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https://issues.apache.org/jira/browse/CALCITE-2460?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16851178#comment-16851178
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Julian Hyde commented on CALCITE-2460:
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Per my reading of
https://dev.mysql.com/doc/refman/5.6/en/string-functions.html#function_from-base64,
FROM_BASE64 may return NULL even if its argument is NOT NULL. (If the argument
is not a valid base64 string.) This is a little unusual, so be sure to test.
TO_BASE64 is more usual: its return is NOT NULL if and only if its argument is
NOT NULL.
> 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
> 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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