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https://issues.apache.org/jira/browse/FLINK-7217?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Flink Jira Bot updated FLINK-7217:
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Labels: auto-deprioritized-major auto-deprioritized-minor (was:
auto-deprioritized-major stale-minor)
Priority: Not a Priority (was: Minor)
This issue was labeled "stale-minor" 7 days ago and has not received any
updates so it is being deprioritized. If this ticket is actually Minor, please
raise the priority and ask a committer to assign you the issue or revive the
public discussion.
> Give hints about unsupported SQL / Table API features.
> ------------------------------------------------------
>
> Key: FLINK-7217
> URL: https://issues.apache.org/jira/browse/FLINK-7217
> Project: Flink
> Issue Type: Improvement
> Components: Table SQL / API
> Reporter: Fabian Hueske
> Priority: Not a Priority
> Labels: auto-deprioritized-major, auto-deprioritized-minor
>
> The Table API and SQL do not support every type of query. While being valid
> SQL, we cannot translate certain queries into execution plans. Especially,
> the supported syntax of streaming queries is limited and will probably always
> be limited.
> Therefore it is important to explain a user why a query could not be
> translated. The problem here is that we need to wait for the optimizer to
> explore the full search space and apply all transformation rules before we
> can tell the user that the query could not be translated. Hence, we cannot
> simply throw an exception if a rule cannot be applied, because another rule
> might succeed. If we throw an exception in the optimizer, we would kill the
> exploration and miss a valid plan. However, after the optimizer failed, we
> are missing the complete context and cannot provide valuable feedback beyond
> "query uses an unsupported feature".
> We should try to improve the situation and provide better feedback to users.
> One approach would be that rules collect possible reasons why they could not
> be applied and these reasons are returned to the user when the translation
> fails.
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