to_sql_and_binds

# File activerecord/lib/active_record/connection_adapters/abstract/database_statements.rb, line 17
      def to_sql_and_binds(arel_or_sql_string, binds = [], preparable = nil, allow_retry = false) # :nodoc:
        # Arel::TreeManager -> Arel::Node
        if arel_or_sql_string.respond_to?(:ast)
          arel_or_sql_string = arel_or_sql_string.ast
        end

        if Arel.arel_node?(arel_or_sql_string) && !(String === arel_or_sql_string)
          unless binds.empty?
            raise "Passing bind parameters with an arel AST is forbidden. "                "The values must be stored on the AST directly"
          end

          collector = collector()
          collector.retryable = true

          if prepared_statements
            collector.preparable = true
            sql, binds = visitor.compile(arel_or_sql_string, collector)

            if binds.length > bind_params_length
              unprepared_statement do
                return to_sql_and_binds(arel_or_sql_string)
              end
            end
            preparable = collector.preparable
          else
            sql = visitor.compile(arel_or_sql_string, collector)
          end
          allow_retry = collector.retryable
          [sql.freeze, binds, preparable, allow_retry]
        else
          arel_or_sql_string = arel_or_sql_string.dup.freeze unless arel_or_sql_string.frozen?
          [arel_or_sql_string, binds, preparable, allow_retry]
        end
      end