fix: incorrect nullability of between expr

[jonahgao]

Which issue does this PR close?

None

Rationale for this change

The nullability of the between expression not only depends on the subexpression but may also depend on the low or high expression.

For example

DataFusion CLI v27.0.0

❯ select 1 between null and 2;
+------------------------------------+
| Int64(1) BETWEEN NULL AND Int64(2) |
+------------------------------------+
|                                    |
+------------------------------------+

❯ select 1 between 1 and null;
+------------------------------------+
| Int64(1) BETWEEN Int64(1) AND NULL |
+------------------------------------+
|                                    |
+------------------------------------+

What changes are included in this PR?

fix incorrect nullability of between expr

Are these changes tested?

Yes

Are there any user-facing changes?

No

[alamb]

Thank you @jonahgao - this makes sense to me

[alamb]

👍

[jackwener]

good catch, thank you @jonahgao