NAME

       AtteanX::API::JoinRotatingPlanner - Query planning role to produce alternative join plans

VERSION

       This document describes AtteanX::API::JoinRotatingPlanner version 0.019

DESCRIPTION

       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).

REQUIRED METHODS

       "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.

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--2018 Gregory Todd Williams.  This program is free software; you can
       redistribute it and/or modify it under the same terms as Perl itself.