MonetDB: default - Do less expression copying

[Pedro Ferreira]

Changeset: deb4c99a78af for MonetDB
URL: https://dev.monetdb.org/hg/MonetDB/rev/deb4c99a78af
Modified Files:
        sql/server/rel_optimizer.c
Branch: default
Log Message:

Do less expression copying


diffs (16 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
@@ -4909,8 +4909,10 @@ rel_push_semijoin_down_or_up(visitor *v,
                        return rel;
                if (right && is_left(lop))
                        return rel;
-               nsexps = exps_copy(v->sql, rel->exps);
-               njexps = exps_copy(v->sql, l->exps);
+               nsexps = rel->exps;
+               rel->exps = NULL; /* prepare to delete relation */
+               njexps = l->exps;
+               l->exps = NULL;
                if (left)
                        l = rel_crossproduct(v->sql->sa, rel_dup(ll), 
rel_dup(r), op);
                else
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