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JavaScript op.rollup

MarkLogic 12 EA 1 Product Documentation
op:rollup

op:rollup(
   $columns as columnIdentifier+
) as map:map+

Summary

This function specifies a list of grouping keys for a group and returns that group and larger groups (including all rows) formed by dropping columns from right to left. The result is used for building the first parameter for the op:group-by-union or op:group-to-arrays functions.

Parameters
$columns The columns to use as grouping keys. The columns can be named with a string or a column parameter function such as op:col or constructed from an expression with op:as.

Usage Notes

The following call 

       op:rollup(("Category", "Location"))

produces the same groups as the following calls 

       (op:group(("Category", "Location")),
        op:group("Category"),
        op:group())

Example

xquery version "1.0-ml";

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

op:from-view("main", "expenses")
    => op:group-by-union(
        op:rollup(("Category", "Location")),
        op:sum("TotalAmount", "Amount")
        )
    => op:order-by(("Category", "Location"))
    => op:result()

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