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https://issues.apache.org/jira/browse/CALCITE-6260?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17819645#comment-17819645
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EveyWu commented on CALCITE-6260:
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[~caicancai] Thank you for your advice, I will split multiple jira.
> Add already implemented functions in Spark library
> --------------------------------------------------
>
> Key: CALCITE-6260
> URL: https://issues.apache.org/jira/browse/CALCITE-6260
> Project: Calcite
> Issue Type: Improvement
> Reporter: EveyWu
> Priority: Minor
> Labels: pull-request-available
> Attachments: image-2024-02-22-21-09-22-394.png
>
>
> Add Spark functions that have been implemented but have different
> OperandTypes/Returns.
> Spark Functions Link：[https://spark.apache.org/docs/latest/api/sql/index.html]
> Add function List：
> * CHR
> * CONCAT_WS
> * REGEXP
> * REVERSE
>
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