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https://issues.apache.org/jira/browse/BEAM-3345?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16322763#comment-16322763
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Anton Kedin commented on BEAM-3345:
-----------------------------------
Rejecting unsupported triggers conflicts with triggers created by the
HOP/TUMBLE expressions.
Blocked by [BEAM-3360]
> [SQL] Reject Unsupported Joins
> ------------------------------
>
> Key: BEAM-3345
> URL: https://issues.apache.org/jira/browse/BEAM-3345
> Project: Beam
> Issue Type: Task
> Components: dsl-sql
> Reporter: Anton Kedin
> Assignee: Anton Kedin
>
> Related to https://issues.apache.org/jira/browse/BEAM-3190 .
> We don't know what meaningful join semantics is, in presence of multiple
> trigger firings. I.e. in accumulating mode it will result in multiple
> duplicated join results, and in discarding mode it will only join deltas,
> both of these scenarios seem to be super subtle and can lead to
> misunderstanding and misuse by the end users.
> Until we have a way to implement a correct join semantics (e.g. using
> retractions) we should reject unsupported window/trigger combinations.
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