NAME

       Attean::AggregateExpression - Representation of aggregate expression trees

VERSION

       This document describes Attean::AggregateExpression version 0.012

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

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

AUTHOR

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

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.