flag;
+ char bytes[2];
+} TXTRANGE;
+
+typedef struct intrange {
+ int lower;
+ int upper;
+ /* flag: NINF means that lower is negative infinity; PINF means that
+ ** upper is positive infinity. 0 means that both are numbers.
+ */
+ int flag;
+} INTRANGE;
+
+char *text_range_out(TXTRANGE *r)
+{
+ char *result;
+ char *lower, *upper;
+
+ if (r == NULL)
+ return(NULL);
+ result = (char *)palloc(16 + VARSIZE(TRLOWER(r)) + VARSIZE(TRUPPER(r))
+ - 2*VARHDRSZ);
+
+ lower = (char *)palloc(VARSIZE(TRLOWER(r)) + 1 - VARHDRSZ);
+ memcpy(lower, VARDATA(TRLOWER(r)), VARSIZE(TRLOWER(r)) - VARHDRSZ);
+ lower[VARSIZE(TRLOWER(r)) - VARHDRSZ] = '\0';
+ upper = (char *)palloc(VARSIZE(TRUPPER(r)) + 1 - VARHDRSZ);
+ memcpy(upper, VARDATA(TRUPPER(r)), VARSIZE(TRUPPER(r)) - VARHDRSZ);
+ upper[VARSIZE(TRUPPER(r)) - VARHDRSZ] = '\0';
+
+ (void) sprintf(result, "[%s,%s): %d", lower, upper, r->flag);
+ pfree(lower);
+ pfree(upper);
+ return(result);
+}
+
+char *
+int_range_out(INTRANGE *r)
+{
+ char *result;
+
+ if (r == NULL)
+ return(NULL);
+ result = (char *)palloc(80);
+ (void) sprintf(result, "[%d,%d): %d",r->lower, r->upper, r->flag);
+
+ return(result);
+}
+
+#endif /* defined GISTDEBUG */
+
diff --git a/src/backend/access/gist/gistget.c b/src/backend/access/gist/gistget.c
new file mode 100644
index 00000000000..d60b0a1194e
--- /dev/null
+++ b/src/backend/access/gist/gistget.c
@@ -0,0 +1,374 @@
+/*-------------------------------------------------------------------------
+ *
+ * gistget.c--
+ * fetch tuples from a GiST scan.
+ *
+ *
+ *
+ * IDENTIFICATION
+ * /usr/local/devel/pglite/cvs/src/backend/access/gisr/gistget.c,v 1.9 1995/08/01 20:16:02 jolly Exp
+ *
+ *-------------------------------------------------------------------------
+ */
+#include "postgres.h"
+
+#include "storage/bufmgr.h"
+#include "storage/bufpage.h"
+
+#include "utils/elog.h"
+#include "utils/palloc.h"
+#include "utils/rel.h"
+
+#include "access/heapam.h"
+#include "access/genam.h"
+#include "access/iqual.h"
+#include "access/gist.h"
+#include "access/sdir.h"
+
+#include "executor/execdebug.h"
+
+static OffsetNumber gistfindnext(IndexScanDesc s, Page p, OffsetNumber n,
+ ScanDirection dir);
+static RetrieveIndexResult gistscancache(IndexScanDesc s, ScanDirection dir);
+static RetrieveIndexResult gistfirst(IndexScanDesc s, ScanDirection dir);
+static RetrieveIndexResult gistnext(IndexScanDesc s, ScanDirection dir);
+static ItemPointer gistheapptr(Relation r, ItemPointer itemp);
+
+
+RetrieveIndexResult
+gistgettuple(IndexScanDesc s, ScanDirection dir)
+{
+ RetrieveIndexResult res;
+
+ /* if we have it cached in the scan desc, just return the value */
+ if ((res = gistscancache(s, dir)) != (RetrieveIndexResult) NULL)
+ return (res);
+
+ /* not cached, so we'll have to do some work */
+ if (ItemPointerIsValid(&(s->currentItemData))) {
+ res = gistnext(s, dir);
+ } else {
+ res = gistfirst(s, dir);
+ }
+ return (res);
+}
+
+static RetrieveIndexResult
+gistfirst(IndexScanDesc s, ScanDirection dir)
+{
+ Buffer b;
+ Page p;
+ OffsetNumber n;
+ OffsetNumber maxoff;
+ RetrieveIndexResult res;
+ GISTPageOpaque po;
+ GISTScanOpaque so;
+ GISTSTACK *stk;
+ BlockNumber blk;
+ IndexTuple it;
+ ItemPointer ip;
+
+ b = ReadBuffer(s->relation, GISTP_ROOT);
+ p = BufferGetPage(b);
+ po = (GISTPageOpaque) PageGetSpecialPointer(p);
+ so = (GISTScanOpaque) s->opaque;
+
+ for (;;) {
+ maxoff = PageGetMaxOffsetNumber(p);
+ if (ScanDirectionIsBackward(dir))
+ n = gistfindnext(s, p, maxoff, dir);
+ else
+ n = gistfindnext(s, p, FirstOffsetNumber, dir);
+
+ while (n < FirstOffsetNumber || n > maxoff) {
+
+ ReleaseBuffer(b);
+ if (so->s_stack == (GISTSTACK *) NULL)
+ return ((RetrieveIndexResult) NULL);
+
+ stk = so->s_stack;
+ b = ReadBuffer(s->relation, stk->gs_blk);
+ p = BufferGetPage(b);
+ po = (GISTPageOpaque) PageGetSpecialPointer(p);
+ maxoff = PageGetMaxOffsetNumber(p);
+
+ if (ScanDirectionIsBackward(dir)) {
+ n = OffsetNumberPrev(stk->gs_child);
+ } else {
+ n = OffsetNumberNext(stk->gs_child);
+ }
+ so->s_stack = stk->gs_parent;
+ pfree(stk);
+
+ n = gistfindnext(s, p, n, dir);
+ }
+ if (po->flags & F_LEAF) {
+ ItemPointerSet(&(s->currentItemData), BufferGetBlockNumber(b), n);
+
+ it = (IndexTuple) PageGetItem(p, PageGetItemId(p, n));
+ ip = (ItemPointer) palloc(sizeof(ItemPointerData));
+ memmove((char *) ip, (char *) &(it->t_tid),
+ sizeof(ItemPointerData));
+ ReleaseBuffer(b);
+
+ res = FormRetrieveIndexResult(&(s->currentItemData), ip);
+
+ return (res);
+ } else {
+ stk = (GISTSTACK *) palloc(sizeof(GISTSTACK));
+ stk->gs_child = n;
+ stk->gs_blk = BufferGetBlockNumber(b);
+ stk->gs_parent = so->s_stack;
+ so->s_stack = stk;
+
+ it = (IndexTuple) PageGetItem(p, PageGetItemId(p, n));
+ blk = ItemPointerGetBlockNumber(&(it->t_tid));
+
+ ReleaseBuffer(b);
+ b = ReadBuffer(s->relation, blk);
+ p = BufferGetPage(b);
+ po = (GISTPageOpaque) PageGetSpecialPointer(p);
+ }
+ }
+}
+
+static RetrieveIndexResult
+gistnext(IndexScanDesc s, ScanDirection dir)
+{
+ Buffer b;
+ Page p;
+ OffsetNumber n;
+ OffsetNumber maxoff;
+ RetrieveIndexResult res;
+ GISTPageOpaque po;
+ GISTScanOpaque so;
+ GISTSTACK *stk;
+ BlockNumber blk;
+ IndexTuple it;
+ ItemPointer ip;
+
+ blk = ItemPointerGetBlockNumber(&(s->currentItemData));
+ n = ItemPointerGetOffsetNumber(&(s->currentItemData));
+
+ if (ScanDirectionIsForward(dir)) {
+ n = OffsetNumberNext(n);
+ } else {
+ n = OffsetNumberPrev(n);
+ }
+
+ b = ReadBuffer(s->relation, blk);
+ p = BufferGetPage(b);
+ po = (GISTPageOpaque) PageGetSpecialPointer(p);
+ so = (GISTScanOpaque) s->opaque;
+
+ for (;;) {
+ maxoff = PageGetMaxOffsetNumber(p);
+ n = gistfindnext(s, p, n, dir);
+
+ while (n < FirstOffsetNumber || n > maxoff) {
+
+ ReleaseBuffer(b);
+ if (so->s_stack == (GISTSTACK *) NULL)
+ return ((RetrieveIndexResult) NULL);
+
+ stk = so->s_stack;
+ b = ReadBuffer(s->relation, stk->gs_blk);
+ p = BufferGetPage(b);
+ maxoff = PageGetMaxOffsetNumber(p);
+ po = (GISTPageOpaque) PageGetSpecialPointer(p);
+
+ if (ScanDirectionIsBackward(dir)) {
+ n = OffsetNumberPrev(stk->gs_child);
+ } else {
+ n = OffsetNumberNext(stk->gs_child);
+ }
+ so->s_stack = stk->gs_parent;
+ pfree(stk);
+
+ n = gistfindnext(s, p, n, dir);
+ }
+ if (po->flags & F_LEAF) {
+ ItemPointerSet(&(s->currentItemData), BufferGetBlockNumber(b), n);
+
+ it = (IndexTuple) PageGetItem(p, PageGetItemId(p, n));
+ ip = (ItemPointer) palloc(sizeof(ItemPointerData));
+ memmove((char *) ip, (char *) &(it->t_tid),
+ sizeof(ItemPointerData));
+ ReleaseBuffer(b);
+
+ res = FormRetrieveIndexResult(&(s->currentItemData), ip);
+
+ return (res);
+ } else {
+ stk = (GISTSTACK *) palloc(sizeof(GISTSTACK));
+ stk->gs_child = n;
+ stk->gs_blk = BufferGetBlockNumber(b);
+ stk->gs_parent = so->s_stack;
+ so->s_stack = stk;
+
+ it = (IndexTuple) PageGetItem(p, PageGetItemId(p, n));
+ blk = ItemPointerGetBlockNumber(&(it->t_tid));
+
+ ReleaseBuffer(b);
+ b = ReadBuffer(s->relation, blk);
+ p = BufferGetPage(b);
+ po = (GISTPageOpaque) PageGetSpecialPointer(p);
+
+ if (ScanDirectionIsBackward(dir)) {
+ n = PageGetMaxOffsetNumber(p);
+ } else {
+ n = FirstOffsetNumber;
+ }
+ }
+ }
+}
+
+/* Similar to index_keytest, but decompresses the key in the IndexTuple */
+bool
+gistindex_keytest(IndexTuple tuple,
+ TupleDesc tupdesc,
+ int scanKeySize,
+ ScanKey key,
+ GISTSTATE *giststate,
+ Relation r,
+ Page p,
+ OffsetNumber offset)
+{
+ bool isNull;
+ Datum datum;
+ int test;
+ GISTENTRY de;
+
+ IncrIndexProcessed();
+
+
+ while (scanKeySize > 0) {
+ datum = index_getattr(tuple,
+ 1,
+ tupdesc,
+ &isNull);
+ gistdentryinit(giststate, &de, (char *)datum, r, p, offset,
+ IndexTupleSize(tuple) - sizeof(IndexTupleData),
+ FALSE);
+
+ if (isNull) {
+ /* XXX eventually should check if SK_ISNULL */
+ return (false);
+ }
+
+ if (key[0].sk_flags & SK_COMMUTE) {
+ test = (int) (*(key[0].sk_func))
+ (DatumGetPointer(key[0].sk_argument),
+ &de, key[0].sk_procedure);
+ } else {
+ test = (int) (*(key[0].sk_func))
+ (&de,
+ DatumGetPointer(key[0].sk_argument),
+ key[0].sk_procedure);
+ }
+
+ if (!test == !(key[0].sk_flags & SK_NEGATE)) {
+ return (false);
+ }
+
+ scanKeySize -= 1;
+ key++;
+ }
+
+ return (true);
+}
+
+
+static OffsetNumber
+gistfindnext(IndexScanDesc s, Page p, OffsetNumber n, ScanDirection dir)
+{
+ OffsetNumber maxoff;
+ char *it;
+ GISTPageOpaque po;
+ GISTScanOpaque so;
+ GISTENTRY de;
+ GISTSTATE *giststate;
+
+ maxoff = PageGetMaxOffsetNumber(p);
+ po = (GISTPageOpaque) PageGetSpecialPointer(p);
+ so = (GISTScanOpaque) s->opaque;
+ giststate = so->giststate;
+
+ /*
+ * If we modified the index during the scan, we may have a pointer to
+ * a ghost tuple, before the scan. If this is the case, back up one.
+ */
+
+ if (so->s_flags & GS_CURBEFORE) {
+ so->s_flags &= ~GS_CURBEFORE;
+ n = OffsetNumberPrev(n);
+ }
+
+ while (n >= FirstOffsetNumber && n <= maxoff) {
+ it = (char *) PageGetItem(p, PageGetItemId(p, n));
+ if (gistindex_keytest((IndexTuple) it,
+ RelationGetTupleDescriptor(s->relation),
+ s->numberOfKeys, s->keyData, giststate,
+ s->relation, p, n))
+ break;
+
+ if (ScanDirectionIsBackward(dir)) {
+ n = OffsetNumberPrev(n);
+ } else {
+ n = OffsetNumberNext(n);
+ }
+ }
+
+ return (n);
+}
+
+static RetrieveIndexResult
+gistscancache(IndexScanDesc s, ScanDirection dir)
+{
+ RetrieveIndexResult res;
+ ItemPointer ip;
+
+ if (!(ScanDirectionIsNoMovement(dir)
+ && ItemPointerIsValid(&(s->currentItemData)))) {
+
+ return ((RetrieveIndexResult) NULL);
+ }
+
+ ip = gistheapptr(s->relation, &(s->currentItemData));
+
+ if (ItemPointerIsValid(ip))
+ res = FormRetrieveIndexResult(&(s->currentItemData), ip);
+ else
+ res = (RetrieveIndexResult) NULL;
+
+ return (res);
+}
+
+/*
+ * gistheapptr returns the item pointer to the tuple in the heap relation
+ * for which itemp is the index relation item pointer.
+ */
+static ItemPointer
+gistheapptr(Relation r, ItemPointer itemp)
+{
+ Buffer b;
+ Page p;
+ IndexTuple it;
+ ItemPointer ip;
+ OffsetNumber n;
+
+ ip = (ItemPointer) palloc(sizeof(ItemPointerData));
+ if (ItemPointerIsValid(itemp)) {
+ b = ReadBuffer(r, ItemPointerGetBlockNumber(itemp));
+ p = BufferGetPage(b);
+ n = ItemPointerGetOffsetNumber(itemp);
+ it = (IndexTuple) PageGetItem(p, PageGetItemId(p, n));
+ memmove((char *) ip, (char *) &(it->t_tid),
+ sizeof(ItemPointerData));
+ ReleaseBuffer(b);
+ } else {
+ ItemPointerSetInvalid(ip);
+ }
+
+ return (ip);
+}
diff --git a/src/backend/access/gist/gistold.c b/src/backend/access/gist/gistold.c
new file mode 100644
index 00000000000..6a43562c1d0
--- /dev/null
+++ b/src/backend/access/gist/gistold.c
@@ -0,0 +1,1159 @@
+/*-------------------------------------------------------------------------
+ *
+ * gist.c--
+ * interface routines for the postgres GiST indexed access method.
+ *
+ *
+ *
+ * IDENTIFICATION
+ * /usr/local/devel/pglite/cvs/src/backend/access/rtree/rtree.c,v 1.16 1995/08/01 20:16:03 jolly Exp
+ *
+ *-------------------------------------------------------------------------
+ */
+#include "postgres.h"
+
+#include "storage/bufmgr.h"
+#include "storage/bufpage.h"
+
+#include "utils/elog.h"
+#include "utils/palloc.h"
+#include "utils/rel.h"
+#include "utils/excid.h"
+
+#include "access/heapam.h"
+#include "access/genam.h"
+#include "access/gist.h"
+#include "access/gistscan.h"
+#include "access/funcindex.h"
+#include "access/tupdesc.h"
+
+#include "nodes/execnodes.h"
+#include "nodes/plannodes.h"
+
+#include "executor/executor.h"
+#include "executor/tuptable.h"
+
+#include "catalog/index.h"
+
+/* non-export function prototypes */
+static InsertIndexResult gistdoinsert(Relation r, IndexTuple itup,
+ GISTSTATE *GISTstate);
+static InsertIndexResult gistentryinsert(Relation r, GISTSTACK *stk,
+ IndexTuple tup,
+ GISTSTATE *giststate);
+static void gistentryinserttwo(Relation r, GISTSTACK *stk, IndexTuple ltup,
+ IndexTuple rtup, GISTSTATE *giststate);
+static void gistAdjustKeys(Relation r, GISTSTACK *stk, BlockNumber blk,
+ char *datum, int att_size, GISTSTATE *giststate);
+static void gistintinsert(Relation r, GISTSTACK *stk, IndexTuple ltup,
+ IndexTuple rtup, GISTSTATE *giststate);
+static InsertIndexResult gistSplit(Relation r, Buffer buffer,
+ GISTSTACK *stack, IndexTuple itup,
+ GISTSTATE *giststate);
+static void gistnewroot(Relation r, IndexTuple lt, IndexTuple rt);
+static void GISTInitBuffer(Buffer b, uint32 f);
+static BlockNumber gistChooseSubtree(Relation r, IndexTuple itup, int level,
+ GISTSTATE *giststate,
+ GISTSTACK **retstack, Buffer *leafbuf);
+static OffsetNumber gistchoose(Relation r, Page p, IndexTuple it,
+ GISTSTATE *giststate);
+static int gistnospace(Page p, IndexTuple it);
+void gistdelete(Relation r, ItemPointer tid);
+static IndexTuple gist_tuple_replacekey(Relation r, GISTENTRY entry, IndexTuple t);
+
+void
+gistbuild(Relation heap,
+ Relation index,
+ int natts,
+ AttrNumber *attnum,
+ IndexStrategy istrat,
+ uint16 pint,
+ Datum *params,
+ FuncIndexInfo *finfo,
+ PredInfo *predInfo)
+{
+ HeapScanDesc scan;
+ Buffer buffer;
+ AttrNumber i;
+ HeapTuple htup;
+ IndexTuple itup;
+ TupleDesc hd, id;
+ InsertIndexResult res;
+ Datum *d;
+ bool *nulls;
+ int nb, nh, ni;
+ ExprContext *econtext;
+ TupleTable tupleTable;
+ TupleTableSlot *slot;
+ Oid hrelid, irelid;
+ Node *pred, *oldPred;
+ GISTSTATE giststate;
+ GISTENTRY tmpentry;
+ bool *decompvec;
+
+ initGISTstate(&giststate, index);
+
+ /* GiSTs only know how to do stupid locking now */
+ RelationSetLockForWrite(index);
+
+ pred = predInfo->pred;
+ oldPred = predInfo->oldPred;
+
+ /*
+ * We expect to be called exactly once for any index relation.
+ * If that's not the case, big trouble's what we have.
+ */
+
+ if (oldPred == NULL && (nb = RelationGetNumberOfBlocks(index)) != 0)
+ elog(WARN, "%.16s already contains data", &(index->rd_rel->relname.data[0]));
+
+ /* initialize the root page (if this is a new index) */
+ if (oldPred == NULL) {
+ buffer = ReadBuffer(index, P_NEW);
+ GISTInitBuffer(buffer, F_LEAF);
+ WriteBuffer(buffer);
+ }
+
+ /* init the tuple descriptors and get set for a heap scan */
+ hd = RelationGetTupleDescriptor(heap);
+ id = RelationGetTupleDescriptor(index);
+ d = (Datum *)palloc(natts * sizeof (*d));
+ nulls = (bool *)palloc(natts * sizeof (*nulls));
+
+ /*
+ * If this is a predicate (partial) index, we will need to evaluate the
+ * predicate using ExecQual, which requires the current tuple to be in a
+ * slot of a TupleTable. In addition, ExecQual must have an ExprContext
+ * referring to that slot. Here, we initialize dummy TupleTable and
+ * ExprContext objects for this purpose. --Nels, Feb '92
+ */
+#ifndef OMIT_PARTIAL_INDEX
+ if (pred != NULL || oldPred != NULL) {
+ tupleTable = ExecCreateTupleTable(1);
+ slot = ExecAllocTableSlot(tupleTable);
+ econtext = makeNode(ExprContext);
+ FillDummyExprContext(econtext, slot, hd, buffer);
+ }
+#endif /* OMIT_PARTIAL_INDEX */
+ scan = heap_beginscan(heap, 0, NowTimeQual, 0, (ScanKey) NULL);
+ htup = heap_getnext(scan, 0, &buffer);
+
+ /* int the tuples as we insert them */
+ nh = ni = 0;
+
+ for (; HeapTupleIsValid(htup); htup = heap_getnext(scan, 0, &buffer)) {
+
+ nh++;
+
+ /*
+ * If oldPred != NULL, this is an EXTEND INDEX command, so skip
+ * this tuple if it was already in the existing partial index
+ */
+ if (oldPred != NULL) {
+#ifndef OMIT_PARTIAL_INDEX
+ /*SetSlotContents(slot, htup); */
+ slot->val = htup;
+ if (ExecQual((List*)oldPred, econtext) == true) {
+ ni++;
+ continue;
+ }
+#endif /* OMIT_PARTIAL_INDEX */
+ }
+
+ /* Skip this tuple if it doesn't satisfy the partial-index predicate */
+ if (pred != NULL) {
+#ifndef OMIT_PARTIAL_INDEX
+ /*SetSlotContents(slot, htup); */
+ slot->val = htup;
+ if (ExecQual((List*)pred, econtext) == false)
+ continue;
+#endif /* OMIT_PARTIAL_INDEX */
+ }
+
+ ni++;
+
+ /*
+ * For the current heap tuple, extract all the attributes
+ * we use in this index, and note which are null.
+ */
+
+ for (i = 1; i <= natts; i++) {
+ int attoff;
+ bool attnull;
+
+ /*
+ * Offsets are from the start of the tuple, and are
+ * zero-based; indices are one-based. The next call
+ * returns i - 1. That's data hiding for you.
+ */
+
+ attoff = AttrNumberGetAttrOffset(i);
+ /*
+ d[attoff] = HeapTupleGetAttributeValue(htup, buffer,
+ */
+ d[attoff] = GetIndexValue(htup,
+ hd,
+ attoff,
+ attnum,
+ finfo,
+ &attnull,
+ buffer);
+ nulls[attoff] = (attnull ? 'n' : ' ');
+ }
+
+ /* immediately compress keys, and generate an index tuple */
+ decompvec = (bool *)palloc(sizeof(bool) * natts);
+ for (i = 0; i < natts; i++) {
+ gistcentryinit(&giststate, &tmpentry, (char *)d[i], (Relation) NULL,
+ (Page) NULL, (OffsetNumber) 0,
+ -1 /* size is currently bogus */, TRUE);
+ if (d[i] != (Datum)tmpentry.pred && tmpentry.bytes > sizeof(int32))
+ decompvec[i] = TRUE;
+ else decompvec[i] = FALSE;
+ d[i] = (Datum)tmpentry.pred;
+ }
+
+ /* form an index tuple and point it at the heap tuple */
+ itup = index_formtuple(id, &d[0], nulls);
+ itup->t_tid = htup->t_ctid;
+
+ /*
+ * Since we already have the index relation locked, we
+ * call gistdoinsert directly. Normal access method calls
+ * dispatch through gistinsert, which locks the relation
+ * for write. This is the right thing to do if you're
+ * inserting single tups, but not when you're initializing
+ * the whole index at once.
+ */
+
+ res = gistdoinsert(index, itup, &giststate);
+ for (i = 0; i < natts; i++)
+ if (decompvec[i] == TRUE) pfree((char *)d[i]);
+ pfree(itup);
+ pfree(res);
+ }
+
+ /* okay, all heap tuples are indexed */
+ heap_endscan(scan);
+ RelationUnsetLockForWrite(index);
+
+ if (pred != NULL || oldPred != NULL) {
+#ifndef OMIT_PARTIAL_INDEX
+ ExecDestroyTupleTable(tupleTable, true);
+ pfree(econtext);
+#endif /* OMIT_PARTIAL_INDEX */
+ }
+
+ /*
+ * Since we just inted the tuples in the heap, we update its
+ * stats in pg_relation to guarantee that the planner takes
+ * advantage of the index we just created. UpdateStats() does a
+ * CommandinterIncrement(), which flushes changed entries from
+ * the system relcache. The act of constructing an index changes
+ * these heap and index tuples in the system catalogs, so they
+ * need to be flushed. We close them to guarantee that they
+ * will be.
+ */
+
+ hrelid = heap->rd_id;
+ irelid = index->rd_id;
+ heap_close(heap);
+ index_close(index);
+
+ UpdateStats(hrelid, nh, true);
+ UpdateStats(irelid, ni, false);
+
+ if (oldPred != NULL) {
+ if (ni == nh) pred = NULL;
+ UpdateIndexPredicate(irelid, oldPred, pred);
+ }
+
+ /* be tidy */
+ pfree(nulls);
+ pfree(d);
+}
+
+/*
+ * gistinsert -- wrapper for GiST tuple insertion.
+ *
+ * This is the public interface routine for tuple insertion in GiSTs.
+ * It doesn't do any work; just locks the relation and passes the buck.
+ */
+InsertIndexResult
+gistinsert(Relation r, Datum *datum, char *nulls, ItemPointer ht_ctid)
+{
+ InsertIndexResult res;
+ IndexTuple itup;
+ GISTSTATE giststate;
+ GISTENTRY tmpentry;
+ int i;
+ bool *decompvec;
+
+ initGISTstate(&giststate, r);
+
+ /* immediately compress keys, and generate an index tuple */
+ decompvec = (bool *)palloc(sizeof(bool) * r->rd_att->natts);
+ for (i = 0; i < r->rd_att->natts; i++) {
+ gistcentryinit(&giststate, &tmpentry, (char *)datum[i], (Relation)NULL,
+ (Page) NULL, (OffsetNumber) 0,
+ -1 /* size is currently bogus */, TRUE);
+ if (datum[i] != (Datum)tmpentry.pred && tmpentry.bytes > sizeof(int32))
+ decompvec[i] = TRUE;
+ else decompvec[i] = FALSE;
+ datum[i] = (Datum)tmpentry.pred;
+ }
+ itup = index_formtuple(RelationGetTupleDescriptor(r), datum, nulls);
+ itup->t_tid = *ht_ctid;
+
+ RelationSetLockForWrite(r);
+ res = gistdoinsert(r, itup, &giststate);
+ for (i = 0; i < r->rd_att->natts; i++)
+ if (decompvec[i] == TRUE) pfree((char *)datum[i]);
+ pfree(itup);
+
+ /* XXX two-phase locking -- don't unlock the relation until EOT */
+ return (res);
+}
+
+/* itup contains original uncompressed entry */
+static InsertIndexResult
+gistdoinsert(Relation r, IndexTuple itup, GISTSTATE *giststate)
+{
+ char *datum, *newdatum;
+ GISTENTRY entry, tmpentry;
+ InsertIndexResult res;
+ OffsetNumber l;
+ GISTSTACK *stack, *tmpstk;
+ Buffer buffer;
+ BlockNumber blk;
+ Page page;
+
+ /* 3rd arg is ignored for now */
+ blk = gistChooseSubtree(r, itup, 0, giststate, &stack, &buffer);
+ page = (Page) BufferGetPage(buffer);
+
+ if (gistnospace(page, itup)) {
+ /* need to do a split */
+ res = gistSplit(r, buffer, stack, itup, giststate);
+ gistfreestack(stack);
+ WriteBuffer(buffer); /* don't forget to release buffer! */
+ return (res);
+ }
+
+ /* add the item and write the buffer */
+ if (PageIsEmpty(page)) {
+ l = PageAddItem(page, (Item) itup, IndexTupleSize(itup),
+ FirstOffsetNumber,
+ LP_USED);
+ } else {
+ l = PageAddItem(page, (Item) itup, IndexTupleSize(itup),
+ OffsetNumberNext(PageGetMaxOffsetNumber(page)),
+ LP_USED);
+ }
+
+ WriteBuffer(buffer);
+
+ /* now expand the page boundary in the parent to include the new child */
+ datum = (((char *) itup) + sizeof(IndexTupleData));
+ gistdentryinit(giststate, &tmpentry, datum, (Relation)0, (Page)0,
+ (OffsetNumber)0,
+ IndexTupleSize(itup) - sizeof(IndexTupleData), FALSE);
+ gistAdjustKeys(r, stack, blk, tmpentry.pred, tmpentry.bytes, giststate);
+ gistfreestack(stack);
+ if (tmpentry.pred != datum)
+ pfree(tmpentry.pred);
+
+ /* build and return an InsertIndexResult for this insertion */
+ res = (InsertIndexResult) palloc(sizeof(InsertIndexResultData));
+ ItemPointerSet(&(res->pointerData), blk, l);
+
+ return (res);
+}
+
+/* itup contains compressed entry */
+static BlockNumber
+gistChooseSubtree(Relation r, IndexTuple itup, int level,
+ GISTSTATE *giststate,
+ GISTSTACK **retstack /*out*/,
+ Buffer *leafbuf /*out*/)
+{
+ Buffer buffer;
+ BlockNumber blk;
+ GISTSTACK *stack;
+ Page page;
+ GISTPageOpaque opaque;
+ IndexTuple which;
+
+ blk = GISTP_ROOT;
+ buffer = InvalidBuffer;
+ stack = (GISTSTACK *) NULL;
+
+ do {
+ /* let go of current buffer before getting next */
+ if (buffer != InvalidBuffer)
+ ReleaseBuffer(buffer);
+
+ /* get next buffer */
+ buffer = ReadBuffer(r, blk);
+ page = (Page) BufferGetPage(buffer);
+
+ opaque = (GISTPageOpaque) PageGetSpecialPointer(page);
+ if (!(opaque->flags & F_LEAF)) {
+ GISTSTACK *n;
+ ItemId iid;
+
+ n = (GISTSTACK *) palloc(sizeof(GISTSTACK));
+ n->gs_parent = stack;
+ n->gs_blk = blk;
+ n->gs_child = gistchoose(r, page, itup, giststate);
+ stack = n;
+
+ iid = PageGetItemId(page, n->gs_child);
+ which = (IndexTuple) PageGetItem(page, iid);
+ blk = ItemPointerGetBlockNumber(&(which->t_tid));
+ }
+ } while (!(opaque->flags & F_LEAF));
+
+ *retstack = stack;
+ *leafbuf = buffer;
+
+ return(blk);
+}
+
+/* datum is uncompressed */
+static void
+gistAdjustKeys(Relation r,
+ GISTSTACK *stk,
+ BlockNumber blk,
+ char *datum,
+ int att_size,
+ GISTSTATE *giststate)
+{
+ char *oldud;
+ Page p;
+ Buffer b;
+ bool result;
+ bytea *evec;
+ GISTENTRY centry, *ev0p, *ev1p, *dentryp;
+ int size, datumsize;
+ IndexTuple tid;
+
+ if (stk == (GISTSTACK *) NULL)
+ return;
+
+ b = ReadBuffer(r, stk->gs_blk);
+ p = BufferGetPage(b);
+
+ oldud = (char *) PageGetItem(p, PageGetItemId(p, stk->gs_child));
+ tid = (IndexTuple) oldud;
+ size = IndexTupleSize((IndexTuple)oldud) - sizeof(IndexTupleData);
+ oldud += sizeof(IndexTupleData);
+
+ evec = (bytea *) palloc(2*sizeof(GISTENTRY) + VARHDRSZ);
+ VARSIZE(evec) = 2*sizeof(GISTENTRY) + VARHDRSZ;
+
+ /* insert decompressed oldud into entry vector */
+ gistdentryinit(giststate, &((GISTENTRY *)VARDATA(evec))[0],
+ oldud, r, p, stk->gs_child,
+ size, FALSE);
+ ev0p = &((GISTENTRY *)VARDATA(evec))[0];
+
+ /* insert datum entry into entry vector */
+ gistentryinit(((GISTENTRY *)VARDATA(evec))[1], datum,
+ (Relation)NULL,(Page)NULL,(OffsetNumber)0, att_size, FALSE);
+ ev1p = &((GISTENTRY *)VARDATA(evec))[1];
+
+ /* form union of decompressed entries */
+ datum = (char *) (giststate->unionFn)(evec, &datumsize);
+
+ /* did union leave decompressed version of oldud unchanged? */
+ (giststate->equalFn)(ev0p->pred, datum, &result);
+ if (!result) {
+ TupleDesc td = RelationGetTupleDescriptor(r);
+
+ /* compress datum for storage on page */
+ gistcentryinit(giststate, ¢ry, datum, ev0p->rel, ev0p->page,
+ ev0p->offset, datumsize, FALSE);
+ if (td->attrs[0]->attlen >= 0) {
+ memmove(oldud, centry.pred, att_size);
+ gistAdjustKeys(r, stk->gs_parent, stk->gs_blk, datum, att_size,
+ giststate);
+ }
+ else if (VARSIZE(centry.pred) == VARSIZE(oldud)) {
+ memmove(oldud, centry.pred, VARSIZE(centry.pred));
+ gistAdjustKeys(r, stk->gs_parent, stk->gs_blk, datum, att_size,
+ giststate);
+ }
+ else {
+ /* new datum is not the same size as the old.
+ ** We have to delete the old entry and insert the new
+ ** one. Note that this may cause a split here!
+ */
+ IndexTuple newtup;
+ ItemPointerData oldtid;
+ char *isnull;
+ TupleDesc tupDesc;
+ InsertIndexResult res;
+
+ /* delete old tuple */
+ ItemPointerSet(&oldtid, stk->gs_blk, stk->gs_child);
+ gistdelete(r, (ItemPointer)&oldtid);
+
+ /* generate and insert new tuple */
+ tupDesc = r->rd_att;
+ isnull = (char *) palloc(r->rd_rel->relnatts);
+ memset(isnull, ' ', r->rd_rel->relnatts);
+ newtup = (IndexTuple) index_formtuple(tupDesc,
+ (Datum *) ¢ry.pred, isnull);
+ pfree(isnull);
+ /* set pointer in new tuple to point to current child */
+ ItemPointerSet(&oldtid, blk, 1);
+ newtup->t_tid = oldtid;
+
+ /* inserting the new entry also adjust keys above */
+ res = gistentryinsert(r, stk, newtup, giststate);
+
+ /* in stack, set info to point to new tuple */
+ stk->gs_blk = ItemPointerGetBlockNumber(&(res->pointerData));
+ stk->gs_child = ItemPointerGetOffsetNumber(&(res->pointerData));
+
+ pfree(res);
+ }
+ WriteBuffer(b);
+
+ if (centry.pred != datum)
+ pfree(datum);
+ }
+ else {
+ ReleaseBuffer(b);
+ }
+ pfree(evec);
+}
+
+/*
+ * gistSplit -- split a page in the tree.
+ *
+ */
+static InsertIndexResult
+gistSplit(Relation r,
+ Buffer buffer,
+ GISTSTACK *stack,
+ IndexTuple itup, /* contains compressed entry */
+ GISTSTATE *giststate)
+{
+ Page p;
+ Buffer leftbuf, rightbuf;
+ Page left, right;
+ ItemId itemid;
+ IndexTuple item;
+ IndexTuple ltup, rtup;
+ OffsetNumber maxoff;
+ OffsetNumber i;
+ OffsetNumber leftoff, rightoff;
+ BlockNumber lbknum, rbknum;
+ BlockNumber bufblock;
+ GISTPageOpaque opaque;
+ int blank;
+ InsertIndexResult res;
+ char *isnull;
+ GIST_SPLITVEC v;
+ TupleDesc tupDesc;
+ bytea *entryvec;
+ bool *decompvec;
+ IndexTuple item_1;
+ GISTENTRY tmpcentry, *tmpdentryp, tmpentry;
+ char *datum;
+
+ isnull = (char *) palloc(r->rd_rel->relnatts);
+ for (blank = 0; blank < r->rd_rel->relnatts; blank++)
+ isnull[blank] = ' ';
+ p = (Page) BufferGetPage(buffer);
+ opaque = (GISTPageOpaque) PageGetSpecialPointer(p);
+
+
+ /*
+ * The root of the tree is the first block in the relation. If
+ * we're about to split the root, we need to do some hocus-pocus
+ * to enforce this guarantee.
+ */
+
+ if (BufferGetBlockNumber(buffer) == GISTP_ROOT) {
+ leftbuf = ReadBuffer(r, P_NEW);
+ GISTInitBuffer(leftbuf, opaque->flags);
+ lbknum = BufferGetBlockNumber(leftbuf);
+ left = (Page) BufferGetPage(leftbuf);
+ } else {
+ leftbuf = buffer;
+ IncrBufferRefCount(buffer);
+ lbknum = BufferGetBlockNumber(buffer);
+ left = (Page) PageGetTempPage(p, sizeof(GISTPageOpaqueData));
+ }
+
+ rightbuf = ReadBuffer(r, P_NEW);
+ GISTInitBuffer(rightbuf, opaque->flags);
+ rbknum = BufferGetBlockNumber(rightbuf);
+ right = (Page) BufferGetPage(rightbuf);
+
+ /* generate the item array */
+ maxoff = PageGetMaxOffsetNumber(p);
+ entryvec = (bytea *)palloc(VARHDRSZ + (maxoff + 2) * sizeof(GISTENTRY));
+ decompvec = (bool *)palloc(VARHDRSZ + (maxoff + 2) * sizeof(bool));
+ for (i = FirstOffsetNumber; i <= maxoff; i = OffsetNumberNext(i)) {
+ item_1 = (IndexTuple) PageGetItem(p, PageGetItemId(p, i));
+ gistdentryinit(giststate, &((GISTENTRY *)VARDATA(entryvec))[i],
+ (((char *) item_1) + sizeof(IndexTupleData)),
+ r, p, i,
+ IndexTupleSize(item_1) - sizeof(IndexTupleData), FALSE);
+ if ((char *)(((GISTENTRY *)VARDATA(entryvec))[i].pred)
+ == (((char *) item_1) + sizeof(IndexTupleData)))
+ decompvec[i] = FALSE;
+ else decompvec[i] = TRUE;
+ }
+
+ /* add the new datum as the last entry */
+ gistdentryinit(giststate, &(((GISTENTRY *)VARDATA(entryvec))[maxoff+1]),
+ (((char *) itup) + sizeof(IndexTupleData)),
+ (Relation)NULL, (Page)NULL,
+ (OffsetNumber)0, tmpentry.bytes, FALSE);
+ if ((char *)(((GISTENTRY *)VARDATA(entryvec))[maxoff+1]).pred !=
+ (((char *) itup) + sizeof(IndexTupleData)))
+ decompvec[maxoff+1] = TRUE;
+ else decompvec[maxoff+1] = FALSE;
+
+ VARSIZE(entryvec) = (maxoff + 2) * sizeof(GISTENTRY) + VARHDRSZ;
+
+ /* now let the user-defined picksplit function set up the split vector */
+ (giststate->picksplitFn)(entryvec, &v);
+
+ /* compress ldatum and rdatum */
+ gistcentryinit(giststate, &tmpentry, v.spl_ldatum, (Relation)NULL,
+ (Page)NULL, (OffsetNumber)0,
+ ((GISTENTRY *)VARDATA(entryvec))[i].bytes, FALSE);
+ if (v.spl_ldatum != tmpentry.pred)
+ pfree(v.spl_ldatum);
+ v.spl_ldatum = tmpentry.pred;
+
+ gistcentryinit(giststate, &tmpentry, v.spl_rdatum, (Relation)NULL,
+ (Page)NULL, (OffsetNumber)0,
+ ((GISTENTRY *)VARDATA(entryvec))[i].bytes, FALSE);
+ if (v.spl_rdatum != tmpentry.pred)
+ pfree(v.spl_rdatum);
+ v.spl_rdatum = tmpentry.pred;
+
+ /* clean up the entry vector: its preds need to be deleted, too */
+ for (i = FirstOffsetNumber; i <= maxoff+1; i = OffsetNumberNext(i))
+ if (decompvec[i])
+ pfree(((GISTENTRY *)VARDATA(entryvec))[i].pred);
+ pfree(entryvec);
+ pfree(decompvec);
+
+ leftoff = rightoff = FirstOffsetNumber;
+ maxoff = PageGetMaxOffsetNumber(p);
+ for (i = FirstOffsetNumber; i <= maxoff; i = OffsetNumberNext(i)) {
+ itemid = PageGetItemId(p, i);
+ item = (IndexTuple) PageGetItem(p, itemid);
+
+ if (i == *(v.spl_left)) {
+ (void) PageAddItem(left, (Item) item, IndexTupleSize(item),
+ leftoff, LP_USED);
+ leftoff = OffsetNumberNext(leftoff);
+ v.spl_left++; /* advance in left split vector */
+ } else {
+ (void) PageAddItem(right, (Item) item, IndexTupleSize(item),
+ rightoff, LP_USED);
+ rightoff = OffsetNumberNext(rightoff);
+ v.spl_right++; /* advance in right split vector */
+ }
+ }
+
+ /* build an InsertIndexResult for this insertion */
+ res = (InsertIndexResult) palloc(sizeof(InsertIndexResultData));
+
+ /* now insert the new index tuple */
+ if (*(v.spl_left) != FirstOffsetNumber) {
+ (void) PageAddItem(left, (Item) itup, IndexTupleSize(itup),
+ leftoff, LP_USED);
+ leftoff = OffsetNumberNext(leftoff);
+ ItemPointerSet(&(res->pointerData), lbknum, leftoff);
+ } else {
+ (void) PageAddItem(right, (Item) itup, IndexTupleSize(itup),
+ rightoff, LP_USED);
+ rightoff = OffsetNumberNext(rightoff);
+ ItemPointerSet(&(res->pointerData), rbknum, rightoff);
+ }
+
+ if ((bufblock = BufferGetBlockNumber(buffer)) != GISTP_ROOT) {
+ PageRestoreTempPage(left, p);
+ }
+ WriteBuffer(leftbuf);
+ WriteBuffer(rightbuf);
+
+ /*
+ * Okay, the page is split. We have three things left to do:
+ *
+ * 1) Adjust any active scans on this index to cope with changes
+ * we introduced in its structure by splitting this page.
+ *
+ * 2) "Tighten" the bounding box of the pointer to the left
+ * page in the parent node in the tree, if any. Since we
+ * moved a bunch of stuff off the left page, we expect it
+ * to get smaller. This happens in the internal insertion
+ * routine.
+ *
+ * 3) Insert a pointer to the right page in the parent. This
+ * may cause the parent to split. If it does, we need to
+ * repeat steps one and two for each split node in the tree.
+ */
+
+ /* adjust active scans */
+ gistadjscans(r, GISTOP_SPLIT, bufblock, FirstOffsetNumber);
+
+ tupDesc = r->rd_att;
+
+ ltup = (IndexTuple) index_formtuple(tupDesc,
+ (Datum *) &(v.spl_ldatum), isnull);
+ rtup = (IndexTuple) index_formtuple(tupDesc,
+ (Datum *) &(v.spl_rdatum), isnull);
+ pfree(isnull);
+
+ /* set pointers to new child pages in the internal index tuples */
+ ItemPointerSet(&(ltup->t_tid), lbknum, 1);
+ ItemPointerSet(&(rtup->t_tid), rbknum, 1);
+
+ gistintinsert(r, stack, ltup, rtup, giststate);
+
+ pfree(ltup);
+ pfree(rtup);
+
+ return (res);
+}
+
+static void
+gistintinsert(Relation r,
+ GISTSTACK *stk,
+ IndexTuple ltup,
+ IndexTuple rtup,
+ GISTSTATE *giststate)
+{
+ IndexTuple old;
+ Buffer b;
+ Page p;
+ ItemPointerData ltid;
+
+ if (stk == (GISTSTACK *) NULL) {
+ gistnewroot(r, ltup, rtup);
+ return;
+ }
+
+ /* remove old left pointer, insert the 2 new entries */
+ ItemPointerSet(<id, stk->gs_blk, stk->gs_child);
+ gistdelete(r, (ItemPointer)<id);
+ gistentryinserttwo(r, stk, ltup, rtup, giststate);
+}
+
+static void
+gistentryinserttwo(Relation r, GISTSTACK *stk, IndexTuple ltup,
+ IndexTuple rtup, GISTSTATE *giststate)
+{
+ Buffer b;
+ Page p;
+ InsertIndexResult res;
+ OffsetNumber off;
+ bytea *evec;
+ char *datum;
+ int size;
+ GISTENTRY tmpentry;
+
+ b = ReadBuffer(r, stk->gs_blk);
+ p = BufferGetPage(b);
+
+ if (gistnospace(p, ltup)) {
+ res = gistSplit(r, b, stk->gs_parent, ltup, giststate);
+ WriteBuffer(b); /* don't forget to release buffer! - 01/31/94 */
+ pfree(res);
+ gistdoinsert(r, rtup, giststate);
+ } else {
+ (void) PageAddItem(p, (Item)ltup, IndexTupleSize(ltup),
+ InvalidOffsetNumber, LP_USED);
+ WriteBuffer(b);
+ datum = (((char *) ltup) + sizeof(IndexTupleData));
+ size = IndexTupleSize(ltup) - sizeof(IndexTupleData);
+ gistdentryinit(giststate, &tmpentry, datum, (Relation)0, (Page)0,
+ (OffsetNumber)0, size, 0);
+ gistAdjustKeys(r, stk->gs_parent, stk->gs_blk, tmpentry.pred,
+ tmpentry.bytes, giststate);
+ if (tmpentry.pred != datum)
+ pfree(tmpentry.pred);
+ (void)gistentryinsert(r, stk, rtup, giststate);
+ }
+}
+
+
+static InsertIndexResult
+gistentryinsert(Relation r, GISTSTACK *stk, IndexTuple tup,
+ GISTSTATE *giststate)
+{
+ Buffer b;
+ Page p;
+ InsertIndexResult res;
+ bytea *evec;
+ char *datum;
+ int size;
+ OffsetNumber off;
+ GISTENTRY tmpentry;
+
+ b = ReadBuffer(r, stk->gs_blk);
+ p = BufferGetPage(b);
+
+ if (gistnospace(p, tup)) {
+ res = gistSplit(r, b, stk->gs_parent, tup, giststate);
+ WriteBuffer(b); /* don't forget to release buffer! - 01/31/94 */
+ return(res);
+ }
+ else {
+ res = (InsertIndexResult) palloc(sizeof(InsertIndexResultData));
+ off = PageAddItem(p, (Item) tup, IndexTupleSize(tup),
+ InvalidOffsetNumber, LP_USED);
+ WriteBuffer(b);
+ ItemPointerSet(&(res->pointerData), stk->gs_blk, off);
+ datum = (((char *) tup) + sizeof(IndexTupleData));
+ size = IndexTupleSize(tup) - sizeof(IndexTupleData);
+ gistdentryinit(giststate, &tmpentry, datum, (Relation)0, (Page)0,
+ (OffsetNumber)0, size, 0);
+ gistAdjustKeys(r, stk->gs_parent, stk->gs_blk, tmpentry.pred,
+ tmpentry.bytes, giststate);
+ if (tmpentry.pred != datum)
+ pfree(tmpentry.pred);
+ return(res);
+ }
+}
+
+
+static void
+gistnewroot(Relation r, IndexTuple lt, IndexTuple rt)
+{
+ Buffer b;
+ Page p;
+
+ b = ReadBuffer(r, GISTP_ROOT);
+ GISTInitBuffer(b, 0);
+ p = BufferGetPage(b);
+ (void) PageAddItem(p, (Item) lt, IndexTupleSize(lt),
+ FirstOffsetNumber, LP_USED);
+ (void) PageAddItem(p, (Item) rt, IndexTupleSize(rt),
+ OffsetNumberNext(FirstOffsetNumber), LP_USED);
+ WriteBuffer(b);
+}
+
+static void
+GISTInitBuffer(Buffer b, uint32 f)
+{
+ GISTPageOpaque opaque;
+ Page page;
+ Size pageSize;
+
+ pageSize = BufferGetPageSize(b);
+
+ page = BufferGetPage(b);
+ memset(page, 0, (int) pageSize);
+ PageInit(page, pageSize, sizeof(GISTPageOpaqueData));
+
+ opaque = (GISTPageOpaque) PageGetSpecialPointer(page);
+ opaque->flags = f;
+}
+
+/* it contains compressed entry */
+static OffsetNumber
+gistchoose(Relation r, Page p, IndexTuple it, GISTSTATE *giststate)
+{
+ OffsetNumber maxoff;
+ OffsetNumber i;
+ char *ud, *id;
+ char *datum;
+ float usize, dsize;
+ OffsetNumber which;
+ float which_grow;
+ GISTENTRY entry, identry;
+ int size, idsize;
+
+ idsize = IndexTupleSize(it) - sizeof(IndexTupleData);
+ id = ((char *) it) + sizeof(IndexTupleData);
+ maxoff = PageGetMaxOffsetNumber(p);
+ which_grow = -1.0;
+ which = -1;
+
+ gistdentryinit(giststate,&identry,id,(Relation)NULL,(Page)NULL,
+ (OffsetNumber)0, idsize, FALSE);
+
+ for (i = FirstOffsetNumber; i <= maxoff; i = OffsetNumberNext(i)) {
+ datum = (char *) PageGetItem(p, PageGetItemId(p, i));
+ size = IndexTupleSize(datum) - sizeof(IndexTupleData);
+ datum += sizeof(IndexTupleData);
+ gistdentryinit(giststate,&entry,datum,r,p,i,size,FALSE);
+ (giststate->penaltyFn)(entry, identry, &usize);
+ if (which_grow < 0 || usize < which_grow) {
+ which = i;
+ which_grow = usize;
+ if (which_grow == 0)
+ break;
+ }
+ if (entry.pred != datum)
+ pfree(entry.pred);
+ }
+ if (identry.pred != id)
+ pfree(identry.pred);
+
+ return (which);
+}
+
+static int
+gistnospace(Page p, IndexTuple it)
+{
+ return (PageGetFreeSpace(p) < IndexTupleSize(it));
+}
+
+void
+gistfreestack(GISTSTACK *s)
+{
+ GISTSTACK *p;
+
+ while (s != (GISTSTACK *) NULL) {
+ p = s->gs_parent;
+ pfree(s);
+ s = p;
+ }
+}
+
+void
+gistdelete(Relation r, ItemPointer tid)
+{
+ BlockNumber blkno;
+ OffsetNumber offnum;
+ Buffer buf;
+ Page page;
+
+ /* must write-lock on delete */
+ RelationSetLockForWrite(r);
+
+ blkno = ItemPointerGetBlockNumber(tid);
+ offnum = ItemPointerGetOffsetNumber(tid);
+
+ /* adjust any scans that will be affected by this deletion */
+ gistadjscans(r, GISTOP_DEL, blkno, offnum);
+
+ /* delete the index tuple */
+ buf = ReadBuffer(r, blkno);
+ page = BufferGetPage(buf);
+
+ PageIndexTupleDelete(page, offnum);
+
+ WriteBuffer(buf);
+
+ /* XXX -- two-phase locking, don't release the write lock */
+}
+
+void
+initGISTstate(GISTSTATE *giststate, Relation index)
+{
+ RegProcedure consistent_proc, union_proc, compress_proc, decompress_proc;
+ RegProcedure penalty_proc, picksplit_proc, equal_proc;
+ func_ptr user_fn;
+ int pronargs;
+
+ consistent_proc = index_getprocid(index, 1, GIST_CONSISTENT_PROC);
+ union_proc = index_getprocid(index, 1, GIST_UNION_PROC);
+ compress_proc = index_getprocid(index, 1, GIST_COMPRESS_PROC);
+ decompress_proc = index_getprocid(index, 1, GIST_DECOMPRESS_PROC);
+ penalty_proc = index_getprocid(index, 1, GIST_PENALTY_PROC);
+ picksplit_proc = index_getprocid(index, 1, GIST_PICKSPLIT_PROC);
+ equal_proc = index_getprocid(index, 1, GIST_EQUAL_PROC);
+ fmgr_info(consistent_proc, &user_fn, &pronargs);
+ giststate->consistentFn = user_fn;
+ fmgr_info(union_proc, &user_fn, &pronargs);
+ giststate->unionFn = user_fn;
+ fmgr_info(compress_proc, &user_fn, &pronargs);
+ giststate->compressFn = user_fn;
+ fmgr_info(decompress_proc, &user_fn, &pronargs);
+ giststate->decompressFn = user_fn;
+ fmgr_info(penalty_proc, &user_fn, &pronargs);
+ giststate->penaltyFn = user_fn;
+ fmgr_info(picksplit_proc, &user_fn, &pronargs);
+ giststate->picksplitFn = user_fn;
+ fmgr_info(equal_proc, &user_fn, &pronargs);
+ giststate->equalFn = user_fn;
+ return;
+}
+
+static IndexTuple
+gist_tuple_replacekey(Relation r, GISTENTRY entry, IndexTuple t)
+{
+ char * datum = (((char *) t) + sizeof(IndexTupleData));
+
+ /* if new entry fits in index tuple, copy it in */
+ if (entry.bytes < IndexTupleSize(t) - sizeof(IndexTupleData)) {
+ memcpy(datum, entry.pred, entry.bytes);
+ /* clear out old size */
+ t->t_info &= 0xe000;
+ /* or in new size */
+ t->t_info |= MAXALIGN(entry.bytes + sizeof(IndexTupleData));
+
+ return(t);
+ }
+ else {
+ /* generate a new index tuple for the compressed entry */
+ TupleDesc tupDesc = r->rd_att;
+ IndexTuple newtup;
+ char *isnull;
+ int blank;
+
+ isnull = (char *) palloc(r->rd_rel->relnatts);
+ for (blank = 0; blank < r->rd_rel->relnatts; blank++)
+ isnull[blank] = ' ';
+ newtup = (IndexTuple) index_formtuple(tupDesc,
+ (Datum *)&(entry.pred),
+ isnull);
+ newtup->t_tid = t->t_tid;
+ pfree(isnull);
+ return(newtup);
+ }
+}
+
+
+void
+gistdentryinit(GISTSTATE *giststate, GISTENTRY *e, char *pr, Relation r,
+ Page pg, OffsetNumber o, int b, bool l)
+{
+ GISTENTRY *dep;
+ gistentryinit(*e, pr, r, pg, o, b, l);
+ dep = (GISTENTRY *)((giststate->decompressFn)(e));
+ gistentryinit(*e, dep->pred, dep->rel, dep->page, dep->offset, dep->bytes,
+ dep->leafkey);
+ if (dep != e) pfree(dep);
+}
+
+void
+gistcentryinit(GISTSTATE *giststate, GISTENTRY *e, char *pr, Relation r,
+ Page pg, OffsetNumber o, int b, bool l)
+{
+ GISTENTRY *cep;
+ gistentryinit(*e, pr, r, pg, o, b, l);
+ cep = (GISTENTRY *)((giststate->compressFn)(e));
+ gistentryinit(*e, cep->pred, cep->rel, cep->page, cep->offset, cep->bytes,
+ cep->leafkey);
+ if (cep != e) pfree(cep);
+}
+
+
+
+#define GISTDEBUG
+#ifdef GISTDEBUG
+
+extern char *text_range_out();
+extern char *int_range_out();
+void
+_gistdump(Relation r)
+{
+ Buffer buf;
+ Page page;
+ OffsetNumber offnum, maxoff;
+ BlockNumber blkno;
+ BlockNumber nblocks;
+ GISTPageOpaque po;
+ IndexTuple itup;
+ BlockNumber itblkno;
+ OffsetNumber itoffno;
+ char *datum;
+ char *itkey;
+
+ nblocks = RelationGetNumberOfBlocks(r);
+ for (blkno = 0; blkno < nblocks; blkno++) {
+ buf = ReadBuffer(r, blkno);
+ page = BufferGetPage(buf);
+ po = (GISTPageOpaque) PageGetSpecialPointer(page);
+ maxoff = PageGetMaxOffsetNumber(page);
+ printf("Page %d maxoff %d <%s>\n", blkno, maxoff,
+ (po->flags & F_LEAF ? "LEAF" : "INTERNAL"));
+
+ if (PageIsEmpty(page)) {
+ ReleaseBuffer(buf);
+ continue;
+ }
+
+ for (offnum = FirstOffsetNumber;
+ offnum <= maxoff;
+ offnum = OffsetNumberNext(offnum)) {
+ itup = (IndexTuple) PageGetItem(page, PageGetItemId(page, offnum));
+ itblkno = ItemPointerGetBlockNumber(&(itup->t_tid));
+ itoffno = ItemPointerGetOffsetNumber(&(itup->t_tid));
+ datum = ((char *) itup);
+ datum += sizeof(IndexTupleData);
+ /* get out function for type of key, and out it! */
+ itkey = (char *) int_range_out(datum);
+ /* itkey = " unable to print"; */
+ printf("\t[%d] size %d heap <%d,%d> key:%s\n",
+ offnum, IndexTupleSize(itup), itblkno, itoffno, itkey);
+ pfree(itkey);
+ }
+
+ ReleaseBuffer(buf);
+ }
+}
+
+#define TRLOWER(tr) (((tr)->bytes))
+#define TRUPPER(tr) (&((tr)->bytes[MAXALIGN(VARSIZE(TRLOWER(tr)))]))
+typedef struct txtrange {
+ /* flag: NINF means that lower is negative infinity; PINF means that
+ ** upper is positive infinity. 0 means that both are numbers.
+ */
+ int32 vl_len;
+ int32 flag;
+ char bytes[2];
+} TXTRANGE;
+
+typedef struct intrange {
+ int lower;
+ int upper;
+ /* flag: NINF means that lower is negative infinity; PINF means that
+ ** upper is positive infinity. 0 means that both are numbers.
+ */
+ int flag;
+} INTRANGE;
+
+char *text_range_out(TXTRANGE *r)
+{
+ char *result;
+ char *lower, *upper;
+
+ if (r == NULL)
+ return(NULL);
+ result = (char *)palloc(16 + VARSIZE(TRLOWER(r)) + VARSIZE(TRUPPER(r))
+ - 2*VARHDRSZ);
+
+ lower = (char *)palloc(VARSIZE(TRLOWER(r)) + 1 - VARHDRSZ);
+ memcpy(lower, VARDATA(TRLOWER(r)), VARSIZE(TRLOWER(r)) - VARHDRSZ);
+ lower[VARSIZE(TRLOWER(r)) - VARHDRSZ] = '\0';
+ upper = (char *)palloc(VARSIZE(TRUPPER(r)) + 1 - VARHDRSZ);
+ memcpy(upper, VARDATA(TRUPPER(r)), VARSIZE(TRUPPER(r)) - VARHDRSZ);
+ upper[VARSIZE(TRUPPER(r)) - VARHDRSZ] = '\0';
+
+ (void) sprintf(result, "[%s,%s): %d", lower, upper, r->flag);
+ pfree(lower);
+ pfree(upper);
+ return(result);
+}
+
+char *
+int_range_out(INTRANGE *r)
+{
+ char *result;
+
+ if (r == NULL)
+ return(NULL);
+ result = (char *)palloc(80);
+ (void) sprintf(result, "[%d,%d): %d",r->lower, r->upper, r->flag);
+
+ return(result);
+}
+
+#endif /* defined GISTDEBUG */
+
diff --git a/src/backend/access/gist/gistscan.c b/src/backend/access/gist/gistscan.c
new file mode 100644
index 00000000000..f09c52019b1
--- /dev/null
+++ b/src/backend/access/gist/gistscan.c
@@ -0,0 +1,382 @@
+/*-------------------------------------------------------------------------
+ *
+ * gistscan.c--
+ * routines to manage scans on index relations
+ *
+ *
+ * IDENTIFICATION
+ * /usr/local/devel/pglite/cvs/src/backend/access/gist/gistscan.c,v 1.7 1995/06/14 00:10:05 jolly Exp
+ *
+ *-------------------------------------------------------------------------
+ */
+#include "c.h"
+#include "postgres.h"
+
+#include "storage/bufmgr.h"
+#include "storage/bufpage.h"
+
+#include "utils/elog.h"
+#include "utils/palloc.h"
+#include "utils/rel.h"
+
+#include "access/heapam.h"
+#include "access/genam.h"
+#include "access/gist.h"
+#include "access/giststrat.h"
+
+/* routines defined and used here */
+static void gistregscan(IndexScanDesc s);
+static void gistdropscan(IndexScanDesc s);
+static void gistadjone(IndexScanDesc s, int op, BlockNumber blkno,
+ OffsetNumber offnum);
+static void adjuststack(GISTSTACK *stk, BlockNumber blkno,
+ OffsetNumber offnum);
+static void adjustiptr(IndexScanDesc s, ItemPointer iptr,
+ int op, BlockNumber blkno, OffsetNumber offnum);
+
+/*
+ * Whenever we start a GiST scan in a backend, we register it in private
+ * space. Then if the GiST index gets updated, we check all registered
+ * scans and adjust them if the tuple they point at got moved by the
+ * update. We only need to do this in private space, because when we update
+ * an GiST we have a write lock on the tree, so no other process can have
+ * any locks at all on it. A single transaction can have write and read
+ * locks on the same object, so that's why we need to handle this case.
+ */
+
+typedef struct GISTScanListData {
+ IndexScanDesc gsl_scan;
+ struct GISTScanListData *gsl_next;
+} GISTScanListData;
+
+typedef GISTScanListData *GISTScanList;
+
+/* pointer to list of local scans on GiSTs */
+static GISTScanList GISTScans = (GISTScanList) NULL;
+
+IndexScanDesc
+gistbeginscan(Relation r,
+ bool fromEnd,
+ uint16 nkeys,
+ ScanKey key)
+{
+ IndexScanDesc s;
+
+ RelationSetLockForRead(r);
+ s = RelationGetIndexScan(r, fromEnd, nkeys, key);
+ gistregscan(s);
+
+ return (s);
+}
+
+void
+gistrescan(IndexScanDesc s, bool fromEnd, ScanKey key)
+{
+ GISTScanOpaque p;
+ int i;
+
+ if (!IndexScanIsValid(s)) {
+ elog(WARN, "gistrescan: invalid scan.");
+ return;
+ }
+
+ /*
+ * Clear all the pointers.
+ */
+
+ ItemPointerSetInvalid(&s->previousItemData);
+ ItemPointerSetInvalid(&s->currentItemData);
+ ItemPointerSetInvalid(&s->nextItemData);
+ ItemPointerSetInvalid(&s->previousMarkData);
+ ItemPointerSetInvalid(&s->currentMarkData);
+ ItemPointerSetInvalid(&s->nextMarkData);
+
+ /*
+ * Set flags.
+ */
+ if (RelationGetNumberOfBlocks(s->relation) == 0) {
+ s->flags = ScanUnmarked;
+ } else if (fromEnd) {
+ s->flags = ScanUnmarked | ScanUncheckedPrevious;
+ } else {
+ s->flags = ScanUnmarked | ScanUncheckedNext;
+ }
+
+ s->scanFromEnd = fromEnd;
+
+ if (s->numberOfKeys > 0) {
+ memmove(s->keyData,
+ key,
+ s->numberOfKeys * sizeof(ScanKeyData));
+ }
+
+ p = (GISTScanOpaque) s->opaque;
+ if (p != (GISTScanOpaque) NULL) {
+ freestack(p->s_stack);
+ freestack(p->s_markstk);
+ p->s_stack = p->s_markstk = (GISTSTACK *) NULL;
+ p->s_flags = 0x0;
+ } else {
+ /* initialize opaque data */
+ p = (GISTScanOpaque) palloc(sizeof(GISTScanOpaqueData));
+ p->s_stack = p->s_markstk = (GISTSTACK *) NULL;
+ p->s_flags = 0x0;
+ s->opaque = p;
+ p->giststate = (GISTSTATE *)palloc(sizeof(GISTSTATE));
+ initGISTstate(p->giststate, s->relation);
+ if (s->numberOfKeys > 0)
+ /*
+ ** Play games here with the scan key to use the Consistent
+ ** function for all comparisons:
+ ** 1) the sk_procedure field will now be used to hold the
+ ** strategy number
+ ** 2) the sk_func field will point to the Consistent function
+ */
+ for (i = 0; i < s->numberOfKeys; i++) {
+ /* s->keyData[i].sk_procedure
+ = index_getprocid(s->relation, 1, GIST_CONSISTENT_PROC); */
+ s->keyData[i].sk_procedure
+ = RelationGetGISTStrategy(s->relation, s->keyData[i].sk_attno,
+ s->keyData[i].sk_procedure);
+ s->keyData[i].sk_func = p->giststate->consistentFn;
+ }
+ }
+}
+
+void
+gistmarkpos(IndexScanDesc s)
+{
+ GISTScanOpaque p;
+ GISTSTACK *o, *n, *tmp;
+
+ s->currentMarkData = s->currentItemData;
+ p = (GISTScanOpaque) s->opaque;
+ if (p->s_flags & GS_CURBEFORE)
+ p->s_flags |= GS_MRKBEFORE;
+ else
+ p->s_flags &= ~GS_MRKBEFORE;
+
+ o = (GISTSTACK *) NULL;
+ n = p->s_stack;
+
+ /* copy the parent stack from the current item data */
+ while (n != (GISTSTACK *) NULL) {
+ tmp = (GISTSTACK *) palloc(sizeof(GISTSTACK));
+ tmp->gs_child = n->gs_child;
+ tmp->gs_blk = n->gs_blk;
+ tmp->gs_parent = o;
+ o = tmp;
+ n = n->gs_parent;
+ }
+
+ freestack(p->s_markstk);
+ p->s_markstk = o;
+}
+
+void
+gistrestrpos(IndexScanDesc s)
+{
+ GISTScanOpaque p;
+ GISTSTACK *o, *n, *tmp;
+
+ s->currentItemData = s->currentMarkData;
+ p = (GISTScanOpaque) s->opaque;
+ if (p->s_flags & GS_MRKBEFORE)
+ p->s_flags |= GS_CURBEFORE;
+ else
+ p->s_flags &= ~GS_CURBEFORE;
+
+ o = (GISTSTACK *) NULL;
+ n = p->s_markstk;
+
+ /* copy the parent stack from the current item data */
+ while (n != (GISTSTACK *) NULL) {
+ tmp = (GISTSTACK *) palloc(sizeof(GISTSTACK));
+ tmp->gs_child = n->gs_child;
+ tmp->gs_blk = n->gs_blk;
+ tmp->gs_parent = o;
+ o = tmp;
+ n = n->gs_parent;
+ }
+
+ freestack(p->s_stack);
+ p->s_stack = o;
+}
+
+void
+gistendscan(IndexScanDesc s)
+{
+ GISTScanOpaque p;
+
+ p = (GISTScanOpaque) s->opaque;
+
+ if (p != (GISTScanOpaque) NULL) {
+ freestack(p->s_stack);
+ freestack(p->s_markstk);
+ }
+
+ gistdropscan(s);
+ /* XXX don't unset read lock -- two-phase locking */
+}
+
+static void
+gistregscan(IndexScanDesc s)
+{
+ GISTScanList l;
+
+ l = (GISTScanList) palloc(sizeof(GISTScanListData));
+ l->gsl_scan = s;
+ l->gsl_next = GISTScans;
+ GISTScans = l;
+}
+
+static void
+gistdropscan(IndexScanDesc s)
+{
+ GISTScanList l;
+ GISTScanList prev;
+
+ prev = (GISTScanList) NULL;
+
+ for (l = GISTScans;
+ l != (GISTScanList) NULL && l->gsl_scan != s;
+ l = l->gsl_next) {
+ prev = l;
+ }
+
+ if (l == (GISTScanList) NULL)
+ elog(WARN, "GiST scan list corrupted -- cannot find 0x%lx", s);
+
+ if (prev == (GISTScanList) NULL)
+ GISTScans = l->gsl_next;
+ else
+ prev->gsl_next = l->gsl_next;
+
+ pfree(l);
+}
+
+void
+gistadjscans(Relation r, int op, BlockNumber blkno, OffsetNumber offnum)
+{
+ GISTScanList l;
+ Oid relid;
+
+ relid = r->rd_id;
+ for (l = GISTScans; l != (GISTScanList) NULL; l = l->gsl_next) {
+ if (l->gsl_scan->relation->rd_id == relid)
+ gistadjone(l->gsl_scan, op, blkno, offnum);
+ }
+}
+
+/*
+ * gistadjone() -- adjust one scan for update.
+ *
+ * By here, the scan passed in is on a modified relation. Op tells
+ * us what the modification is, and blkno and offind tell us what
+ * block and offset index were affected. This routine checks the
+ * current and marked positions, and the current and marked stacks,
+ * to see if any stored location needs to be changed because of the
+ * update. If so, we make the change here.
+ */
+static void
+gistadjone(IndexScanDesc s,
+ int op,
+ BlockNumber blkno,
+ OffsetNumber offnum)
+{
+ GISTScanOpaque so;
+
+ adjustiptr(s, &(s->currentItemData), op, blkno, offnum);
+ adjustiptr(s, &(s->currentMarkData), op, blkno, offnum);
+
+ so = (GISTScanOpaque) s->opaque;
+
+ if (op == GISTOP_SPLIT) {
+ adjuststack(so->s_stack, blkno, offnum);
+ adjuststack(so->s_markstk, blkno, offnum);
+ }
+}
+
+/*
+ * adjustiptr() -- adjust current and marked item pointers in the scan
+ *
+ * Depending on the type of update and the place it happened, we
+ * need to do nothing, to back up one record, or to start over on
+ * the same page.
+ */
+static void
+adjustiptr(IndexScanDesc s,
+ ItemPointer iptr,
+ int op,
+ BlockNumber blkno,
+ OffsetNumber offnum)
+{
+ OffsetNumber curoff;
+ GISTScanOpaque so;
+
+ if (ItemPointerIsValid(iptr)) {
+ if (ItemPointerGetBlockNumber(iptr) == blkno) {
+ curoff = ItemPointerGetOffsetNumber(iptr);
+ so = (GISTScanOpaque) s->opaque;
+
+ switch (op) {
+ case GISTOP_DEL:
+ /* back up one if we need to */
+ if (curoff >= offnum) {
+
+ if (curoff > FirstOffsetNumber) {
+ /* just adjust the item pointer */
+ ItemPointerSet(iptr, blkno, OffsetNumberPrev(curoff));
+ } else {
+ /* remember that we're before the current tuple */
+ ItemPointerSet(iptr, blkno, FirstOffsetNumber);
+ if (iptr == &(s->currentItemData))
+ so->s_flags |= GS_CURBEFORE;
+ else
+ so->s_flags |= GS_MRKBEFORE;
+ }
+ }
+ break;
+
+ case GISTOP_SPLIT:
+ /* back to start of page on split */
+ ItemPointerSet(iptr, blkno, FirstOffsetNumber);
+ if (iptr == &(s->currentItemData))
+ so->s_flags &= ~GS_CURBEFORE;
+ else
+ so->s_flags &= ~GS_MRKBEFORE;
+ break;
+
+ default:
+ elog(WARN, "Bad operation in GiST scan adjust: %d", op);
+ }
+ }
+ }
+}
+
+/*
+ * adjuststack() -- adjust the supplied stack for a split on a page in
+ * the index we're scanning.
+ *
+ * If a page on our parent stack has split, we need to back up to the
+ * beginning of the page and rescan it. The reason for this is that
+ * the split algorithm for GiSTs doesn't order tuples in any useful
+ * way on a single page. This means on that a split, we may wind up
+ * looking at some heap tuples more than once. This is handled in the
+ * access method update code for heaps; if we've modified the tuple we
+ * are looking at already in this transaction, we ignore the update
+ * request.
+ */
+/*ARGSUSED*/
+static void
+adjuststack(GISTSTACK *stk,
+ BlockNumber blkno,
+ OffsetNumber offnum)
+{
+ while (stk != (GISTSTACK *) NULL) {
+ if (stk->gs_blk == blkno)
+ stk->gs_child = FirstOffsetNumber;
+
+ stk = stk->gs_parent;
+ }
+}
diff --git a/src/backend/access/gist/giststrat.c b/src/backend/access/gist/giststrat.c
new file mode 100644
index 00000000000..1dea1946d9b
--- /dev/null
+++ b/src/backend/access/gist/giststrat.c
@@ -0,0 +1,119 @@
+/*-------------------------------------------------------------------------
+ *
+ * giststrat.c--
+ * strategy map data for GiSTs.
+ *
+ * Copyright (c) 1994, Regents of the University of California
+ *
+ *
+ * IDENTIFICATION
+ * /usr/local/devel/pglite/cvs/src/backend/access/gist/giststrat.c,v 1.4 1995/06/14 00:10:05 jolly Exp
+ *
+ *-------------------------------------------------------------------------
+ */
+#include "c.h"
+
+#include "utils/rel.h"
+
+#include "storage/bufmgr.h"
+#include "storage/bufpage.h"
+
+#include "access/istrat.h"
+#include "access/gist.h"
+
+/*
+ * Note: negate, commute, and negatecommute all assume that operators are
+ * ordered as follows in the strategy map:
+ *
+ * contains, contained-by
+ *
+ * The negate, commute, and negatecommute arrays are used by the planner
+ * to plan indexed scans over data that appears in the qualificiation in
+ * a boolean negation, or whose operands appear in the wrong order. For
+ * example, if the operator "<%" means "contains", and the user says
+ *
+ * where not rel.box <% "(10,10,20,20)"::box
+ *
+ * the planner can plan an index scan by noting that GiST indices have
+ * an operator in their operator class for negating <%.
+ *
+ * Similarly, if the user says something like
+ *
+ * where "(10,10,20,20)"::box <% rel.box
+ *
+ * the planner can see that the GiST index on rel.box has an operator in
+ * its opclass for commuting <%, and plan the scan using that operator.
+ * This added complexity in the access methods makes the planner a lot easier
+ * to write.
+ */
+
+/* if a op b, what operator tells us if (not a op b)? */
+static StrategyNumber GISTNegate[GISTNStrategies] = {
+ InvalidStrategy,
+ InvalidStrategy,
+ InvalidStrategy
+ };
+
+/* if a op_1 b, what is the operator op_2 such that b op_2 a? */
+static StrategyNumber GISTCommute[GISTNStrategies] = {
+ InvalidStrategy,
+ InvalidStrategy,
+ InvalidStrategy
+ };
+
+/* if a op_1 b, what is the operator op_2 such that (b !op_2 a)? */
+static StrategyNumber GISTNegateCommute[GISTNStrategies] = {
+ InvalidStrategy,
+ InvalidStrategy,
+ InvalidStrategy
+ };
+
+/*
+ * GiSTs do not currently support TermData (see rtree/rtstrat.c for
+ * discussion of
+ * TermData) -- such logic must be encoded in the user's Consistent function.
+ */
+
+/*
+ * If you were sufficiently attentive to detail, you would go through
+ * the ExpressionData pain above for every one of the strategies
+ * we defined. I am not. Now we declare the StrategyEvaluationData
+ * structure that gets shipped around to help the planner and the access
+ * method decide what sort of scan it should do, based on (a) what the
+ * user asked for, (b) what operators are defined for a particular opclass,
+ * and (c) the reams of information we supplied above.
+ *
+ * The idea of all of this initialized data is to make life easier on the
+ * user when he defines a new operator class to use this access method.
+ * By filling in all the data, we let him get away with leaving holes in his
+ * operator class, and still let him use the index. The added complexity
+ * in the access methods just isn't worth the trouble, though.
+ */
+
+static StrategyEvaluationData GISTEvaluationData = {
+ GISTNStrategies, /* # of strategies */
+ (StrategyTransformMap) GISTNegate, /* how to do (not qual) */
+ (StrategyTransformMap) GISTCommute, /* how to swap operands */
+ (StrategyTransformMap) GISTNegateCommute, /* how to do both */
+ NULL
+};
+
+StrategyNumber
+RelationGetGISTStrategy(Relation r,
+ AttrNumber attnum,
+ RegProcedure proc)
+{
+ return (RelationGetStrategy(r, attnum, &GISTEvaluationData, proc));
+}
+
+bool
+RelationInvokeGISTStrategy(Relation r,
+ AttrNumber attnum,
+ StrategyNumber s,
+ Datum left,
+ Datum right)
+{
+ return (RelationInvokeStrategy(r, &GISTEvaluationData, attnum, s,
+ left, right));
+}
+