**Describe the bug**
The `IS DISTINCT FROM` operator in MonetDB returns unexpected results when used with `RIGHT JOIN`. Specifically, the `IS DISTINCT FROM` condition should correctly evaluate to true for NULL values in t1.c1, thus not filtering out the rows from the result set. However, the actual result is an empty table, indicating a potential issue with the IS DISTINCT FROM evaluation in the presence of NULL values during a RIGHT JOIN.

**To Reproduce**

```sql
DROP TABLE IF EXISTS t0 CASCADE;
DROP TABLE IF EXISTS t1 CASCADE;

CREATE TABLE t0(c0 INT);
CREATE TABLE t1(c1 INT);
INSERT INTO t0 (c0) VALUES (0);

SELECT * FROM t1 RIGHT  JOIN t0 ON true; -- null 0
SELECT (1 IS DISTINCT FROM t1.c1) FROM t1 RIGHT  JOIN t0 ON true ; -- true
SELECT * FROM t1 RIGHT  JOIN t0 ON true WHERE (1 IS DISTINCT FROM t1.c1);
-- Expected: null 0
-- Actual: empty table

```

**Expected behavior**
As mentioned above.

**Screenshots**
N/A

**Software versions**
Build from source:

```
> docker exec -it monetdb-test mserver5 --version         
MonetDB 5 server 11.50.0 (hg id: 389e974) (64-bit, 128-bit integers)
This is an unreleased version
Copyright (c) 1993 - July 2008 CWI
Copyright (c) August 2008 - 2023 MonetDB B.V., all rights reserved
Visit https://www.monetdb.org/ for further information
Found 503.5GiB available memory, 128 available cpu cores
Libraries:
Compiled by: @efa472fb0bee (x86_64-pc-linux-gnu)
Compilation: /usr/bin/cc 
Linking    : /usr/bin/ld
```

**Issue labeling**
Bug

**Additional context**
Add any other context about the problem here.
Unexpected result when using `IS DISTINCT FROM` with `RIGHT JOIN`
This is a GitHub Issue
repo:MonetDB
owner:MonetDB
Title : Unexpected result when using `IS DISTINCT FROM` with `RIGHT JOIN`
Issue date:

--- start body ---
**Describe the bug**
The `IS DISTINCT FROM` operator in MonetDB returns unexpected results when used with `RIGHT JOIN`. Specifically, the `IS DISTINCT FROM` condition should correctly evaluate to true for NULL values in t1.c1, thus not filtering out the rows from the result set. However, the actual result is an empty table, indicating a potential issue with the IS DISTINCT FROM evaluation in the presence of NULL values during a RIGHT JOIN.

**To Reproduce**

```sql
DROP TABLE IF EXISTS t0 CASCADE;
DROP TABLE IF EXISTS t1 CASCADE;

CREATE TABLE t0(c0 INT);
CREATE TABLE t1(c1 INT);
INSERT INTO t0 (c0) VALUES (0);

SELECT * FROM t1 RIGHT  JOIN t0 ON true; -- null 0
SELECT (1 IS DISTINCT FROM t1.c1) FROM t1 RIGHT  JOIN t0 ON true ; -- true
SELECT * FROM t1 RIGHT  JOIN t0 ON true WHERE (1 IS DISTINCT FROM t1.c1);
-- Expected: null 0
-- Actual: empty table

```

**Expected behavior**
As mentioned above.

**Screenshots**
N/A

**Software versions**
Build from source:

```
> docker exec -it monetdb-test mserver5 --version         
MonetDB 5 server 11.50.0 (hg id: 389e974) (64-bit, 128-bit integers)
This is an unreleased version
Copyright (c) 1993 - July 2008 CWI
Copyright (c) August 2008 - 2023 MonetDB B.V., all rights reserved
Visit https://www.monetdb.org/ for further information
Found 503.5GiB available memory, 128 available cpu cores
Libraries:
Compiled by: @efa472fb0bee (x86_64-pc-linux-gnu)
Compilation: /usr/bin/cc 
Linking    : /usr/bin/ld
```

**Issue labeling**
Bug

**Additional context**
Add any other context about the problem here.
--- end body ---
