presto-cli/src/main/java/io/prestosql/cli/ClientOptions.java/ClientOptions/parseClientTags
class ClientOptions:    public static Set<String> parseClientTags(String clientTagsString)
    {
        Splitter splitter = Splitter.on(',').trimResults().omitEmptyStrings();
        return ImmutableSet.copyOf(splitter.split(nullToEmpty(clientTagsString)));
    }