Method nullable

src/transform/src/column_knowledge.rs:739–748

(&self)

    }

    fn nullable(&self) -> bool {
        match self {
            DatumKnowledge::Any { nullable } => *nullable,
            DatumKnowledge::Lit { value, .. } => match value {
                Ok(value) => value.iter().next().unwrap().is_null(),
                Err(_) => false,
            },
            DatumKnowledge::Nothing => false,
        }
    }
}

/// Attempts to optimize