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https://issues.apache.org/jira/browse/FLINK-15986?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17054699#comment-17054699
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godfrey he commented on FLINK-15986:
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has same doubts as Jark.
{{SET}} command supports changing planner through {{SET
execution.planner=blink/old}}, changing execution mode through {{SET
execution.type=batch/streaming}}, changing time characteristic through {{SET
execution.time-characteristic=event-time/processing-time}}, etc. Switching SQL
dialects you mentioned above is not supported.
> support setting or changing session properties in Flink SQL
> -----------------------------------------------------------
>
> Key: FLINK-15986
> URL: https://issues.apache.org/jira/browse/FLINK-15986
> Project: Flink
> Issue Type: New Feature
> Components: Table SQL / API, Table SQL / Ecosystem
> Reporter: Bowen Li
> Assignee: Kurt Young
> Priority: Critical
> Fix For: 1.11.0
>
>
> as Flink SQL is more and more critical for user running batch jobs,
> experiments, and OLAP exploration, it's important than ever to support
> setting and changing session properties in Flink SQL.
>
> Use cases include switching SQL dialects at runtime, switching job mode
> between "streaming" and "batch", changing other params defined in
> flink-conf.yaml and default-sql-client.yaml
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