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https://issues.apache.org/jira/browse/FLINK-6587?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16012507#comment-16012507
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ASF GitHub Bot commented on FLINK-6587:
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Github user twalthr commented on the issue:
https://github.com/apache/flink/pull/3923
@shaoxuan-wang the function catalog is case insensitive anyway. With this
PR we have almost no keywords anymore. So a "sum" could be overwritten by "SUM".
> Java Table API cannot parse function names starting with keywords
> -----------------------------------------------------------------
>
> Key: FLINK-6587
> URL: https://issues.apache.org/jira/browse/FLINK-6587
> Project: Flink
> Issue Type: Bug
> Components: Table API & SQL
> Reporter: Timo Walther
> Assignee: Timo Walther
>
> The ExpressionParser of the Java Table API has problems with functions that
> start with a reserved keyword. e.g. a function must not be called {{summing}}
> because {{sum}} is reserved.
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