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Attean::API::Plan - Query plan

Attean::API::Plan(3pm) User Contributed Perl Documentation Attean::API::Plan(3pm)

NAME

Attean::API::Plan - Query plan

VERSION

This document describes Attean::API::Plan version 0.017

DESCRIPTION

The Attean::API::Plan role defines a common API for all query plans.

ATTRIBUTES

"cost"
"distinct"
"item_type"
"in_scope_variables"
"ordered"

REQUIRED METHODS

The following methods are required by the Attean::API::Plan role:
"impl( $model )"
Returns a code reference that when called (without arguments), returns an Attean::API::Iterator object.

METHODS

"has_cost"
"as_string"
Returns a tree-structured string representation of this plan, including children.
"evaluate( $model )"
Evaluates this plan and returns the resulting iterator.
"in_scope_variables_union( @plans )"
Returns the set union of "in_scope_variables" of the given plan objects.
"subplans_of_type_are_variable_connected( $type )"
Returns true if the subpatterns of the given $type are all connected through their "in_scope_variables", false otherwise (implying a cartesian product if the connecting plans perform some form of join.
"children_are_variable_connected( $type )"
Returns true if the children of this plan are all connected through their "in_scope_variables", false otherwise (implying a cartesian product if this plan performs some form of 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 (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.
2017-10-02 perl v5.26.0