[FLINK-20029] Fix computed column can't be defined on the metadata column

• Type: Sub-task
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.12.0
• Fix Version/s: 1.12.0
• Component/s: Connectors / Kafka, Table SQL / API
• Labels: pull-request-available
• Assignee: Timo Walther
• Reporter: Shengkai Fang
• Created: 06/Nov/20 13:12
• Updated: 12/Nov/20 15:18
• Resolved: 12/Nov/20 15:18

Description

Currenlty it's not allowed to define the computed column on metadata. It's very useful when users extract the metadata from record and use the information as watermark. 

Issue Links

• links to: GitHub Pull Request #14048