raghavyadav01 commented on issue #25480:
URL: https://github.com/apache/datafusion/issues/25480#issuecomment-6506155514

   Checked on current main (14aa185dd), this returns the right rows now:
   
   ```sql
   CREATE TABLE t1(id INT, z INT) AS VALUES (1,10), (2,20), (NULL,30), (4,40);
   CREATE TABLE t2(id INT, z INT) AS VALUES (1,5), (NULL,50), (5,10);
   SELECT id FROM t1 WHERE id NOT IN (SELECT t2.id FROM t2 WHERE t2.id = t1.id) 
ORDER BY id;
   -- 2, 4, NULL
   ```
   
   Same as DuckDB 1.5.6. I think this can be closed.
   


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