Null and default value Compression (V8 GA) : Compression for null, zero length data in variable length columns and system default value.
null值和缺省值压缩(V 8GA)：对变长列中的零长度空数据和系统缺省值进行压缩。
Without value compression, NULL values are stored with the data type inherent fixed size, which is typically larger than the three bytes.
如果不使用值压缩，则null值以数据类型固有的固定大小存储，这通常大于3个字节。
NULL values are stored with only three bytes, if value compression is active. You can expect space savings especially for numeric values.
如果激活值压缩，则null值的存储只需3个字节。
Enabling value compression allows for no disk storage to be consumed by NULL values, zero length data in variable length columns and system default values.
数值压缩不为空值、可变长度列中的零长度数据和系统默认值提供磁盘空间。
Enabling value compression allows for no disk storage to be consumed by NULL values, zero length data in variable length columns and system default values.
数值压缩不为空值、可变长度列中的零长度数据和系统默认值提供磁盘空间。
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