Attean::AggregateExpression(3)
Representation of aggregate expression trees
VERSION
This document describes Attean::AggregateExpression version 0.017
DESCRIPTION
The Attean::AggregateExpression class represents an expression tree where the
root node is an aggregate operation (e.g. SUM(?a) or COALESCE(?a/?b, ?c, 0)).
ROLES
This role consumes the Attean::API::AggregateExpression role.
ATTRIBUTES
The following attributes exist:
- "operator"
-
The name of the aggregate operator, from the allowable set: COUNT, SUM, MIN,
MAX, AVG, GROUP_CONCAT, SAMPLE.
- "scalar_vars"
-
A HASH reference of scalar variables. The only scalar variable defined for
SPARQL 1.1 is 'seperator', a string separator used with the GROUP_CONCAT
aggregate.
- "distinct"
-
A boolean indicating whether the aggregate should operate over distinct term sets, or full multisets.
- "variable"
-
A Attean::API::Variable object which will be bound to the produced aggregate value in results.
COPYRIGHT
Copyright (c) 2014--2016 Gregory Todd Williams.
This program is free software; you can redistribute it and/or modify it under
the same terms as Perl itself.
