588 lines
15 KiB
C
588 lines
15 KiB
C
/*-------------------------------------------------------------------------
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*
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* rtree_gist.c
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* pg_amproc entries for GiSTs over 2-D boxes.
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* This gives R-tree behavior, with Guttman's poly-time split algorithm.
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*
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/contrib/rtree_gist/Attic/rtree_gist.c,v 1.7 2003/07/27 17:10:06 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#include "postgres.h"
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#include "access/gist.h"
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#include "access/itup.h"
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#include "access/rtree.h"
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#include "utils/geo_decls.h"
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typedef Datum (*RDF) (PG_FUNCTION_ARGS);
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typedef Datum (*BINARY_UNION) (Datum, Datum, int *);
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typedef float (*SIZE_BOX) (Datum);
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/*
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** box ops
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*/
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PG_FUNCTION_INFO_V1(gbox_compress);
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PG_FUNCTION_INFO_V1(gbox_union);
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PG_FUNCTION_INFO_V1(gbox_picksplit);
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PG_FUNCTION_INFO_V1(gbox_consistent);
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PG_FUNCTION_INFO_V1(gbox_penalty);
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PG_FUNCTION_INFO_V1(gbox_same);
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Datum gbox_compress(PG_FUNCTION_ARGS);
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Datum gbox_union(PG_FUNCTION_ARGS);
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Datum gbox_picksplit(PG_FUNCTION_ARGS);
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Datum gbox_consistent(PG_FUNCTION_ARGS);
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Datum gbox_penalty(PG_FUNCTION_ARGS);
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Datum gbox_same(PG_FUNCTION_ARGS);
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static bool gbox_leaf_consistent(BOX *key, BOX *query, StrategyNumber strategy);
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static float size_box(Datum box);
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/*
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** Polygon ops
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*/
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PG_FUNCTION_INFO_V1(gpoly_compress);
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PG_FUNCTION_INFO_V1(gpoly_consistent);
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Datum gpoly_compress(PG_FUNCTION_ARGS);
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Datum gpoly_consistent(PG_FUNCTION_ARGS);
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/*
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** Common rtree-function (for all ops)
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*/
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static bool rtree_internal_consistent(BOX *key, BOX *query, StrategyNumber strategy);
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PG_FUNCTION_INFO_V1(rtree_decompress);
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Datum rtree_decompress(PG_FUNCTION_ARGS);
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/**************************************************
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* Box ops
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**************************************************/
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/*
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** The GiST Consistent method for boxes
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** Should return false if for all data items x below entry,
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** the predicate x op query == FALSE, where op is the oper
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** corresponding to strategy in the pg_amop table.
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*/
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Datum
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gbox_consistent(PG_FUNCTION_ARGS)
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{
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GISTENTRY *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
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BOX *query = (BOX *) PG_GETARG_POINTER(1);
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StrategyNumber strategy = (StrategyNumber) PG_GETARG_UINT16(2);
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/*
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* * if entry is not leaf, use gbox_internal_consistent, * else use
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* gbox_leaf_consistent
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*/
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if (!(DatumGetPointer(entry->key) != NULL && query))
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PG_RETURN_BOOL(FALSE);
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if (GIST_LEAF(entry))
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PG_RETURN_BOOL(gbox_leaf_consistent((BOX *) DatumGetPointer(entry->key), query, strategy));
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else
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PG_RETURN_BOOL(rtree_internal_consistent((BOX *) DatumGetPointer(entry->key), query, strategy));
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}
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/*
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** The GiST Union method for boxes
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** returns the minimal bounding box that encloses all the entries in entryvec
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*/
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Datum
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gbox_union(PG_FUNCTION_ARGS)
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{
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bytea *entryvec = (bytea *) PG_GETARG_POINTER(0);
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int *sizep = (int *) PG_GETARG_POINTER(1);
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int numranges,
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i;
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BOX *cur,
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*pageunion;
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numranges = (VARSIZE(entryvec) - VARHDRSZ) / sizeof(GISTENTRY);
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pageunion = (BOX *) palloc(sizeof(BOX));
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cur = DatumGetBoxP(((GISTENTRY *) VARDATA(entryvec))[0].key);
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memcpy((void *) pageunion, (void *) cur, sizeof(BOX));
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for (i = 1; i < numranges; i++)
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{
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cur = DatumGetBoxP(((GISTENTRY *) VARDATA(entryvec))[i].key);
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if (pageunion->high.x < cur->high.x)
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pageunion->high.x = cur->high.x;
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if (pageunion->low.x > cur->low.x)
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pageunion->low.x = cur->low.x;
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if (pageunion->high.y < cur->high.y)
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pageunion->high.y = cur->high.y;
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if (pageunion->low.y > cur->low.y)
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pageunion->low.y = cur->low.y;
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}
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*sizep = sizeof(BOX);
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PG_RETURN_POINTER(pageunion);
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}
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/*
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** GiST Compress methods for boxes
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** do not do anything.
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*/
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Datum
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gbox_compress(PG_FUNCTION_ARGS)
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{
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PG_RETURN_POINTER(PG_GETARG_POINTER(0));
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}
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/*
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** The GiST Penalty method for boxes
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** As in the R-tree paper, we use change in area as our penalty metric
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*/
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Datum
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gbox_penalty(PG_FUNCTION_ARGS)
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{
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GISTENTRY *origentry = (GISTENTRY *) PG_GETARG_POINTER(0);
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GISTENTRY *newentry = (GISTENTRY *) PG_GETARG_POINTER(1);
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float *result = (float *) PG_GETARG_POINTER(2);
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Datum ud;
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float tmp1;
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ud = DirectFunctionCall2(rt_box_union, origentry->key, newentry->key);
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tmp1 = size_box(ud);
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if (DatumGetPointer(ud) != NULL)
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pfree(DatumGetPointer(ud));
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*result = tmp1 - size_box(origentry->key);
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PG_RETURN_POINTER(result);
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}
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typedef struct
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{
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BOX *key;
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int pos;
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} KBsort;
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static int
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compare_KB(const void *a, const void *b)
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{
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BOX *abox = ((KBsort *) a)->key;
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BOX *bbox = ((KBsort *) b)->key;
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float sa = (abox->high.x - abox->low.x) * (abox->high.y - abox->low.y);
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float sb = (bbox->high.x - bbox->low.x) * (bbox->high.y - bbox->low.y);
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if (sa == sb)
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return 0;
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return (sa > sb) ? 1 : -1;
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}
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/*
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** The GiST PickSplit method
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** New linear algorithm, see 'New Linear Node Splitting Algorithm for R-tree',
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** C.H.Ang and T.C.Tan
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*/
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Datum
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gbox_picksplit(PG_FUNCTION_ARGS)
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{
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bytea *entryvec = (bytea *) PG_GETARG_POINTER(0);
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GIST_SPLITVEC *v = (GIST_SPLITVEC *) PG_GETARG_POINTER(1);
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OffsetNumber i;
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OffsetNumber *listL,
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*listR,
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*listB,
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*listT;
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BOX *unionL,
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*unionR,
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*unionB,
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*unionT;
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int posL,
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posR,
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posB,
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posT;
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BOX pageunion;
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BOX *cur;
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char direction = ' ';
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bool allisequal = true;
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OffsetNumber maxoff;
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int nbytes;
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posL = posR = posB = posT = 0;
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maxoff = ((VARSIZE(entryvec) - VARHDRSZ) / sizeof(GISTENTRY)) - 1;
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cur = DatumGetBoxP(((GISTENTRY *) VARDATA(entryvec))[FirstOffsetNumber].key);
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memcpy((void *) &pageunion, (void *) cur, sizeof(BOX));
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/* find MBR */
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for (i = OffsetNumberNext(FirstOffsetNumber); i <= maxoff; i = OffsetNumberNext(i))
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{
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cur = DatumGetBoxP(((GISTENTRY *) VARDATA(entryvec))[i].key);
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if (allisequal == true && (
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pageunion.high.x != cur->high.x ||
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pageunion.high.y != cur->high.y ||
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pageunion.low.x != cur->low.x ||
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pageunion.low.y != cur->low.y
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))
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allisequal = false;
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if (pageunion.high.x < cur->high.x)
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pageunion.high.x = cur->high.x;
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if (pageunion.low.x > cur->low.x)
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pageunion.low.x = cur->low.x;
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if (pageunion.high.y < cur->high.y)
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pageunion.high.y = cur->high.y;
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if (pageunion.low.y > cur->low.y)
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pageunion.low.y = cur->low.y;
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}
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nbytes = (maxoff + 2) * sizeof(OffsetNumber);
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listL = (OffsetNumber *) palloc(nbytes);
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listR = (OffsetNumber *) palloc(nbytes);
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unionL = (BOX *) palloc(sizeof(BOX));
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unionR = (BOX *) palloc(sizeof(BOX));
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if (allisequal)
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{
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cur = DatumGetBoxP(((GISTENTRY *) VARDATA(entryvec))[OffsetNumberNext(FirstOffsetNumber)].key);
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if (memcmp((void *) cur, (void *) &pageunion, sizeof(BOX)) == 0)
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{
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v->spl_left = listL;
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v->spl_right = listR;
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v->spl_nleft = v->spl_nright = 0;
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memcpy((void *) unionL, (void *) &pageunion, sizeof(BOX));
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memcpy((void *) unionR, (void *) &pageunion, sizeof(BOX));
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for (i = FirstOffsetNumber; i <= maxoff; i = OffsetNumberNext(i))
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{
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if (i <= (maxoff - FirstOffsetNumber + 1) / 2)
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{
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v->spl_left[v->spl_nleft] = i;
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v->spl_nleft++;
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}
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else
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{
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v->spl_right[v->spl_nright] = i;
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v->spl_nright++;
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}
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}
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v->spl_ldatum = BoxPGetDatum(unionL);
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v->spl_rdatum = BoxPGetDatum(unionR);
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PG_RETURN_POINTER(v);
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}
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}
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listB = (OffsetNumber *) palloc(nbytes);
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listT = (OffsetNumber *) palloc(nbytes);
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unionB = (BOX *) palloc(sizeof(BOX));
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unionT = (BOX *) palloc(sizeof(BOX));
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#define ADDLIST( list, unionD, pos, num ) do { \
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if ( pos ) { \
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if ( unionD->high.x < cur->high.x ) unionD->high.x = cur->high.x; \
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if ( unionD->low.x > cur->low.x ) unionD->low.x = cur->low.x; \
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if ( unionD->high.y < cur->high.y ) unionD->high.y = cur->high.y; \
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if ( unionD->low.y > cur->low.y ) unionD->low.y = cur->low.y; \
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} else { \
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memcpy( (void*)unionD, (void*) cur, sizeof( BOX ) ); \
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} \
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list[pos] = num; \
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(pos)++; \
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} while(0)
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for (i = FirstOffsetNumber; i <= maxoff; i = OffsetNumberNext(i))
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{
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cur = DatumGetBoxP(((GISTENTRY *) VARDATA(entryvec))[i].key);
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if (cur->low.x - pageunion.low.x < pageunion.high.x - cur->high.x)
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ADDLIST(listL, unionL, posL, i);
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else
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ADDLIST(listR, unionR, posR, i);
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if (cur->low.y - pageunion.low.y < pageunion.high.y - cur->high.y)
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ADDLIST(listB, unionB, posB, i);
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else
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ADDLIST(listT, unionT, posT, i);
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}
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/* bad disposition, sort by ascending and resplit */
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if ((posR == 0 || posL == 0) && (posT == 0 || posB == 0))
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{
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KBsort *arr = (KBsort *) palloc(sizeof(KBsort) * maxoff);
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posL = posR = posB = posT = 0;
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for (i = FirstOffsetNumber; i <= maxoff; i = OffsetNumberNext(i))
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{
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arr[i - 1].key = DatumGetBoxP(((GISTENTRY *) VARDATA(entryvec))[i].key);
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arr[i - 1].pos = i;
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}
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qsort(arr, maxoff, sizeof(KBsort), compare_KB);
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for (i = FirstOffsetNumber; i <= maxoff; i = OffsetNumberNext(i))
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{
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cur = arr[i - 1].key;
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if (cur->low.x - pageunion.low.x < pageunion.high.x - cur->high.x)
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ADDLIST(listL, unionL, posL, arr[i - 1].pos);
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else if (cur->low.x - pageunion.low.x == pageunion.high.x - cur->high.x)
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{
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if (posL > posR)
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ADDLIST(listR, unionR, posR, arr[i - 1].pos);
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else
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ADDLIST(listL, unionL, posL, arr[i - 1].pos);
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}
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else
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ADDLIST(listR, unionR, posR, arr[i - 1].pos);
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if (cur->low.y - pageunion.low.y < pageunion.high.y - cur->high.y)
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ADDLIST(listB, unionB, posB, arr[i - 1].pos);
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else if (cur->low.y - pageunion.low.y == pageunion.high.y - cur->high.y)
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{
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if (posB > posT)
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ADDLIST(listT, unionT, posT, arr[i - 1].pos);
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else
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ADDLIST(listB, unionB, posB, arr[i - 1].pos);
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}
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else
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ADDLIST(listT, unionT, posT, arr[i - 1].pos);
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}
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pfree(arr);
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}
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/* which split more optimal? */
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if (Max(posL, posR) < Max(posB, posT))
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direction = 'x';
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else if (Max(posL, posR) > Max(posB, posT))
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direction = 'y';
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else
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{
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Datum interLR = DirectFunctionCall2(rt_box_inter,
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BoxPGetDatum(unionL),
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BoxPGetDatum(unionR));
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Datum interBT = DirectFunctionCall2(rt_box_inter,
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BoxPGetDatum(unionB),
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BoxPGetDatum(unionT));
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float sizeLR,
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sizeBT;
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sizeLR = size_box(interLR);
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sizeBT = size_box(interBT);
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if (sizeLR < sizeBT)
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direction = 'x';
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else
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direction = 'y';
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}
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if (direction == 'x')
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{
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pfree(unionB);
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pfree(listB);
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pfree(unionT);
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pfree(listT);
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v->spl_left = listL;
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v->spl_right = listR;
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v->spl_nleft = posL;
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v->spl_nright = posR;
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v->spl_ldatum = BoxPGetDatum(unionL);
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v->spl_rdatum = BoxPGetDatum(unionR);
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}
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else
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{
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pfree(unionR);
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pfree(listR);
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pfree(unionL);
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pfree(listL);
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v->spl_left = listB;
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v->spl_right = listT;
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v->spl_nleft = posB;
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v->spl_nright = posT;
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v->spl_ldatum = BoxPGetDatum(unionB);
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v->spl_rdatum = BoxPGetDatum(unionT);
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}
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PG_RETURN_POINTER(v);
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}
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/*
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** Equality method
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*/
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Datum
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gbox_same(PG_FUNCTION_ARGS)
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{
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BOX *b1 = (BOX *) PG_GETARG_POINTER(0);
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BOX *b2 = (BOX *) PG_GETARG_POINTER(1);
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bool *result = (bool *) PG_GETARG_POINTER(2);
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if (b1 && b2)
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*result = DatumGetBool(DirectFunctionCall2(box_same, PointerGetDatum(b1), PointerGetDatum(b2)));
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else
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*result = (b1 == NULL && b2 == NULL) ? TRUE : FALSE;
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PG_RETURN_POINTER(result);
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}
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/*
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** SUPPORT ROUTINES for boxes
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*/
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static bool
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gbox_leaf_consistent(BOX *key,
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BOX *query,
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StrategyNumber strategy)
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{
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bool retval;
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switch (strategy)
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{
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case RTLeftStrategyNumber:
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retval = DatumGetBool(DirectFunctionCall2(box_left, PointerGetDatum(key), PointerGetDatum(query)));
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break;
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case RTOverLeftStrategyNumber:
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retval = DatumGetBool(DirectFunctionCall2(box_overleft, PointerGetDatum(key), PointerGetDatum(query)));
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break;
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case RTOverlapStrategyNumber:
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retval = DatumGetBool(DirectFunctionCall2(box_overlap, PointerGetDatum(key), PointerGetDatum(query)));
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break;
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case RTOverRightStrategyNumber:
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retval = DatumGetBool(DirectFunctionCall2(box_overright, PointerGetDatum(key), PointerGetDatum(query)));
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break;
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case RTRightStrategyNumber:
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retval = DatumGetBool(DirectFunctionCall2(box_right, PointerGetDatum(key), PointerGetDatum(query)));
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break;
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case RTSameStrategyNumber:
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retval = DatumGetBool(DirectFunctionCall2(box_same, PointerGetDatum(key), PointerGetDatum(query)));
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break;
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case RTContainsStrategyNumber:
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retval = DatumGetBool(DirectFunctionCall2(box_contain, PointerGetDatum(key), PointerGetDatum(query)));
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break;
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case RTContainedByStrategyNumber:
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retval = DatumGetBool(DirectFunctionCall2(box_contained, PointerGetDatum(key), PointerGetDatum(query)));
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break;
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default:
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retval = FALSE;
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}
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return (retval);
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}
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static float
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size_box(Datum box)
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{
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if (DatumGetPointer(box) != NULL)
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{
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float size;
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DirectFunctionCall2(rt_box_size,
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box, PointerGetDatum(&size));
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return size;
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}
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else
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return 0.0;
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}
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/**************************************************
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* Polygon ops
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**************************************************/
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Datum
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gpoly_compress(PG_FUNCTION_ARGS)
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{
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GISTENTRY *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
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GISTENTRY *retval;
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if (entry->leafkey)
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{
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retval = palloc(sizeof(GISTENTRY));
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if (DatumGetPointer(entry->key) != NULL)
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{
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POLYGON *in;
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BOX *r;
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in = (POLYGON *) PG_DETOAST_DATUM(entry->key);
|
|
r = (BOX *) palloc(sizeof(BOX));
|
|
memcpy((void *) r, (void *) &(in->boundbox), sizeof(BOX));
|
|
if (in != (POLYGON *) DatumGetPointer(entry->key))
|
|
pfree(in);
|
|
|
|
gistentryinit(*retval, PointerGetDatum(r),
|
|
entry->rel, entry->page,
|
|
entry->offset, sizeof(BOX), FALSE);
|
|
|
|
}
|
|
else
|
|
{
|
|
gistentryinit(*retval, (Datum) 0,
|
|
entry->rel, entry->page,
|
|
entry->offset, 0, FALSE);
|
|
}
|
|
}
|
|
else
|
|
retval = entry;
|
|
PG_RETURN_POINTER(retval);
|
|
}
|
|
|
|
Datum
|
|
gpoly_consistent(PG_FUNCTION_ARGS)
|
|
{
|
|
GISTENTRY *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
|
|
POLYGON *query = (POLYGON *) PG_DETOAST_DATUM(PG_GETARG_POINTER(1));
|
|
StrategyNumber strategy = (StrategyNumber) PG_GETARG_UINT16(2);
|
|
bool result;
|
|
|
|
/*
|
|
* * if entry is not leaf, use gbox_internal_consistent, * else use
|
|
* gbox_leaf_consistent
|
|
*/
|
|
if (!(DatumGetPointer(entry->key) != NULL && query))
|
|
PG_RETURN_BOOL(FALSE);
|
|
|
|
result = rtree_internal_consistent((BOX *) DatumGetPointer(entry->key),
|
|
&(query->boundbox), strategy);
|
|
|
|
PG_FREE_IF_COPY(query, 1);
|
|
PG_RETURN_BOOL(result);
|
|
}
|
|
|
|
/*****************************************
|
|
* Common rtree-function (for all ops)
|
|
*****************************************/
|
|
|
|
static bool
|
|
rtree_internal_consistent(BOX *key,
|
|
BOX *query,
|
|
StrategyNumber strategy)
|
|
{
|
|
bool retval;
|
|
|
|
switch (strategy)
|
|
{
|
|
case RTLeftStrategyNumber:
|
|
case RTOverLeftStrategyNumber:
|
|
retval = DatumGetBool(DirectFunctionCall2(box_overleft, PointerGetDatum(key), PointerGetDatum(query)));
|
|
break;
|
|
case RTOverlapStrategyNumber:
|
|
retval = DatumGetBool(DirectFunctionCall2(box_overlap, PointerGetDatum(key), PointerGetDatum(query)));
|
|
break;
|
|
case RTOverRightStrategyNumber:
|
|
case RTRightStrategyNumber:
|
|
retval = DatumGetBool(DirectFunctionCall2(box_right, PointerGetDatum(key), PointerGetDatum(query)));
|
|
break;
|
|
case RTSameStrategyNumber:
|
|
case RTContainsStrategyNumber:
|
|
retval = DatumGetBool(DirectFunctionCall2(box_contain, PointerGetDatum(key), PointerGetDatum(query)));
|
|
break;
|
|
case RTContainedByStrategyNumber:
|
|
retval = DatumGetBool(DirectFunctionCall2(box_overlap, PointerGetDatum(key), PointerGetDatum(query)));
|
|
break;
|
|
default:
|
|
retval = FALSE;
|
|
}
|
|
return (retval);
|
|
}
|
|
|
|
/*
|
|
** GiST DeCompress methods
|
|
** do not do anything.
|
|
*/
|
|
Datum
|
|
rtree_decompress(PG_FUNCTION_ARGS)
|
|
{
|
|
PG_RETURN_POINTER(PG_GETARG_POINTER(0));
|
|
}
|