Function boundedness_from_children 

pub(crate) fn boundedness_from_children<'a>(
    children: impl IntoIterator<Item = &'a Arc<dyn ExecutionPlan>>,
) -> Boundedness

Utility to determine an operator’s boundedness based on its children’s boundedness.

Assumes boundedness can be inferred from child operators:

• Unbounded (requires_infinite_memory: true) takes precedence.
• Unbounded (requires_infinite_memory: false) is considered next.
• Otherwise, the operator is bounded.

Note: This is a general-purpose utility and may not apply to all multi-child operators. Ensure your operator’s behavior aligns with these assumptions before using.