MonetDB: Feb2013 - reduce cost of dead code elimination

[Niels Nes]

Changeset: 1191adce6993 for MonetDB
URL: http://dev.monetdb.org/hg/MonetDB?cmd=changeset;node=1191adce6993
Modified Files:
        sql/server/rel_optimizer.c
Branch: Feb2013
Log Message:

reduce cost of dead code elimination


diffs (13 lines):

diff --git a/sql/server/rel_optimizer.c b/sql/server/rel_optimizer.c
--- a/sql/server/rel_optimizer.c
+++ b/sql/server/rel_optimizer.c
@@ -6276,7 +6276,8 @@ static sql_rel *
                rel = rewrite(sql, rel, &rel_push_project_down_union, &changes);
 
        /* Remove unused expressions */
-       rel = rel_dce(sql, rel);
+       if (level <= 0)
+               rel = rel_dce(sql, rel);
 
        if (gp.cnt[op_join] || 
            gp.cnt[op_left] || gp.cnt[op_right] || gp.cnt[op_full] || 
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