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Support interval windows when used with timers. Largely plumbs the awareness of the input collection's window coder type, with a stop gap for custom windowFns.

In the future, we may wish to fully move to the "error free" decoder style for dealing with windows and elements, and avoid io.Reader/io.Writer indirection. This would be preferable to putting Custom window fun machinery into the SDK, without the SDK being a user itself, and would avoid unnecessary error handling.

Fixes #32121.


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LGTM

@lostluck lostluck merged commit c197e4f into apache:master Aug 15, 2024
@lostluck lostluck deleted the beam32121 branch August 15, 2024 16:34
reeba212 pushed a commit to reeba212/beam that referenced this pull request Dec 4, 2024
* [apache#32121] Support timers in interval windows.

* fix test

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Co-authored-by: lostluck <13907733+lostluck@users.noreply.github.com>
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[prism] Support interval windows/prep for custom windows.

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