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Attean::Plan - Representation of SPARQL query plan operators

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

NAME

Attean::Plan - Representation of SPARQL query plan operators

VERSION

This document describes Attean::Plan version 0.017

SYNOPSIS

  use v5.14;
  use Attean;

DESCRIPTION

This is a utility package that defines all the Attean query plan classes in the Attean::Plan namespace:
Attean::Plan::Quad
 
Evaluates a quad pattern against the model.
Attean::Plan::NestedLoopJoin
 
Evaluates a join (natural-, anti-, or left-) using a nested loop.
Attean::Plan::HashJoin
 
Evaluates a join (natural-, anti-, or left-) using a hash join.
Attean::Plan::Construct
Attean::Plan::Describe
Attean::Plan::EBVFilter
 
Filters results from a sub-plan based on the effective boolean value of a named variable binding.
Attean::Plan::Merge
 
Evaluates a set of sub-plans, returning the merged union of results, preserving ordering.
Attean::Plan::Union
 
Evaluates a set of sub-plans, returning the union of results.
Attean::Plan::Extend
 
Evaluates a sub-plan, and extends each result by evaluating a set of expressions, binding the produced values to new variables.
Attean::Plan::HashDistinct
 
Evaluates a sub-plan, and returns distinct results by checking a persistent hash of already-seen results.
Attean::Plan::Unique
 
Evaluates an already-ordered sub-plan, and returns distinct results by filtering out sequential duplicates.
Attean::Plan::Slice
 
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").
Attean::Plan::Project
 
Evaluates a sub-plan and returns projected results by only keeping a fixed-set of variable bindings in each result.
Attean::Plan::OrderBy
 
Evaluates a sub-plan and returns the results after fully materializing and sorting is applied.
Attean::Plan::Service
 
Evaluates a SPARQL query against a remove endpoint.
Attean::Plan::Table
 
Returns a constant set of results.
Attean::Plan::Iterator
 
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.
Attean::Plan::ALPPath
Attean::Plan::Exists
 
Returns an iterator containing a single boolean term indicating whether any results were produced by evaluating the sub-plan.
Attean::Plan::Aggregate

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