presto-parser/src/main/java/io/prestosql/sql/parser/SqlParser.java/PostProcessor/exitQuotedIdentifier
class PostProcessor:        @Override
        public void exitQuotedIdentifier(SqlBaseParser.QuotedIdentifierContext context)
        {
            Token token = context.QUOTED_IDENTIFIER().getSymbol();
            if (token.getText().length() == 2) { // empty identifier
                throw new ParsingException("Zero-length delimited identifier not allowed", null, token.getLine(), token.getCharPositionInLine());
            }
        }