Inserting a document and reading it in same transaction in MarkLogic - xquery

Question

Below is the code snippet I am using for one of the functionality
declare function local:matchCounts($Id as xs:string, $status as xs:string) as xs:int {
xdmp:estimate(cts:search(/count, cts:and-query((
cts:element-attribute-value-query(xs:QName("count"), xs:QName("Id"), $Id, "exact"),
cts:element-attribute-value-query(xs:QName("child"), xs:QName("MatchStatus"), $status, "exact")
)), "unfiltered"))
};
declare function local:saveCountsMatchC($Id as xs:string) {
let $evenCount := local:matchCounts($Id, "even")
let $oddCount := local:matchCounts($Id, "odd")
return ($evenCount, $oddCount)
};
declare function local:matchingProcess($Id as xs:string) {
let $total-records := 1000
let $batch-size := 50
let $pagination := 0
let $bs :=
for $records in 1 to fn:ceiling($total-records div $batch-size )
let $start := fn:sum($pagination + 1)
let $end := fn:sum($batch-size + $pagination)
let $_ := xdmp:set($pagination, $end)
return
xdmp:spawn-function
(
function() {
for $each at $pos in ($start to $end)
let $id := sem:uuid-string()
let $xml := if(($pos mod 2) eq 0) then <count Id='{$Id}'><child MatchStatus='even'></child></count>
else <count Id='{$Id}'><child MatchStatus='odd'></child></count>
return xdmp:document-insert(concat("/", $id, ".xml"), $xml)
},
<options xmlns="xdmp:eval"><result>{fn:true()}</result><commit>auto</commit><update>true</update></options>
)
let $_ := $bs
return local:saveCountsMatchC($Id)
};
local:matchingProcess("1")
The requirement over here is to iterate 1000 documents using batch size of 50, so basically I am using spawn function to create 20 batches of size 50 which inserts 1000 documents in my database.
Once those documents are inserted, I need to read those documents in same transaction. Here 500 documents have MatchStatus='odd' and 500 documents have MatchStatus='even'
The query should return (500,500) as output; Instead it returns (0,0)
I am using <result>{fn:true()}</results> option so that my next statement waits for all spawn task to be completed, but its not happeneing.
Can anybody help me with the requirement?
Note: Need to insert 1000 documents and then read them in same function call only

Answer 1

Your code that executes the spawns does not perform updates itself, so will run in so-called query mode. In query mode only updates from before the start of the code are visible.
You could try running in update mode (declare option xdmp:transaction-mode "update";), but usually it is easier to just spawn or eval the counting/reading of your updates as well. E.g. wrap the xdmp:estimate in an xdmp:spawn-function with result true as well.
HTH!