should be it

external/duckdb/test/sql/upsert/upsert_default.test

@@ -0,0 +1,47 @@
+# name: test/sql/upsert/upsert_default.test
+# group: [upsert]
+
+statement ok
+pragma enable_verification;
+
+statement ok
+create table tbl (
+	a integer DEFAULT 5,
+	b integer unique,
+	c integer DEFAULT 10
+);
+
+statement ok
+insert into tbl(b) VALUES (3), (5), (6);
+
+statement ok
+insert into tbl(b) VALUES (7), (3), (4) ON CONFLICT do update set c = 5, a = 10;
+
+query III rowsort
+select * from tbl;
+----
+10	3	5
+5	4	10
+5	5	10
+5	6	10
+5	7	10
+
+statement ok
+create table t (i int primary key, j int);
+
+query I
+insert into t values (1, 1) on conflict do nothing;
+----
+1
+
+# 0 updates/insertions were performed
+query I
+insert into t values (1, 1) on conflict do nothing
+----
+0
+
+# 0 insertions, but one tuple is updated
+query I
+insert into t values (1, 1) on conflict (i) do update set j = excluded.i;
+----
+1