Gets the routing key for this bound query.

This method will return a non-null value if:

• either all the TableColumns composing the partition key are bound variables of this BoundStatement. The routing key will then be built using the values provided for these partition key TableColumns.
• or the routing key has been set through PreparedStatement.SetRoutingKey for the PreparedStatement this statement has been built from.

Otherwise, null is returned.

Note that if the routing key has been set through PreparedStatement.SetRoutingKey, that value takes precedence even if the partition key is part of the bound variables.

public override RoutingKey RoutingKey { get; }