Update of /cvsroot/monetdb/pathfinder/compiler/include
In directory 23jxhf1.ch3.sourceforge.com:/tmp/cvs-serv5320/compiler/include
Modified Files:
Tag: M5XQ
physical_mnemonic.h
Log Message:
propagated changes of Wednesday May 20 2009
from the development trunk to the M5XQ branch
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
2009/05/20 - tsheyar: compiler/include/physical_mnemonic.h,1.40
-- Renamed algebra/intro_rec_border.c into algebra/intro_borders.c.
-- Renamed include/intro_rec_border.h into include/intro_borders.h.
-- Extended the physical algebra with a dependent cross product operator
that only evaluates its right side if the left side produces at least
one row.
This change implicitely implements a control structure for some conditionals.
E.g., the following query conditionally evaluates the independent
expressions ('doc("xmark-sf0.001.xml")//*' and 'doc("xmark-sf100.xml")//*'):
if (1 = (1,2,3))
then doc("xmark-sf0.1.xml")//*
else doc("xmark-sf100.xml")//*
With the dependent cross product operator in place this leads to the
evaluation
of the (previously independent) then-branch and the avoidance of the
evaluation
of the (expensive) else-branch.
-- Adjusted stable output.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
U physical_mnemonic.h
Index: physical_mnemonic.h
===================================================================
RCS file: /cvsroot/monetdb/pathfinder/compiler/include/physical_mnemonic.h,v
retrieving revision 1.39
retrieving revision 1.39.2.1
diff -u -d -r1.39 -r1.39.2.1
--- physical_mnemonic.h 6 Feb 2009 13:01:53 -0000 1.39
+++ physical_mnemonic.h 20 May 2009 16:29:03 -0000 1.39.2.1
@@ -49,6 +49,11 @@
/** cartesian product */
#define cross(a,b) PFpa_cross ((a),(b))
+/** dependent cross product */
+#define dep_cross(a,b) PFpa_dep_cross ((a),(b))
+/** dependent border indicator */
+#define dep_border(a) PFpa_dep_border ((a))
+
/** join that preserves the order of the first argument */
#define leftjoin(a,b,c,d) PFpa_leftjoin ((a), (b), (c), (d))
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