行压缩要求创建一个词典，它存储重复的模式或条目与数字键之间的映射。
Row compression requires the creation of a dictionary which stores a mapping between repetitive patterns or entries and numeric keys.
这种方法对于压缩非常有用，因为它往往容易压缩拥有多行重复字符的字符串。
This approach is useful for compression because it tends to be easy to compress a string that has runs of repeated characters.
实现方法是创建一个压缩的符号字典，取代行级重复数据模式。
It does this by creating a compression dictionary of symbols which replace repeating data patterns at the row level.
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