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https://issues.apache.org/jira/browse/FLINK-6587?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16012438#comment-16012438
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ASF GitHub Bot commented on FLINK-6587:
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Github user shaoxuan-wang commented on the issue:
https://github.com/apache/flink/pull/3923
@twalthr, it seems we have reserved the keyword with the case insensitive.
For instance, we cannot use "Sum" and "SUM", as "sum" is reserved. Did we
intent to filter the keyword like this?
> 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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