MarkLogic Server 11.0 Product Documentationop: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()