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Attean::Plan

Representation of SPARQL query plan operators

This document describes Attean::Plan version 0.012

  use v5.14;
  use Attean;

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::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

Please report any bugs or feature requests to through the GitHub web interface at <https://github.com/kasei/attean/issues>.

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

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.