Kenneth Knowles created BEAM-4721:
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Summary: WindowingStrategy, Window fields in the project as a
trait of a Rel
Key: BEAM-4721
URL: https://issues.apache.org/jira/browse/BEAM-4721
Project: Beam
Issue Type: New Feature
Components: dsl-sql
Reporter: Kenneth Knowles
Currently, WindowingStrategy is just a property of a PCollection but is unknown
during planning. As with boundedness / unboundedness, this should be available
statically so it can affect the plan. It may not be literally a
WindowingStrategy object, but a SQL-level equivalent.
One windowing-related thing that is interesting is which fields represent the
window. If we know this, then we know we can support per-window equijoins as
long as a join condition also does an equijoin on the window.
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