NAME

Attean::AggregateExpression - Representation of aggregate expression trees

VERSION

This document describes Attean::AggregateExpression version 0.021

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.

BUGS

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

SEE ALSO

AUTHOR

Gregory Todd Williams <gwilliams@cpan.org>

COPYRIGHT

Copyright (c) 2014--2018 Gregory Todd Williams. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.