[FLINK-11398] Add a dedicated phase to materialize time indicators for nodes produce updates

• Type: Improvement
• Status: Open
• Priority: Minor
• Resolution: Unresolved
• Component/s: Table SQL / Planner
• Assignee: Unassigned
• Reporter: Hequn Cheng
• Created: 21/Jan/19 14:10
• Updated: 19/Nov/21 15:12

Description

As discussed here, we need a dedicated phase to materialize time indicators for nodes produce updates.

Details:
Currently, we materialize time indicators in `RelTimeInidicatorConverter`. We need to introduce another materialize phase that materializes all time attributes on nodes that produce updates. We can not do it inside `RelTimeInidicatorConverter`, because only later, after physical optimization phase, we know whether it is a non-window outer join which will produce updates

There are a few other things we need to consider.

• Whether we can unify the two converter phase.
• Take window with early fire into consideration(not been implemented yet). In this case, we don't need to materialize time indicators even it produces updates.