Update of /cvsroot/monetdb/pathfinder/compiler
In directory 23jxhf1.ch3.sourceforge.com:/tmp/cvs-serv4866/compiler
Modified Files:
Tag: M5XQ
main.c
Log Message:
propagated changes of Wednesday May 20 2009
from the development trunk to the M5XQ branch
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
2009/05/20 - tsheyar: compiler/main.c,1.116
-- 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 main.c
Index: main.c
===================================================================
RCS file: /cvsroot/monetdb/pathfinder/compiler/main.c,v
retrieving revision 1.114.2.1
retrieving revision 1.114.2.2
diff -u -d -r1.114.2.1 -r1.114.2.2
--- main.c 7 May 2009 14:40:47 -0000 1.114.2.1
+++ main.c 20 May 2009 16:27:47 -0000 1.114.2.2
@@ -588,7 +588,7 @@
[17] = "after the logical algebra tree has been rewritten/optimized",
[18] = "after the CSE on the logical algebra tree",
[19] = "after compiling logical algebra into the physical algebra (or
SQL)",
- [20] = "after introducing recursion boundaries",
+ [20] = "after introducing boundary operators",
[21] = "after compiling the physical algebra into MIL code",
[22] = "after the MIL program has been serialized"
};
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