Update of /cvsroot/monetdb/pathfinder/compiler/algebra/opt
In directory sc8-pr-cvs16.sourceforge.net:/tmp/cvs-serv7122/algebra/opt
Modified Files:
Tag: XQuery_0-24
opt_complex.c opt_set.c
Log Message:
-- Disable the blocking step and semijoin operators
and replace them by step_join+distinct and eqjoin+distinct.
This change gives the optimizer more freedom and removes the last
traces of staircase-join from the logical plans.
The physical algebra planner will try to implement step_join whenever
possible with a duplicate-eliminating staircase-join operator.
U opt_complex.c
Index: opt_complex.c
===================================================================
RCS file: /cvsroot/monetdb/pathfinder/compiler/algebra/opt/opt_complex.c,v
retrieving revision 1.45.2.1
retrieving revision 1.45.2.2
diff -u -d -r1.45.2.1 -r1.45.2.2
--- opt_complex.c 30 May 2008 16:14:46 -0000 1.45.2.1
+++ opt_complex.c 3 Jun 2008 11:53:40 -0000 1.45.2.2
@@ -635,6 +635,7 @@
break;
}
+#if 0 /* disable join -> semijoin rewrites */
/* introduce semi-join operator if possible */
if (!left_arg_req &&
(PFprop_key_left (p->prop, p->sem.eqjoin.att1) ||
@@ -750,6 +751,7 @@
*p = *PFla_project_ (semijoin, count, proj);
break;
}
+#endif
} break;
case la_semijoin:
U opt_set.c
Index: opt_set.c
===================================================================
RCS file: /cvsroot/monetdb/pathfinder/compiler/algebra/opt/opt_set.c,v
retrieving revision 1.10
retrieving revision 1.10.2.1
diff -u -d -r1.10 -r1.10.2.1
--- opt_set.c 16 Feb 2008 19:42:40 -0000 1.10
+++ opt_set.c 3 Jun 2008 11:53:41 -0000 1.10.2.1
@@ -142,6 +142,7 @@
p->sem.step.item);
break;
+#if 0 /* disable step_join -> step rewrite */
case la_step_join:
if (PFprop_set (p->prop) &&
PFprop_icols_count (p->prop) == 2 &&
@@ -174,6 +175,7 @@
p->sem.step.item_res);
}
break;
+#endif
case la_guide_step:
if (PFprop_set (p->prop) &&
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