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https://issues.apache.org/jira/browse/FLINK-18445?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Flink Jira Bot updated FLINK-18445:
-----------------------------------
Labels: auto-deprioritized-major stale-minor (was:
auto-deprioritized-major)
I am the [Flink Jira Bot|https://github.com/apache/flink-jira-bot/] and I help
the community manage its development. I see this issues has been marked as
Minor but is unassigned and neither itself nor its Sub-Tasks have been updated
for 180 days. I have gone ahead and marked it "stale-minor". If this ticket is
still Minor, please either assign yourself or give an update. Afterwards,
please remove the label or in 7 days the issue will be deprioritized.
> Short circuit join condition for lookup join
> --------------------------------------------
>
> Key: FLINK-18445
> URL: https://issues.apache.org/jira/browse/FLINK-18445
> Project: Flink
> Issue Type: Improvement
> Components: Table SQL / Planner
> Reporter: Rui Li
> Priority: Minor
> Labels: auto-deprioritized-major, stale-minor
>
> Consider the following query:
> {code}
> select *
> from probe
> left join
> build for system_time as of probe.ts
> on probe.key=build.key and probe.col is not null
> {code}
> In current implementation, we lookup each probe.key in build to decide
> whether a match is found. A possible optimization is to skip the lookup for
> rows whose {{col}} is null.
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