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JavaScript ModifyPlan.prototype.offsetLimit

MarkLogic 12 EA 1 Product Documentation
op:offset-limit

op:offset-limit(
   $plan as map:map,
   $start as item(),
   $length as item()
) as map:map

Summary

This method returns a subset of the rows in the result set by skipping the number of rows specified by start and returning the remaining rows up to the length limit.

A common pattern is to page over a result set by using a op:param placeholder parameter for the start and specifying the starting value in bindings for op:result. This approach reuses the cached query instead of recalculating the query on each request.

Parameters
$plan The Optic Plan. You can either use the XQuery => chaining operator or specify the variable that captures the return value from the previous operation.
$start The number of rows to skip. Default is 1.
$length The maximum number of rows to return.

Example

xquery version "1.0-ml";

import module namespace op="http://marklogic.com/optic"
     at "/MarkLogic/optic.xqy";

let $employees := op:from-view("main", "employees")
let $expenses  := op:from-view("main", "expenses")
let $totalexpenses  := op:col("totalexpenses")
return $employees
   => op:join-inner($expenses, op:on(
                    op:view-col("employees", "EmployeeID"),
                    op:view-col("expenses", "EmployeeID")))
   => op:group-by(op:view-col("employees", "EmployeeID"),
                 ("FirstName", "LastName",
                  op:view-col("expenses", "Category"),
                  op:sum($totalexpenses,
                  op:view-col("expenses", "Amount"))))
   => op:order-by(op:view-col("employees", "EmployeeID"))
   => op:offset-limit(2, 2)
   => op:result()

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