Attean::AggregateExpression(3) Representation of aggregate expression trees


This document describes Attean::AggregateExpression version 0.017


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)).


This role consumes the Attean::API::AggregateExpression role.


The following attributes exist:
The name of the aggregate operator, from the allowable set: COUNT, SUM, MIN, MAX, AVG, GROUP_CONCAT, SAMPLE.
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.
A boolean indicating whether the aggregate should operate over distinct term sets, or full multisets.
A Attean::API::Variable object which will be bound to the produced aggregate value in results.


Please report any bugs or feature requests to through the GitHub web interface at <>.


Gregory Todd Williams "<[email protected]>"


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.