Provided by: libattean-perl_0.021-1_all
Attean::Plan - Representation of SPARQL query plan operators
This document describes Attean::Plan version 0.021
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::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
Please report any bugs or feature requests to through the GitHub web interface at <https://github.com/kasei/attean/issues>.
Gregory Todd Williams "<email@example.com>"
Copyright (c) 2014--2018 Gregory Todd Williams. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.