Function execute_with_writer 

pub fn execute_with_writer(
    plan: &LogicalPlan,
    store: &RocksDbStorageEngine,
    writer: &dyn GraphWriter,
) -> Result<Vec<Row>>

Execute a plan against a local RocksDbStorageEngine for reads, sending mutations to a separate GraphWriter. Used by in-process setups where reads are always cheap-local (single node or full-replica Raft). No parameters.