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https://issues.apache.org/jira/browse/FLINK-17377?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17092195#comment-17092195
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Jark Wu commented on FLINK-17377:
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Some more information, Hive also supports variable substitution:
https://cwiki.apache.org/confluence/display/Hive/LanguageManual+VariableSubstitution
> Support variable substitution in Flink SQL
> ------------------------------------------
>
> Key: FLINK-17377
> URL: https://issues.apache.org/jira/browse/FLINK-17377
> Project: Flink
> Issue Type: New Feature
> Components: Table SQL / API, Table SQL / Client
> Affects Versions: 1.10.0
> Reporter: Guangbin Zhu
> Priority: Major
>
> FlinkSQL does not support variable substitution like hive.
> {code:java}
> SET k1=v1;
> Select * from table where key=${k1}{code}
> This is a common and great useful feature that Flink should support.
>
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