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https://issues.apache.org/jira/browse/BEAM-4194?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Rui Wang closed BEAM-4194.
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Resolution: Done
Fix Version/s: Not applicable
> [SQL] Support LIMIT on Unbounded Data
> -------------------------------------
>
> Key: BEAM-4194
> URL: https://issues.apache.org/jira/browse/BEAM-4194
> Project: Beam
> Issue Type: New Feature
> Components: dsl-sql
> Reporter: Anton Kedin
> Assignee: Rui Wang
> Priority: Major
> Fix For: Not applicable
>
> Time Spent: 10h 20m
> Remaining Estimate: 0h
>
> We need to support queries with "LIMIT xxx".
> Problem is that we don't know when aggregates will trigger, they can
> potentially accumulate values in global window and never trigger.
> If we have some trigger syntax (BEAM-4193), then the use case becomes similar
> to what we have at the moment, where the user defines the trigger upstream
> for all inputs. In this case LIMIT probably can be implemented as
> sample.any(5) with trigger at count.
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