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Attean::AggregateExpression

Representation of aggregate expression trees

This document describes Attean::AggregateExpression version 0.012

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:

"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.

Please report any bugs or feature requests to through the GitHub web interface at <https://github.com/kasei/attean/issues>.

<http://www.perlrdf.org/>

Gregory Todd Williams "<gwilliams@cpan.org>"

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.