Attean::Plan - Representation of SPARQL query plan operators
This document describes Attean::Plan version 0.033
This is a utility package that defines all the Attean query plan classes in the Attean::Plan namespace:
Evaluates a quad pattern against the model.
Evaluates a join (natural-, anti-, or left-) using a nested loop.
Evaluates a join (natural-, anti-, or left-) using a hash join.
Filters results from a sub-plan based on the effective boolean value of a named variable binding.
Evaluates a set of sub-plans, returning the merged union of results, preserving ordering.
Evaluates a set of sub-plans, returning the union of results.
Evaluates a sub-plan, and extends each result by evaluating a set of expressions, binding the produced values to new variables.
Evaluates a sub-plan, and returns distinct results by checking a persistent hash of already-seen results.
Evaluates an already-ordered sub-plan, and returns distinct results by filtering out sequential duplicates.
Evaluates a sub-plan, and returns the results after optionally skipping some number of results ("offset") and limiting the total number of returned results ("limit").
Evaluates a sub-plan and returns projected results by only keeping a fixed-set of variable bindings in each result.
Evaluates a sub-plan and returns the results after fully materializing and sorting is applied.
Evaluates a SPARQL query against a remote endpoint.
Returns a constant set of results.
Be aware that if the iterator being wrapped is not repeatable (consuming the Attean::API::RepeatableIterator role), then this plan may only be evaluated once.
A size estimate may be given if it is available. If the iterator is an Attean::ListIterator, the size of that iterator will be used.
Returns an iterator containing a single boolean term indicating whether any results were produced by evaluating the sub-plan.
Please report any bugs or feature requests to through the GitHub web interface at https://github.com/kasei/attean/issues.
Gregory Todd Williams <firstname.lastname@example.org>
Copyright (c) 2014--2022 Gregory Todd Williams. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
To install Attean, copy and paste the appropriate command in to your terminal.
perl -MCPAN -e shell
For more information on module installation, please visit the detailed CPAN module installation guide.