AtteanX::API::JoinRotatingPlanner(3)
Query planning role to produce alternative join plans
VERSION
This document describes AtteanX::API::JoinRotatingPlanner version 0.017
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.
COPYRIGHT
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.
