Hoi Niels (and other SQL experts),

I implemented the "bulk" version of ogc constructor function point(x:dbl,y:dbl) :wkb i.e. point(x:bat[:oid,:dbl],y:bat[:oid,:dbl]) :bat[:oid,:wkb] in the geom module (see below).

How do I get SQL to use this function, e.g., in a scenario like this: CREATE TABLE coords (x double, y double); CREATE TABLE points (p point); INSERT INTO points SELECT POINT(x,y) FROM coords;

For now, EXPLAIN still shows the explicit MAL interation calling the original scalar function:

[...] | _67 := bat.new(nil:oid,nil:wkb); | | barrier (_71,_72,_73) := bat.newIterator(_16); | | _75 := algebra.find(_24,_72); | | _77 := geom.point(_73,_75); | | bat.insert(_67,_72,_77); | | redo (_71,_72,_73) := bat.hasMoreElements(_16); | | exit (_71,_72,_73); | | _25:bat[:oid,:wkb] := _67; | [...]

Thanks in advance!

Stefan

ps: Eventually, we should consider implemeting bulk versions of all scalar functions in geom in the same (or a similar) way --- assuming that this might improve the performance ...

On Thu, Oct 22, 2009 at 04:15:30PM +0000, Stefan Manegold wrote:

Update of /cvsroot/monetdb/geom/src/monetdb5 In directory 23jxhf1.ch3.sourceforge.com:/tmp/cvs-serv25812/geom/src/monetdb5

Modified Files: geom.mx Log Message:

implemented bulk version of ogc constructor function point(x:dbl,y:dbl) :wkb i.e. point(x:bat[:oid,:dbl],y:bat[:oid,:dbl]) :bat[:oid,:wkb]

Open question: How to make SQL use this bulk function instead of an explicit MAL iterator over the scalar function, e.g., in queries like INSERT INTO points SELECT POINT(x, y) FROM coords;

Index: geom.mx

RCS file: /cvsroot/monetdb/geom/src/monetdb5/geom.mx,v retrieving revision 1.29 retrieving revision 1.30 diff -u -d -r1.29 -r1.30 --- geom.mx 26 Jun 2009 07:37:52 -0000 1.29 +++ geom.mx 22 Oct 2009 16:15:28 -0000 1.30 @@ -170,6 +170,10 @@ address wkbcreatepoint comment "Construct a point from two geometries";

+command point(x:bat[:oid,:dbl],y:bat[:oid,:dbl]) :bat[:oid,:wkb] +address wkbcreatepoint_bat +comment "Construct a point-BAT from two geometry-BATs";

@+ ogc information methods @mal command X(g:wkb) :dbl @@ -1010,6 +1014,76 @@ }

geom_export str +wkbcreatepoint_bat(int *out, int *x,int *y);

+str +wkbcreatepoint_bat(int *out, int *ix,int *iy) +{

• BAT *bo = NULL, *bx = NULL, *by = NULL;
• dbl *x = NULL, *y = NULL;
• BUN i, o;
• wkb *p = NULL;
• if ((bx = BATdescriptor(*ix)) == NULL) {

• throw(MAL, "geom.point", RUNTIME_OBJECT_MISSING);
  

• }
• if ((by = BATdescriptor(*iy)) == NULL) {

• BBPreleaseref(bx->batCacheid);
  

• throw(MAL, "geom.point", RUNTIME_OBJECT_MISSING);
  

• }
• if (!BAThdense(bx) || !BAThdense(by) || bx->hseqbase != by->hseqbase || BATcount(bx) != BATcount(by)) {

• BBPreleaseref(bx->batCacheid);
  

• BBPreleaseref(by->batCacheid);
  

• throw(MAL, "geom.point", "both arguments must have dense and aligned heads");
  

• }
• if ((bo = BATnew(TYPE_void, ATOMindex("wkb"), BATcount(bx))) == NULL) {

• BBPreleaseref(bx->batCacheid);
  

• BBPreleaseref(by->batCacheid);
  

• throw(MAL, "geom.point", MAL_MALLOC_FAIL);
  

• }
• BATseqbase(bo, bx->hseqbase);
• bo->hdense = TRUE;
• bo->hsorted = TRUE;
• bo->H->nonil = TRUE;
• BATkey(bo, TRUE);
• x = (dbl*) Tloc(bx, BUNfirst(bx));
• y = (dbl*) Tloc(by, BUNfirst(bx));
• for (i = 0, o = BUNlast(bo); i < BATcount(bx); i++, o++) {

• str err = NULL;
  

• if ((err = wkbcreatepoint(&p, &x[i], &y[i])) != MAL_SUCCEED) {
  

• 	BBPreleaseref(bx->batCacheid);
  

• 	BBPreleaseref(by->batCacheid);
  

• 	BBPreleaseref(bo->batCacheid);
  

• 	throw(MAL, "geom.point", err);
  

• }
  

• tfastins_nocheck(bo, o, p, Tsize(bo));
  

• GDKfree(p);
  

• p = NULL;
  

• }
• BATsetcount(bo, BATcount(bx));
• bo->batDirty = TRUE;
• bo->tdense = FALSE;
• bo->tsorted = FALSE;
• bo->T->nonil = FALSE;
• BATkey(BATmirror(bo), FALSE);
• BBPreleaseref(bx->batCacheid);
• BBPreleaseref(by->batCacheid);
• BBPkeepref(*out = bo->batCacheid);
• return MAL_SUCCEED;
• bunins_failed:
• if (p) GDKfree(p);
• BBPreleaseref(bx->batCacheid);
• BBPreleaseref(by->batCacheid);
• BBPreleaseref(bo->batCacheid);
• throw(MAL, "geom.point", "bunins failed");

+}

+geom_export str mbroverlaps( bit *out, mbr *b1, mbr *b2);

str

---

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