presto-main/src/main/java/io/prestosql/sql/rewrite/ShowQueriesRewrite.java/Visitor/toQualifiedName
class Visitor:        private static String toQualifiedName(Object objectName, Optional<String> columnName)
        {
            return columnName.map(s -> format("column %s of table %s", s, objectName))
                    .orElseGet(() -> "table " + objectName);
        }