where_sql

# File activerecord/lib/arel/select_manager.rb, line 186
    def where_sql(engine = Table.engine)
      return if @ctx.wheres.empty?

      viz = Visitors::WhereSql.new(engine.connection.visitor, engine.connection)
      Nodes::SqlLiteral.new viz.accept(@ctx, Collectors::SQLString.new).value
    end