presto-spi/src/main/java/io/prestosql/spi/connector/SchemaTablePrefix.java/SchemaTablePrefix/SchemaTablePrefix
class SchemaTablePrefix:    public SchemaTablePrefix(String schemaName, String tableName)
    {
        this.schemaName = Optional.of(checkNotEmpty(schemaName, "schemaName"));
        this.tableName = Optional.of(checkNotEmpty(tableName, "tableName"));
    }