Ryan Fu created CALCITE-3323:
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Summary: 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
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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