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AtteanX::API::JoinRotatingPlanner

Query planning role to produce alternative join plans

This document describes AtteanX::API::JoinRotatingPlanner version 0.012

The AtteanX::API::JoinRotatingPlanner role, when used with Attean::QueryPlanner, produces alternatives for join query plans. Specifically, joins of the form (A⋈B)⋈C are rotated to A⋈(B⋈C), with the ability to coalesce B⋈C (e.g. for adjacent BGPs).

"allow_join_rotation( $join_plan )"
Returns true if join rotation should be attempted on the given join plan.
"coalesce_rotated_join( $join_plan )"
Given a Attean::API::Plan::Join plan $join_plan, returns a list of equivalent plans. This is useful when the join can be reduced to a more fundamental plan type, such as merging two adjacent BGP plans into a single plan.

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.