Stratos (and others ;-)),
please find below some comments, hints and questions.
Stefan
On Wed, Sep 16, 2009 at 09:53:56PM +0000, stratos wrote:
Update of /cvsroot/monetdb/MonetDB5/src/modules/mal/crackers In directory 23jxhf1.ch3.sourceforge.com:/tmp/cvs-serv11656/src/modules/mal/crackers
Modified Files: crackers.mx crackers_sideways.mx Log Message: position-based tuple reconstruction to use in sideways plans with crack joins
U crackers.mx Index: crackers.mx =================================================================== RCS file: /cvsroot/monetdb/MonetDB5/src/modules/mal/crackers/crackers.mx,v retrieving revision 1.16 retrieving revision 1.17 diff -u -d -r1.16 -r1.17 --- crackers.mx 30 Apr 2009 18:43:40 -0000 1.16 +++ crackers.mx 16 Sep 2009 21:53:53 -0000 1.17 @@ -504,6 +504,10 @@ address CRKdProject_@1_@2 comment "Sync the cracking pair and project the tail. Use for disjunctive queries that require a larger bit vector";
+command positionproject( b:bat[:oid,:@1],bp:bat[:oid,:@2],pivot:bat[:oid,:oid]):bat[:oid,:@2] +address CRKdPositionProject_@1_@2 +comment "Sync the cracking pair and project the tail. Use position based pivot";
command projectH( b:bat[:oid,:@1],bp:bat[:oid,:@2],l:@1,h:@1,li:bit,hi:bit):bat[:oid,:@1] address CRKProjectH_@1_@2 comment "Sync the cracking pair and project the head";
U crackers_sideways.mx Index: crackers_sideways.mx =================================================================== RCS file: /cvsroot/monetdb/MonetDB5/src/modules/mal/crackers/crackers_sideways.mx,v retrieving revision 1.21 retrieving revision 1.22 diff -u -d -r1.21 -r1.22 --- crackers_sideways.mx 30 Apr 2009 18:43:40 -0000 1.21 +++ crackers_sideways.mx 16 Sep 2009 21:53:53 -0000 1.22 @@ -153,6 +153,7 @@ crackers_export str CRKMarkedProject_@1_@2(int *res, int *bid, int *pbid, int *pivot, @1 *low, @1 *hgh, bit *inclusiveLow, bit *inclusiveHgh); crackers_export str CRKPositionProject_@1_@2(int *res, int *bid, int *pbid, int *PositionPivot, @1 *low, @1 *hgh, bit *inclusiveLow, bit *inclusiveHgh); crackers_export str CRKdProject_@1_@2(int *res, int *bid, int *pbid, int *pivot); +crackers_export str CRKdPositionProject_@1_@2(int *res, int *bid, int *pbid, int *pivot); @
@{ @@ -1025,6 +1026,63 @@
return MAL_SUCCEED;}
+str +CRKdPositionProject_@1_@2(int *res, int *bid, int *pbid,int *pivot){
BAT *b, *p, *r, *c;@2 *pairt, *rest;- oid *pivott;
oid size;- int m;
- oid j;
- /* If the necessary map does not exits, then create it */
- m = existsCrackerIndexSideways(*bid, *pbid);
- if (m==-1){
@:CreateCrackerMap(@1,@2)@BBPkeepref(b->batCacheid);BBPkeepref(c->batCacheid);- }
- /* Align the map based on the cracker tape of this set */
- Sync_@1_@2(m,existsCrackerIndexSideways(*bid, -1));
- /* Get the map */
if ((b = BATdescriptor(CrackerIndex[m].cbid)) == NULL)throw(MAL, "crackers.CRKProject", "Cannot access descriptor");if ((p = BATdescriptor(*pivot)) == NULL)throw(MAL, "crackers.CRKProject", "Cannot access descriptor");size = BATcount(p);- r = BATnew(TYPE_void,b->ttype,size);
This might fail. Error handling?
pairt = (@2 *)Tloc(b, BUNfirst(b));pivott = (oid*)Tloc(p, BUNfirst(p));rest = (@2 *)Tloc(r, BUNfirst(r));- for (j = 0; j<size; j++){
*rest = *(pairt + *pivott);rest ++;pivott ++;
What about replacing the above three lines by
rest[j] = pairt[pivott[j]];
?
- }
- BATmark(BATmirror(p),0);
^^^^^^^^^^^^^^^^^^!^^^^^
What's is the purpose/intention of this statement? It IMHO represents a side-effect, since it marks one of the input operands ...
Stefan
BATsetcount(r, size);- r->hsorted = FALSE;
r->tsorted = FALSE;r->hdense = FALSE;r->tdense = FALSE;*res = r->batCacheid;BBPkeepref(r->batCacheid);BBPunfix(p->batCacheid);BBPunfix(b->batCacheid);return MAL_SUCCEED;+} @
@- Local support functions and macros
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