[BEAM-3759] Add support for PaneInfo descriptor in Python SDK

• Type: Improvement
• Status: Open
• Priority: P2
• Resolution: Unresolved
• Affects Version/s: 2.3.0
• Fix Version/s: 2.19.0
• Component/s: sdk-py-core
• Labels: stale-P2
• Assignee: Unassigned
• Reporter: Charles Chen
• Created: 27/Feb/18 23:54
• Updated: 26/Jul/20 17:05

Description

The PaneInfo descriptor allows a user to determine which particular triggering emitted a value.  This allows the user to differentiate between speculative (early), on-time (at end of window) and late value emissions coming out of a GroupByKey.  We should add support for this feature in the Python SDK.

Issue Links

• links to: GitHub Pull Request #4763