Attean::Plan - Online Linux Manual PageSection : 3
Updated : 2021-02-08
Source : perl v5.32.1
Note : User Contributed Perl Documentation
NAMEAttean::Plan − Representation of SPARQL query plan operators
VERSIONThis document describes Attean::Plan version 0.030
SYNOPSIS​ use v5.14; ​ use Attean;
DESCRIPTIONThis 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 remote 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
BUGSPlease report any bugs or feature requests to through the GitHub web interface at <https://github.com/kasei/attean/issues>.
SEE ALSO
AUTHORGregory Todd Williams <gwilliams@cpan.org>
COPYRIGHTCopyright (c) 2014−−2020 Gregory Todd Williams. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. 0
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