presto-hive/src/main/java/io/prestosql/plugin/hive/metastore/StorageFormat.java/StorageFormat/getInputFormat
class StorageFormat:    public String getInputFormat()
    {
        if (inputFormat == null) {
            throw new PrestoException(HIVE_UNSUPPORTED_FORMAT, "InputFormat is not present in StorageFormat");
        }
        return inputFormat;
    }