Hi,

Wanted to gather feedback on changes I propose to the behavior of some
aspects of windowing and triggering in Beam SQL.

In short:

Beam SQL currently overrides input PCollections' windowing/triggering
configuration in few cases. For example if a query has a simple GROUP BY
clause, we would apply GlobalWindows. And it's not configurable by the
user, it happens under the hood of SQL.

Proposal is to update the Beam SQL implementation in these cases to avoid
changing the input PCollections' configuration as much as possible.

More details here:
https://docs.google.com/document/d/1RmyV9e1Qab-axsLI1WWpw5oGAJDv0X7y9OSnPnrZWJk

Regards,
Anton

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