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https://issues.apache.org/jira/browse/BEAM-6110?focusedWorklogId=179153&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-179153
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ASF GitHub Bot logged work on BEAM-6110:
----------------------------------------
Author: ASF GitHub Bot
Created on: 27/Dec/18 17:11
Start Date: 27/Dec/18 17:11
Worklog Time Spent: 10m
Work Description: akedin commented on pull request #7115: [BEAM-6110] For
SQL CoGBK-based join use EARLIEST output timestamp
URL: https://github.com/apache/beam/pull/7115
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Issue Time Tracking
-------------------
Worklog Id: (was: 179153)
Time Spent: 1.5h (was: 1h 20m)
> Beam SQL join moves element timestamps to EOW sometimes, not always
> -------------------------------------------------------------------
>
> Key: BEAM-6110
> URL: https://issues.apache.org/jira/browse/BEAM-6110
> Project: Beam
> Issue Type: Bug
> Components: dsl-sql
> Reporter: Kenneth Knowles
> Assignee: Kenneth Knowles
> Priority: Major
> Time Spent: 1.5h
> Remaining Estimate: 0h
>
> When a CoGBK join is chosen, element timestamps move to EOW. When side input
> or lookup join is chosen, element timestamps are the timestamps from the main
> input element. In SQL sementics, these timestamps are not observable, as
> windowing is assigned at the next GROUP BY. So we just need the output to
> hold the watermark so that nothing becomes late or droppable, which implies
> we need to use MIN timestamp combiner.
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