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https://issues.apache.org/jira/browse/CALCITE-3323?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16923004#comment-16923004
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ShuMing Li commented on CALCITE-3323:
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It's an interesting idea. I don't know how to handle unparsed functions?
Can you give more docs about the implements/ideas?
> Handle arbitrary/unknown functions that have ordinary syntax
> ------------------------------------------------------------
>
> Key: CALCITE-3323
> URL: https://issues.apache.org/jira/browse/CALCITE-3323
> Project: Calcite
> Issue Type: New Feature
> Reporter: Ryan Fu
> Priority: Major
>
> Add a strategy where if a function has ordinary function syntax and we don't
> recognize it we assume that it can take any argument types and returns a
> result of unknown type.
> We will still need to change the parser to handle functions with non-standard
> syntax (e.g. DATEADD). And it's a good idea to explicitly add commonly used
> non-standard functions (e.g. MD5, CONCAT).”
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