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https://issues.apache.org/jira/browse/FLINK-23384?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17380573#comment-17380573
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Timo Walther commented on FLINK-23384:
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Also: Remove the special logic introduced in FLINK-23188 due to this issue.
> Use upper case name for all BuiltInFunctionDefinitions
> ------------------------------------------------------
>
> Key: FLINK-23384
> URL: https://issues.apache.org/jira/browse/FLINK-23384
> Project: Flink
> Issue Type: Sub-task
> Components: Table SQL / API
> Reporter: Timo Walther
> Priority: Major
>
> Currently, some functions in BuiltInFunctionDefinitions use camel case names.
> This is mostly due to historical reasons when using the string-based Java
> expression API. Once {{ExpressionParser}} is dropped we can also normalize
> the names.
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