private ColumnFamilyOptions createColumnFamilyOptions() {
        final BlockBasedTableConfig tConfig = StorageOptionsFactory
                .getRocksDBTableFormatConfig(getRocksDBGroup(), RocksDBLogStorage.class);
        return StorageOptionsFactory
                .getRocksDBColumnFamilyOptions(getRocksDBGroup(), RocksDBLogStorage.class) //
                .useFixedLengthPrefixExtractor(8) //
                .setTableFormatConfig(tConfig) //
                .setMergeOperator(new StringAppendOperator());
    }
An empty write context
@author boyan(boyan@antfin.com)
jraft-core/src/main/java/com/alipay/sofa/jraft/storage/impl/RocksDBLogStorage.java