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https://issues.apache.org/jira/browse/FLINK-13569?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16899889#comment-16899889
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Timo Walther commented on FLINK-13569:
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But what are the implications of using identifier? Can users use reserved
keywords in those properties or do they need to escape them with {{` `}}?
> DDL table property key is defined as indentifier but should be string literal
> instead
> -------------------------------------------------------------------------------------
>
> Key: FLINK-13569
> URL: https://issues.apache.org/jira/browse/FLINK-13569
> Project: Flink
> Issue Type: Bug
> Components: Table SQL / API
> Reporter: Xuefu Zhang
> Priority: Major
> Fix For: 1.9.0, 1.10.0
>
>
> The key name should be any free text, and should not be constrained by the
> identifier grammar.
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