# name: test/sql/update/test_null_update.test
# description: Test standard update behavior with NULLs
# group: [update]

statement ok
SET default_null_order='nulls_first';

# create a table
statement ok con1
CREATE TABLE test (a INTEGER);

statement ok con1
INSERT INTO test VALUES (1), (2), (3), (NULL)

query I con1
SELECT * FROM test ORDER BY a
----
NULL
1
2
3

# test updating from a non-null value to a null value
statement ok con1
BEGIN TRANSACTION

statement ok con1
UPDATE test SET a=NULL WHERE a=2

# not seen yet by con2, only by con1
query I con1
SELECT * FROM test ORDER BY a
----
NULL
NULL
1
3

query I con2
SELECT * FROM test ORDER BY a
----
NULL
1
2
3

# commit
statement ok con1
COMMIT

query I con1
SELECT * FROM test ORDER BY a
----
NULL
NULL
1
3

query I con2
SELECT * FROM test ORDER BY a
----
NULL
NULL
1
3

# now test a rollback
statement ok con1
BEGIN TRANSACTION

statement ok con1
UPDATE test SET a=NULL WHERE a=3

# not seen yet by con2, only by con1
query I con1
SELECT * FROM test ORDER BY a
----
NULL
NULL
NULL
1

query I con2
SELECT * FROM test ORDER BY a
----
NULL
NULL
1
3

statement ok con1
ROLLBACK

query I con1
SELECT * FROM test ORDER BY a
----
NULL
NULL
1
3

query I con2
SELECT * FROM test ORDER BY a
----
NULL
NULL
1
3

# test updating from a null value to a non-null value
statement ok con1
BEGIN TRANSACTION

statement ok con1
UPDATE test SET a=10 WHERE a IS NULL

# not seen yet by con2, only by con1
query I con1
SELECT * FROM test ORDER BY a
----
1
3
10
10

query I con2
SELECT * FROM test ORDER BY a
----
NULL
NULL
1
3

# now rollback
statement ok con1
ROLLBACK

# values are back to original values
query I con1
SELECT * FROM test ORDER BY a
----
NULL
NULL
1
3

query I con2
SELECT * FROM test ORDER BY a
----
NULL
NULL
1
3

# perform the same update, but this time commit
statement ok con1
BEGIN TRANSACTION

statement ok con1
UPDATE test SET a=10 WHERE a IS NULL

query I con1
SELECT * FROM test ORDER BY a
----
1
3
10
10

query I con2
SELECT * FROM test ORDER BY a
----
NULL
NULL
1
3

statement ok con1
COMMIT

query I con1
SELECT * FROM test ORDER BY a
----
1
3
10
10

query I con2
SELECT * FROM test ORDER BY a
----
1
3
10
10