alamb commented on code in PR #8691:
URL: https://github.com/apache/arrow-datafusion/pull/8691#discussion_r1439064211
##########
datafusion/optimizer/src/simplify_expressions/expr_simplifier.rs:
##########
@@ -481,6 +481,14 @@ impl<'a, S: SimplifyInfo> TreeNodeRewriter for
Simplifier<'a, S> {
lit(negated)
}
+ // null in (x, y, z) --> null
Review Comment:
I double checked that this is consistent with posgres:
```sql
postgres=# select null IN (1,2);
?column?
----------
(1 row)
postgres=# select null IN (NULL);
?column?
----------
(1 row)
postgres=# select null NOT IN (1,2);
?column?
----------
(1 row)
postgres=# select null NOT IN (NULL,1,2);
?column?
----------
(1 row)
```
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