# name: test/sql/update/null_update_merge.test
# description: Test repeated updates that change the nullness of values
# group: [update]

# create a table
statement ok
CREATE TABLE test (id INTEGER, a INTEGER);

statement ok
INSERT INTO test VALUES (1, 1), (2, 2), (3, 3), (4, NULL);

query II
SELECT * FROM test ORDER BY id;
----
1	1
2	2
3	3
4	NULL

statement ok
UPDATE test SET a=CASE WHEN id=1 THEN 7 ELSE NULL END WHERE id <= 2

query II
SELECT * FROM test ORDER BY id;
----
1	7
2	NULL
3	3
4	NULL

statement ok
UPDATE test SET a=17 WHERE id > 2

query II
SELECT * FROM test ORDER BY id;
----
1	7
2	NULL
3	17
4	17

statement ok
UPDATE test SET a=CASE WHEN id=4 THEN 1 ELSE NULL END

query II
SELECT * FROM test ORDER BY id;
----
1	NULL
2	NULL
3	NULL
4	1

statement ok
UPDATE test SET a=2 WHERE id >= 2 AND id <= 3

query II
SELECT * FROM test ORDER BY id;
----
1	NULL
2	2
3	2
4	1

statement ok
UPDATE test SET a=NULL WHERE id >= 3

query II
SELECT * FROM test ORDER BY id;
----
1	NULL
2	2
3	NULL
4	NULL

statement ok
UPDATE test SET a=id WHERE id != 3

query II
SELECT * FROM test ORDER BY id;
----
1	1
2	2
3	NULL
4	4

statement ok
UPDATE test SET a=NULL WHERE id != 3

query II
SELECT * FROM test ORDER BY id;
----
1	NULL
2	NULL
3	NULL
4	NULL

statement ok
UPDATE test SET a=3 WHERE id != 2

query II
SELECT * FROM test ORDER BY id;
----
1	3
2	NULL
3	3
4	3

statement ok
UPDATE test SET a=7 WHERE id != 3

query II
SELECT * FROM test ORDER BY id;
----
1	7
2	7
3	3
4	7

statement ok
UPDATE test SET a=NULL

query II
SELECT * FROM test ORDER BY id;
----
1	NULL
2	NULL
3	NULL
4	NULL