Gerrrr commented on issue #8720:
URL: https://github.com/apache/iceberg/issues/8720#issuecomment-1752127496
```
Flink SQL> SELECT * FROM word_count WHERE cnt = NULL;
+----+--------------------------------+----------------------+
| op | word | cnt |
+----+--------------------------------+----------------------+
Received a total of 0 row
Flink SQL> SELECT * FROM word_count WHERE cnt is NULL;
+----+--------------------------------+----------------------+
| op | word | cnt |
+----+--------------------------------+----------------------+
| +I | zz | <NULL> |
+----+--------------------------------+----------------------+
Received a total of 1 row
Flink SQL> SELECT * FROM word_count WHERE cnt <> NULL;
+----+--------------------------------+----------------------+
| op | word | cnt |
+----+--------------------------------+----------------------+
Received a total of 0 row
Flink SQL> SELECT * FROM word_count w1, word_count w2 WHERE w1.cnt = w2.cnt;
+----+--------------------------------+----------------------+--------------------------------+----------------------+
| op | word | cnt |
word0 | cnt0 |
+----+--------------------------------+----------------------+--------------------------------+----------------------+
Received a total of 0 row
```
This behavior seems consistent with the SQL standard.
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