public AstNode handleUnknownToken( DdlTokenStream tokens,
                                       String tokenValue ) throws ParsingException {
        assert tokens != null;
        assert tokenValue != null;
        // DEFAULT IMPLEMENTATION DOES NOTHING
        return null;
    }
public AstNode handleUnknownToken ( DdlTokenStream tokens , String tokenValue ) throws ParsingException { assert tokens != null ; assert tokenValue != null ; return null ; }
Utility method subclasses can override to check unknown tokens and perform additional node manipulation. Example would be
in Oracle dialect for CREATE FUNCTION statements that can end with an '/' character because statement can contain multiple
statements.

@param tokens the {@link DdlTokenStream} representing the tokenized DDL content; may not be null
@param tokenValue the string value of the unknown token; never null
@return the new node
@throws ParsingException