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https://issues.apache.org/jira/browse/CALCITE-2460?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16852910#comment-16852910
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TANG Wen-hui commented on CALCITE-2460:
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[~julianhyde] Thanks for your review. And  I might not have the right to change 
the JIRA case tittle since it was not reported by me.  As for TO_BASE64, Mysql 
specifies that "Converts the string argument to base-64 encoded form and 
returns the result as a character string with the connection character set and 
collation. " 
[https://dev.mysql.com/doc/refman/8.0/en/string-functions.html#function_to-base64.]
  Is it must to change its argument to BINARY or VARBINARY?

> Add implementation of To_Base64 to SqlFunctions
> -----------------------------------------------
>
>                 Key: CALCITE-2460
>                 URL: https://issues.apache.org/jira/browse/CALCITE-2460
>             Project: Calcite
>          Issue Type: Improvement
>            Reporter: vinoyang
>            Priority: Minor
>              Labels: pull-request-available
>          Time Spent: 2h 50m
>  Remaining Estimate: 0h
>
> refer to mysql TO_BASE64 function : 
> [https://dev.mysql.com/doc/refman/5.6/en/string-functions.html#function_to-base64]



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