//! Module: predicate::row_policy
//! Responsibility: missing-row handling policy shared by query/executor layers.
//! Does not own: predicate expression semantics.
//! Boundary: consumed by query plan builders and executor flows.
///
/// MissingRowPolicy
///
/// Missing-row handling policy for query execution.
///
/// This is a domain-level contract shared by query planning and executor
/// runtime behavior.
///