[I] Incorrect result for IS NOT NULL predicate over UNION ALL query [datafusion]

[via GitHub]

findepi opened a new issue, #14352:
URL: https://github.com/apache/datafusion/issues/14352

   ### Describe the bug
   
   Incorrect result for IS NOT NULL predicate over UNION ALL query
   
   ### To Reproduce
   
   ```sql
   SELECT
       a,
       a IS NOT NULL
   FROM (
       SELECT 'foo' AS a, 3 AS b
       UNION ALL
       SELECT NULL AS a, 4 AS b
   )
   ```
   
   DF
   
   ```
   +------+---------------+
   | a    | a IS NOT NULL |
   +------+---------------+
   | NULL | true          |                       😱
   | foo  | true          |
   +------+---------------+
   ```
   
   
   ### Expected behavior
   
   `NULL` valued checked with `IS NOT NULL` should return `false`
   
   ```
   trino> SELECT
       ->     a,
       ->     a IS NOT NULL
       -> FROM (
       ->     SELECT 'foo' AS a, 3 AS b
       ->     UNION ALL
       ->     SELECT NULL AS a, 4 AS b
       -> );
     a   | _col1
   ------+-------
    foo  | true
    NULL | false
   ```
   
   ### Additional context
   
   _No response_


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