presto-jdbc/src/main/java/io/prestosql/jdbc/ConnectionProperties.java/ConnectionProperties/parseExtraCredentials
class ConnectionProperties:        public static Map<String, String> parseExtraCredentials(String extraCredentialString)
        {
            return Splitter.on(';').splitToList(extraCredentialString).stream()
                    .map(ExtraCredentials::parseSingleCredential)
                    .collect(toImmutableMap(entry -> entry.get(0), entry -> entry.get(1)));
        }