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// Physical operator implementations
/// Aggregate operator (GROUP BY / count / etc.).
/// CREATE clause execution (nodes and edges).
/// DELETE / DETACH DELETE execution.
/// Single-hop edge expansion.
/// Filter operator (WHERE predicates).
/// Hyperedge scan operator (hypergraph feature).
/// Index-based node lookup.
/// LIMIT / SKIP operators.
/// MERGE clause execution (match-or-create).
/// Full node scan (with optional label filter).
/// OPTIONAL MATCH (left-join) expansion.
/// RETURN / WITH projection.
/// SET property assignment.
/// ORDER BY sort operator.
/// Subgraph scan operator (subgraph feature).
/// Temporal edge validity filtering (AT TIME / BETWEEN TIME).
/// Version-store scan for AT TIME / BETWEEN TIME queries.
/// UNWIND list expansion.
/// Variable-length path expansion (BFS with depth bounds).
/// WITH clause operator.