[BEAM-12011] WindowFn.getOutputTime break joins, adds needless complexity

• Type: Bug
• Status: Resolved
• Priority: P2
• Resolution: Fixed
• Fix Version/s: 2.30.0
• Component/s: beam-model
• Assignee: Kenneth Knowles
• Reporter: Kenneth Knowles
• Created: 18/Mar/21 04:18
• Updated: 15/May/21 18:12
• Resolved: 15/May/21 18:12

Description

See https://lists.apache.org/thread.html/r99d0efa70f83815e17a1dbfb94effd16b38176046ac8ffbfe371c895%40%3Cdev.beam.apache.org%3E

The consensus is that we really shouldn't be producing weird output, even if it causes a watermark problem we should solve it another way. It breaks CoGBK joins, and new runner authors have even missed the existence of the need to call into a UDF (hence implementing SlidingWindows the natural way instead of this strange way)

Issue Links

• links to: GitHub Pull Request #14268
• links to: GitHub Pull Request #14650