[FLINK-19874] Apply JoinDeriveNullFilterRule after join reorder

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Implemented
• Fix Version/s: 1.12.0
• Component/s: Table SQL / Planner
• Labels: pull-request-available
• Assignee: Caizhi Weng
• Reporter: Caizhi Weng
• Created: 29/Oct/20 07:22
• Updated: 03/Nov/20 14:07
• Resolved: 03/Nov/20 11:37

Description

JoinDeriveNullFilterRule will filter out null join keys to prevent data skew for joins. Currently this rule is only applied before join reorder. After join reorder the join keys for some inputs might change and we need to apply this rule again.

Issue Links

• links to: GitHub Pull Request #13837