[CALCITE-3961] VolcanoPlanner.prunedNodes information is lost when duplicate relNode is discarded

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.23.0
• Assignee: Unassigned
• Reporter: Botong Huang
• Created: 27/Apr/20 03:45
• Updated: 24/May/20 11:59
• Resolved: 10/May/20 02:47

Description

VolcanoPlanner.prunedNodes stores the list of relNodes that are marked useless. Whenever the planner see two identical relNode (e.g. when Relsets are merged), one of them are discarded. However, when the preserved node is not in the pruned list while the discarded one is, this pruned information is lost. In general, we should preserve this info whenever duplicate relNodes are discarded.