Changeset: 5070ec27cf06 for MonetDB
URL: https://dev.monetdb.org/hg/MonetDB/rev/5070ec27cf06
Modified Files:
sql/server/rel_optimize_proj.c
Branch: label
Log Message:
add v1 of merge_unions
diffs (43 lines):
diff --git a/sql/server/rel_optimize_proj.c b/sql/server/rel_optimize_proj.c
--- a/sql/server/rel_optimize_proj.c
+++ b/sql/server/rel_optimize_proj.c
@@ -3461,6 +3461,31 @@ rel_push_project_down_union(visitor *v,
return rel;
}
+static inline sql_rel *
+rel_merge_unions(visitor *v, sql_rel *rel)
+{
+ (void)v;
+ if (rel && is_munion(rel->op)) {
+ list *l = rel->l;
+ for(node *n = l->h; n; ) {
+ node *next = n->next;
+ sql_rel *i = n->data;
+ if (is_munion(i->op)) {
+ i = rel_dup(i);
+ list_remove_node(l, NULL, n);
+ l = list_merge(l, i->l, (fdup)NULL);
+ i->l = NULL;
+ rel_destroy(i);
+ if (!next)
+ next = l->h;
+ }
+ n = next;
+ }
+ rel->l = l;
+ }
+ return rel;
+}
+
/*
* Push (semi)joins down unions, this is basically for merge tables, where
* we know that the fk-indices are split over two clustered merge tables.
@@ -3879,6 +3904,7 @@ static sql_rel *
rel_optimize_unions_topdown_(visitor *v, sql_rel *rel)
{
rel = rel_push_project_down_union(v, rel);
+ rel = rel_merge_unions(v, rel);
rel = rel_push_join_down_munion(v, rel);
return rel;
}
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