presto-spi/src/main/java/io/prestosql/spi/connector/SchemaTablePrefix.java/SchemaTablePrefix/toOptionalSchemaTableName
class SchemaTablePrefix:    public Optional<SchemaTableName> toOptionalSchemaTableName()
    {
        if (schemaName.isPresent() && tableName.isPresent()) {
            return Optional.of(new SchemaTableName(schemaName.get(), tableName.get()));
        }
        return Optional.empty();
    }