Batch processing in marklogic with spawn function

batch-processing-with-spawn-function.xqy

xquery version "1.0-ml";
let $input := for $i in (1 to 100) return $i
let $batch-size := 2
let $input-size := fn:count($input)
let $num-batches :=  xs:int(math:ceil($input-size div $batch-size ))
let $result :=
for $batch-start in (1 to $num-batches)
  let $processing-seq := $input[($batch-size * ($batch-start - 1) + 1)  to ($batch-size * ($batch-start ))]
  return
    xdmp:spawn-function(function() {
    fn:string-join($processing-seq ! fn:string(.),",")
    }, 
    <options xmlns="xdmp:eval">
      <result>true</result>
      <transaction-mode>update-auto-commit</transaction-mode>
    </options>)

return ($result)