NAME

       Attean::Plan - Representation of SPARQL query plan operators

VERSION

       This document describes Attean::Plan version 0.033

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 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

BUGS

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

SEE ALSO

AUTHOR

       Gregory Todd Williams  "<gwilliams@cpan.org>"

COPYRIGHT

       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.

perl v5.36.0                                       2022-10-06                                  Attean::Plan(3pm)