Changeset: dafc6b6340fd for MonetDB
URL: http://dev.monetdb.org/hg/MonetDB?cmd=changeset;node=dafc6b6340fd
Modified Files:
pathfinder/compiler/algebra/opt/opt_reqval.c
Branch: default
Log Message:
Extended rowrank rewrite
A rowrank is now pruned if it has exactly one order criterion
and is only used in a mapping join or an aggregate.
diffs (17 lines):
diff -r 4d0af73df097 -r dafc6b6340fd
pathfinder/compiler/algebra/opt/opt_reqval.c
--- a/pathfinder/compiler/algebra/opt/opt_reqval.c Sun Jul 11 13:34:54
2010 +0200
+++ b/pathfinder/compiler/algebra/opt/opt_reqval.c Tue Jul 13 17:05:09
2010 +0200
@@ -123,10 +123,11 @@
PFprop_req_rank_col (p->prop, p->sem.sort.res))
*p = *rank (L(p), p->sem.sort.res, p->sem.sort.sortby);
else if (p->kind == la_rowrank &&
- PFprop_req_multi_col_col (p->prop, p->sem.sort.res) &&
+ (PFprop_req_bijective_col (p->prop, p->sem.sort.res) ||
+ (PFprop_req_multi_col_col (p->prop, p->sem.sort.res) &&
/* single ascending order criterion */
+ PFord_order_dir_at (p->sem.sort.sortby, 0) == DIR_ASC)) &&
PFord_count (p->sem.sort.sortby) == 1 &&
- PFord_order_dir_at (p->sem.sort.sortby, 0) == DIR_ASC &&
/* sort criterion should not stem from a rank operator */
PFprop_type_of (p, PFord_order_col_at (p->sem.sort.sortby, 0))
!= aat_nat) {
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