[FLINK-14473] Support nested field as the rowtime attribute

• Type: Sub-task
• Status: Closed
• Priority: Major
• Resolution: Won't Fix
• Component/s: Table SQL / API, Table SQL / Planner
• Assignee: Unassigned
• Reporter: Jark Wu
• Created: 21/Oct/19 07:30
• Updated: 02/Apr/21 06:26
• Resolved: 02/Apr/21 06:26

Description

As described in FLIP-66, in theory, the expected rowtime field can be a nested field in schema. But this requires a big refactoring for current planner, because planner assumes that time attribute can only be top-level, and all the time indicator is represented as a single integer.

All of them need to be refactored, using a new structure to represent the position of time attribute, and a generated function to access the time attribute.

Btw, this is not a blocker of FLIP-66, because users can use computed column to access the nested fields in DDL to avoid defining a nested time attribute.