On Fri, Mar 20, 2009 at 09:58:04AM +0000, Bastian Brodbeck wrote:
Update of /cvsroot/monetdb/pathfinder/compiler/algebra In directory 23jxhf1.ch3.sourceforge.com:/tmp/cvs-serv13909/compiler/algebra
Modified Files: Tag: Feb2009
^^^^^^^
algopt.c Log Message: adding new optimization -Y
^^^^^^^^^^^^^^^^^^^^^^^^^^ is this a bug fix or a new feature?
If the latter (as I suspect), please undo this checking on the Feb2009 branch and redo it on the development trunk (HEAD), using only CVS commands, as, e.g., discribed on page 15 of http://homepages.cwi.nl/~manegold/Presentations/MonetDBdevTTT.pdf (pages 8 - 16 might be interesting)
Thanks!
Stefan
this optimization pushes projection up in the tree to minimize them. the goal is to simplify the tree for other optimizations
U algopt.c Index: algopt.c =================================================================== RCS file: /cvsroot/monetdb/pathfinder/compiler/algebra/algopt.c,v retrieving revision 1.46.2.4 retrieving revision 1.46.2.5 diff -u -d -r1.46.2.4 -r1.46.2.5 --- algopt.c 6 Feb 2009 14:48:45 -0000 1.46.2.4 +++ algopt.c 20 Mar 2009 09:58:02 -0000 1.46.2.5 @@ -179,6 +179,19 @@ PFlog (" MonetDB specific optimizations: %s", PFtimer_str (tm)); break;
case 'Y':/*REMOVE_PROXIES("MonetDB specific optimization")*/tm = PFtimer_start ();root = PFalgopt_projection (root);tm = PFtimer_stop (tm);if (timing)PFlog (" project optimizations: %s",PFtimer_str (tm));break; case 'E': MAP_UNQ_NAMES("common subexpression elimination")
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