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https://issues.apache.org/jira/browse/CALCITE-6892?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17935744#comment-17935744
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Yu Xu commented on CALCITE-6892:
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[~caicancai] Derby Length contains Calcite char_length function can work well
with string, so it is ok for it.
> CHAR_LENGTH Function is not recognized in DerbySQL
> ---------------------------------------------------
>
> Key: CALCITE-6892
> URL: https://issues.apache.org/jira/browse/CALCITE-6892
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.38.0
> Reporter: Yu Xu
> Assignee: Yu Xu
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.40.0
>
>
> Derby is not support CHAR_LENGTH function and it is use LENGTH support it.
> Add LENGTH function in DerbySqlDialect
> we can refer to：[https://db.apache.org/derby/docs/10.17/ref/index.html]
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