[CALCITE-221] When multi-phase planning, Planner should not require each phase to return an implementable plan

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Labels: github-import
• Assignee: Unassigned
• Reporter: GitHub Import
• Created: 18/Jun/14 08:40
• Updated: 18/Jun/14 08:40

Description

If we use `Frameworks.getPlanner` to implement a multi-phase planning process, each phase currently has to be implementable. If the output of phase 0 is not implementable, a `CannotPlanException` will be thrown.

It is reasonable for early (perhaps all) phases to just fire some rules, for example, a phase 0 that converts `ProjectRel` to `WindowRel` throughout the tree.

---------------- Imported from GitHub ----------------
Url: https://github.com/julianhyde/optiq/issues/221
Created by: julianhyde
Labels:
Created at: Tue Apr 01 20:39:52 CEST 2014
State: open