[CALCITE-137] If a subset is created that is subsumed by an existing subset, its "best" is not assigned

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Labels: github-import
• Assignee: Unassigned
• Reporter: GitHub Import
• Created: 18/Jun/14 08:16
• Updated: 18/Jun/14 08:16
• Resolved: 18/Jun/14 08:16

Description

Suppose that there is a subset S1 sorted on [0, 1] and we create a subset S2 in the same set that is sorted on [0]. All of the relational expressions that are in S1 will fall into S2. Therefore if S1 has a "best" relational expression, S2 should have one too.

We were failing to do this. S2's bestCost was set correctly, but best was left null.

---------------- Imported from GitHub ----------------
Url: https://github.com/julianhyde/optiq/issues/137
Created by: julianhyde
Labels:
Created at: Fri Feb 14 03:49:11 CET 2014
State: closed