extract_node_value

# File activerecord/lib/active_record/relation/where_clause.rb, line 169
        def extract_node_value(node)
          case node
          when Array
            node.map { |v| extract_node_value(v) }
          when Arel::Nodes::Casted, Arel::Nodes::Quoted
            node.val
          when Arel::Nodes::BindParam
            value = node.value
            if value.respond_to?(:value_before_type_cast)
              value.value_before_type_cast
            else
              value
            end
          end
        end