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Class ObjectIdentifier {
	Optional<String> catalogName;

	Optional<String> databaseName;

	String objectName;
}

/**
 * Resolves a function. ObjectIdentifer should either contain both catalog and database names, or neither of them.
 *
 * @param oi object identifier of function
 * @return An optional result of FunctionLookup
 */
public Optional<FunctionLookup.Result> lookupFunction(ObjectIdentifier oi);