NAME

Attean::QueryPlanner - Query planner

VERSION

This document describes Attean::QueryPlanner version 0.010

SYNOPSIS

  use v5.14;
  use Attean;
  my $planner = Attean::QueryPlanner->new();
  my $default_graphs = [ Attean::IRI->new('http://example.org/') ];
  my $plan = $planner->plan_for_algebra( $algebra, $model, $default_graphs );
  my $iter = $plan->evaluate($model);
  my $iter = $e->evaluate( $model );

DESCRIPTION

The Attean::QueryPlanner class implements a query planner using the iterative dynamic programming approach.

ATTRIBUTES

METHODS

plans_for_algebra( $algebra, $model, \@active_graphs, \@default_graphs )

Returns Attean::API::Plan objects representing alternate query plans for evaluating the query $algebra against the $model, using the supplied $active_graph.

bgp_join_plans( $bgp, $model, \@active_graphs, \@default_graphs, \@interesting_order, \@plansA, \@plansB, ... )

Returns a list of alternative plans for the join of a set of triples. The arguments @plansA, @plansB, etc. represent alternative plans for each triple participating in the join.

group_join_plans( $model, \@active_graphs, \@default_graphs, \@interesting_order, \@plansA, \@plansB, ... )

Returns a list of alternative plans for the join of a set of sub-plans. The arguments @plansA, @plansB, etc. represent alternative plans for each sub-plan participating in the join.

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 Gregory Todd Williams. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.